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First Photos of the Reentry of the ATV "Jules Verne"

kdawson posted more than 5 years ago | from the down-in-flames-seventy-five-km-up dept.

Space 87

White Yeti writes with news of the reentry breakup of the ESA's Automated Transfer Vehicle. All went as planned, and the ESA blog has preliminary photos. An international team of observers, in two aircraft south of Tahiti, saw a series of explosions and over a hundred small pieces of debris. Observations were mostly made using optical cameras and spectrographs. The two images on the ESA site are low-res samples, so we should get more spectacular images soon.

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87 comments

Camera phone funding (3, Funny)

MosesJones (55544) | more than 5 years ago | (#25202535)

this [esa.int] is the "Hi res" 28k JPG image on the site. Anyone else get the feeling that they rushed up there to watch it and then someone said "I thought you said you'd bring the cameras" so it was then out with the mobile phones.

The only real surprise is that these clips didn't hit Youtube first with a Tramps "Disco Inferno" sound track. Very cool stuff and it practically demands HD for a fireworks display with a billion dollar budget

Re:Camera phone funding (3, Insightful)

4D6963 (933028) | more than 5 years ago | (#25202547)

Maybe it's because they had to huge use zooms since you know, the action took place quite a few tens (probably more than a hundred) kilometres away?

Re:Camera phone funding (0, Offtopic)

Anonymous Coward | more than 5 years ago | (#25202735)

Back in my day, we didn't have fancy pictures to goatse people with - we had to stretch out our own assholes! Now get off my lawn you damn spoiled brats!

--Sen. John McCain

Re:Camera phone funding (1, Offtopic)

4D6963 (933028) | more than 5 years ago | (#25202857)

Ha! So you had assholes! Back in my day, we had to sharpen wooden rods against rocks first and then sit on them!

Re:Camera phone funding (3, Insightful)

Renegade Lisp (315687) | more than 5 years ago | (#25202573)

this [esa.int] is the "Hi res" 28k JPG image on the site. Anyone else get the feeling that they rushed up there to watch it and then someone said "I thought you said you'd bring the cameras" so it was then out with the mobile phones.

Nice speculation, but the image you refer to is probably cut out from a much larger raw image. The URL has something about "800mm" in the name, which probably refers to an already somewhat decent telephoto lens having been in use. Definitely not your mobile phone!

Re:Camera phone funding (2, Informative)

ozbird (127571) | more than 5 years ago | (#25204267)

The EXIF data says it was taken with a Nikon D700 DSLR and a 20mm lens.

A wide-angle 12.1 Mpixel image taken with a diffraction grating and cropped to 778x500 pixels would explain the image quality.

Re:Camera phone funding (1)

Renegade Lisp (315687) | more than 5 years ago | (#25205115)

The EXIF data says it was taken with a Nikon D700 DSLR and a 20mm lens. A wide-angle 12.1 Mpixel image taken with a diffraction grating and cropped to 778x500 pixels would explain the image quality.

Wow.

Re:Camera phone funding (0)

Anonymous Coward | more than 5 years ago | (#25213921)

I verified the EXIF data, but it is wrong. Likely because the 800mm lens was incorrectly reporting the focal length to the camera.

Going directly to the re-entry observation team information [seti.org] shows that it was, in fact, a 800mm lens.

The word "Kitting" in the filename matches with a researcher (Chris Kitting) who was scheduled to use a D700 with a 800mm lens to track the re-entry.

Re:Camera phone funding (1)

Levvie (680828) | more than 5 years ago | (#25202669)

Perhaps esa isn't as media-oriented as one would expect from a space agency. I guess the tight budget (compared to nasa) makes esa more discrete in it's media-machine.

Re:Camera phone funding (1)

NeoTron (6020) | more than 5 years ago | (#25202839)

The video is up on the site now and is eerily beautiful to watch.

Though I can't help but think: what a waste of a valuable resource! If they sent up additional fuel for it, it could be re-used
again and again - not to mention - why destroy the solar cells? Is it out-with the bounds of possibility to re-use the ATV
(by refueling it) or even to make it recyclable (remove solar cells before burning the rest of the ATV up)?

I realise they used it to also burn up a load of waste from the ISS, but really, what makes it so worthless that they
don't want to keep using it?

Re:Camera phone funding (4, Informative)

meringuoid (568297) | more than 5 years ago | (#25203037)

If they sent up additional fuel for it, it could be re-used again and again

For what? Its primary mission is to deliver supplies from Earth. Oxygen, water, food, fuel. While docked it acts pretty much as a walk-in wardrobe. Once its supplies are exhausted there's no further use for it; they load it up with rubbish and send it off to burn up. Then another one gets launched.

It would probably be possible to redesign the ATV with a heatshield to allow it to come home intact. But that adds a lot of weight and drastically reduces its capacity as a cargo carrier; you'd only do that if you wanted to use it to carry human crews. Maybe that'll be done some day, but not right now.

The only other use for the ATV while in orbit is for station-keeping. It can boost the Station's orbit, and some day an ATV may be given the mission of de-orbiting the entire structure. But there's no sense sending up more fuel to allow the ATV to continue working as a tugboat - that fuel would be delivered by, er, another ATV. So you might as well let that do the job.

If there were other stations in near-Earth space, then keeping a spare ATV in orbit might make sense. It could ship equipment and perhaps crews between them. But right now there's nowhere to go from the Station except for back to Earth.

Re:Camera phone funding (1)

NeoTron (6020) | more than 5 years ago | (#25203487)

Good reply - I wasn't criticising the burn up, only asking if more use of things such as the solar panels could be made, and I fully understand the reason why they burn the thing up in the Earth's atmosphere after its primary purpose has completed. ESA, btw, are in fact thinking seriously about producing a version of the ATV which could carry crew to the ISS.

Re:Camera phone funding (1)

oliderid (710055) | more than 5 years ago | (#25204021)

Looks like the partnership they had in mind with Russia has been jeopardized by the last Georgian-Russian Skirmish and an overall feeling concerning Russia (Lately a dispute with the Czcech Republic).

http://science.slashdot.org/article.pl?sid=08/07/23/1319205 [slashdot.org]

ATV was clearly an outsider compared to the ESA-Russian program...Now this is totally different. ESA wants to be independent as far as I understand.

Re:Camera phone funding (1)

hcdejong (561314) | more than 5 years ago | (#25203657)

Well, they could leave it docked to the ISS. Extra space always comes in handy, and the ATV's solar panels are useful too. They'd have to add a second airlock so the modules can be daisychained, though.

Re:Camera phone funding (1)

Cormacus (976625) | more than 5 years ago | (#25204675)

I came here to say this. I'd mod you up if I had the points, but I don't (so I'm posting)

Re:Camera phone funding (1)

MightyYar (622222) | more than 5 years ago | (#25204927)

Extra space always comes in handy

Don't they fill it with trash before jettisoning it?

Re:Camera phone funding (1)

drsquare (530038) | more than 5 years ago | (#25206975)

Then it would be more weight added to the station, and more fuel needed to correct its orbit.

Re:Camera phone funding (0)

Anonymous Coward | more than 5 years ago | (#25207161)

Space has very marginal utility other than crew comfort, and that extra space comes at a cost of extra drag and extra mass that needs reboost, and each additional seal means added leakage.

Actually, the ATV already has a tunnel through the service section, so a hatch can be added (with a minor mass penalty) and modules daisy chained. ESA has a ATV evolution program that has identified that as a potentially useful feature. They were thinking more along the lines of independent mini space stations, however.

Re:Camera phone funding (1)

sjames (1099) | more than 5 years ago | (#25211749)

That, and as NASA discovered, re-usability in practice costs more than burning it up and building a new one, no matter how counter-intuitive that may be.

Even when humans are to be on board (naturally requiring recoverability), the costs to clean it up, refurbish and re-test to a human rating is more than making a new one.

Intentional Break-Up (5, Informative)

Renegade Lisp (315687) | more than 5 years ago | (#25202537)

I guess the summary could have been clearer about this being an intentional breakup during re-entry. The craft is designed to be destroyed after use.

Re:Intentional Break-Up (0)

Anonymous Coward | more than 5 years ago | (#25203141)

The craft is designed to be destroyed after use.

Kind of like an empty beer can and my iron grip?

I saw them (-1, Troll)

Anonymous Coward | more than 5 years ago | (#25202539)

But when Jesus mated with a Tyrannisorus and I was conceived approximately 60 billion years ago, this created GOD so whatever you say is still GAY.

Question about atmospheric friction (3, Interesting)

Viol8 (599362) | more than 5 years ago | (#25202571)

At what speed do you have to travel in the atmosphere before the cooling effect of air rushing past is overtaken by the friction effect and you start heating up again? I remember reading that concorde used to heat up on the outside but subsonic airliners don't. Does it have anything to do with the speed of sound?

Re:Question about atmospheric friction (2, Insightful)

Swizec (978239) | more than 5 years ago | (#25202585)

Sounds logical that it'd be about the speed of sound, it did used to be called "the sound wall/barrier" which, imho, likens the experience somewhat to flying through, well, a wall.

Walls tend to create a lot of friction when you're trying to fly through them.

Re:Question about atmospheric friction (-1, Troll)

Anonymous Coward | more than 5 years ago | (#25202611)

lern2aerodynamics, faggot

Re:Question about atmospheric friction (5, Informative)

damburger (981828) | more than 5 years ago | (#25202983)

Logical and correct, although supersonic heating has nothing to do with friction.

Something moving through air pushes that air out of the way. At subsonic speeds (i.e. below the maximum speed the air as a fluid can move) this carries heat away from the aircraft. At supersonic speeds, the air simply cannot get out of the way quick enough, so piles up against the fuselage. This compression (not friction) creates heat.

Re:Question about atmospheric friction (0)

Anonymous Coward | more than 5 years ago | (#25203333)

sorry. pre-first coffee, i clicked to mod the parent "Funny" instead of "Informative"! D'oh! :)

good post by damburger.

Re:Question about atmospheric friction (1)

Iamthecheese (1264298) | more than 5 years ago | (#25202619)

And can anyone tell me how it was designed not to fall in one big lump?

Re:Question about atmospheric friction (2, Interesting)

juletre (739996) | more than 5 years ago | (#25202641)

The Concorde was a foot or two wider during flight. A pilot once put his hat between two cabinets/shelves/storage units (can't remember) during flight. When they landed and he wanted his hat back, it was so squeezed in between the shelves it was impossible. It had to be removed on the next flight.

According to Top Gear's Jeremy Clarkson, at least.

Concorde widens during flight (3, Interesting)

juletre (739996) | more than 5 years ago | (#25202701)

I'll reply to myself with a link [wordpress.com] , after I did some googling. It contains a picture of the hat-episode. (search in page for "hat in the seam")

Re:Concorde widens during flight (2, Informative)

Richard_at_work (517087) | more than 5 years ago | (#25202755)

From that link:

As an attraction, there are only 5 of these British Airways aircraft in the world (in fact the comment was made that a B.A. crew who toured the facility had never been on the Concorde before) so to have this here in Barbados can only be a positive for our tourism product.

There are actually 7 BA Concordes (G-BOAA to G-BOAG) and 7 Air France Concordes (F-BTSC, F-BVFA to F-BVFD, F-BTSD and F-BVFF). There are also 6 development aircraft. All BA Concordes are on show, and 5 of the seven AF Concordes are on show (one is in storage, and one crashed).

Considering that BAs fleet consists of over two hundred aircraft, and Concorde was considered 'pick of the crop', its not really surprising that a particular BA crew had never been on her.

Re:Question about atmospheric friction (3, Interesting)

Richard_at_work (517087) | more than 5 years ago | (#25202745)

Wrong dimension - Concorde did expand, but lengthways (not to say it didnt expand widthways, it just didn't do it noticably).

The flight engineers cap story is real - during the last flight of each Concorde at their retirement, each flight engineer placed his cap in the space between their console and the rear compartment bulkhead. The caps can be seen to this day, stuck there.

Re:Question about atmospheric friction (5, Interesting)

Anonymous Coward | more than 5 years ago | (#25202899)

Another example is the SR71 "Blackbird". It was designed so that all parts would fit perfectly only when it was very hot during flight. And since it lacked a heat resistant fuel containment seal, it would leak fuel in the ground until it took off, flew for some time to heat up and then it had to be refueled on air.

Re:Question about atmospheric friction (5, Informative)

delt0r (999393) | more than 5 years ago | (#25202645)

It depends on the design/shape of the object. But generally a bit above mach 1. A blunt reentry object will cause a very strong shock wave at the front of the craft and will cause much more heating than a sharp object. Once you hit about Mach 5 IIRC the heating issue is getting quite serious. Reentry is about >7000m/s (speed of sound at that height does not really make sense) and causes extreme heating no matter what the design. For comparison Mach 1 is about 350 m/s at sea level.

Re:Question about atmospheric friction (-1, Redundant)

Anonymous Coward | more than 5 years ago | (#25203067)

Actually an object will heat up less on reentry if it is blunt because there will be a bigger cushion of air between the aircraft and the shock front. [wikipedia.org]

Re:Question about atmospheric friction (2, Informative)

unchiujar (1030510) | more than 5 years ago | (#25203417)

Actually an object will heat up less on reentry if it is blunt because there will be a bigger cushion of air between the aircraft and the shock front. [wikipedia.org] . Early ballistic missiles had a round (blunt) tip made of plywood which chars slowly in order to prevent the destruction of the payload on reentry.

Reposting this (posted as AC) because I can't stand someone being wrong on the internet. :)

Re:Question about atmospheric friction (1)

delt0r (999393) | more than 5 years ago | (#25203981)

In fact the temperature is higher but reentry is much faster and hence there is less time for the hot reentry air to deposit this heat into the craft. So a capsule needs to handle higher temperatures (hence ablative heat sheilds) for less time than say the space shuttle. But the total amount of heat energy is less. This of course does not work for hypersonic craft as they don't want to slow down, while the whole point of reentry is to slow down without using rocket fuel.

Re:Question about atmospheric friction (1)

codewarren (927270) | more than 5 years ago | (#25203441)

"Air friction" does not cause the heat up during reentry - that's a myth. http://www.space.com/scienceastronomy/top5_myths_020903-4.html [space.com] It is the air pressure created in front of the object as it pushes against the atmosphere.

Re:Question about atmospheric friction (2, Interesting)

mbone (558574) | more than 5 years ago | (#25204239)

Sorry, I am going to call BS on this.

Friction is not a basic concept - it has to do with the behavior of large number of atoms. It is thus basically a thermodynamic concept - ordered motion gets converted into heat via turbulence.

So, there can be fluid friction, even fluid-fluid friction (a useful concept in meteorology) and when the fluids are supersonic, shock effects become important. There is no reason you can't call that friction too.

In modeling real systems, you can almost never estimate friction from first principles. In many real systems, friction is a "bucket" for a host of complicated small scale effects that get lumped into some large "frictional" drag or heating model, typically depending on some power of the fluid velocity, which is exactly how supersonic friction is handled (at least to first order). So, putting shock effects into the friction bucket is a useful concept, which means it is good physics.

Re:Question about atmospheric friction (1)

codewarren (927270) | more than 5 years ago | (#25204353)

The picture "air friction" paints is that as air rushes past a fast moving object, it grates against it and heats it up. (Actually, the opposite tends to happen.) The heat that accumulates on these objects happens in front of them as they compress the air ahead of them. All I'm saying is that the idea that air rushing past something causes it to heat up is is misunderstanding

Re:Question about atmospheric friction (3, Informative)

mbone (558574) | more than 5 years ago | (#25203593)

Here is a simple way to think about it -

The kinetic energy of your (or an airplane's) motion gets converted into friction through turbulence and shock effects. Heat is just the velocity of atoms bouncing off each other, and the sound speed depends on the velocity of those atoms, and thus on the temperature.

In an ideal gas, the absolute temperature is a measure of the energy, and thus is a constant times the square of the rms gas velocity. By the same consideration, for an idea gas, the speed of sound is (a constant) times the rms particle velocity. (That constant is the square root of the (adiabatic index /3), or about 0.7 for a monatomic gas.)

So, you are correct. Speeds much slower than the speed of sound will generally be associated with small amounts of heating, which may be negligible compared to other effects, such as cooling caused by the air flow, while speeds much higher than the sound speed will generally involve heating to something much above the ambient temperature. (Generally, of course, airplanes are designed not to convert all of their kinetic energy into turbulence, but during re-entry, that is done pretty effectively.)

The real gases in air are very non-ideal in the temperatures and pressures in re-entry so this simple theory is not realistic for speeds much above Mach 3 or so. It turns out that an engineer's rule of thumb is that the temperature in K is roughly equal to the speed in meters / sec, based on more realistic models of specific heat in the ionized plasma formed at these high speeds.

Link to video (2, Informative)

Aggrajag (716041) | more than 5 years ago | (#25202643)

Why explode? (1, Funny)

juletre (739996) | more than 5 years ago | (#25202653)

Why was an explosion a success? I would think getting it the ground in one piece would be better, but what do I know.

Re:Why explode? (3, Insightful)

totally bogus dude (1040246) | more than 5 years ago | (#25202673)

It was designed to break up on re-entry, so if it made it to the ground in one piece some people would have been very angry.

Re:Why explode? (1)

Goffee71 (628501) | more than 5 years ago | (#25202687)

That's the plan for future versions, assuming lots of money is invested but this model allows us to brain more skipjack tuna!

Re:Why explode? (5, Informative)

meringuoid (568297) | more than 5 years ago | (#25202717)

Why was an explosion a success? I would think getting it the ground in one piece would be better, but what do I know.

The Jules Verne was carrying nothing but rubbish; it was intentionally burned up on re-entry. It's just a supply ship: it carries stuff up to the Station, serves as a little extra habitable volume while docked (I hear some of the crew have found it a very quiet place and have pressed it into service as sleeping quarters), and finally carries away waste and junk and incinerates the lot in the atmosphere.

With the uncertainty over the future of the American manned capability, there is now talk of developing an upgraded ATV which would include a re-entry module, and make ATV into a complete manned spaceflight system. Mind you, there's always talk; ESA headquarters is full of extremely expensive paperwork relating to manned spacecraft that never flew. At least in this case there's something concrete to point at, though.

Re:Why explode? (2, Insightful)

damburger (981828) | more than 5 years ago | (#25203045)

I've said it before and I will say it again: The UK is the weak link. All manned programmes in Europe have received enough backing from France and Germany that they would've succeeded if we had the vision to chip in our share.

The Italians, developing their new Vega launch vehicle, are demonstrating more aerospace competence than we are - and no offence meant to Italians but that is shameful for a country that considers itself the economic success story of the continent.

I blame Thatcher. Her restructuring of the economy to make it based almost solely on finance has a) created this damned economic mess we are in now and b) left us severally lacking in high tech fields such as aerospace. In the 1970s we cooperated with France on aerospace projects such as Concorde and the ill-fated Europa rocket, but now we can only cooperate with them as a very junior partner on things such as the new Airbus.

Re:Why explode? (1)

oliderid (710055) | more than 5 years ago | (#25204069)

Well I agree that The UK has never been the best of ESA partners concerning funds...But the last serious ESA program I remember (Hermes) http://en.wikipedia.org/wiki/Hermes_(shuttle) [wikipedia.org] has been blocked by Germany if I remember well. It was immediatly after the fall of the berlin wall and they needed all the money they had to finance the East-Germany reconstruction.

Re:Why explode? (1)

drsquare (530038) | more than 5 years ago | (#25207121)

All manned programmes in Europe have received enough backing from France and Germany that they would've succeeded if we had the vision to chip in our share.

How are we supposed to afford it? We have benefits to pay to layabouts, public-sector pen-pushers' unfunded pensions to pay, not to mention all those PFI contracts for shit we don't need. And the Olympics...

Re:Why explode? (1)

damburger (981828) | more than 5 years ago | (#25211589)

Anyone who thinks 'layabouts' are the chief cause of British economic woes reveals their far right political orientation. Benefit fraud costs the taxpayer about 200 times less than corporate fraud, and the vast majority of social funding goes on pensions not unemployment benefits.

Re:Why explode? (1)

drsquare (530038) | more than 5 years ago | (#25214985)

Do the benefit fraud figures count all the people who are fully able to work but can't be bothered? Or the people who have kids despite being unable to afford them and so rely on benefits?

Re:Why explode? (2, Insightful)

MichaelSmith (789609) | more than 5 years ago | (#25203167)

With the uncertainty over the future of the American manned capability, there is now talk of developing an upgraded ATV which would include a re-entry module, and make ATV into a complete manned spaceflight system.

It might be handy to be able to use the ATV as an emergency return vehicle, so perhaps a heat shield would not be so bad an idea on a supply ship.

Re:Why explode? (2, Interesting)

mbone (558574) | more than 5 years ago | (#25203251)

... there is now talk of developing an upgraded ATV which would include a re-entry module, and make ATV into a complete manned spaceflight system.

There is pretty serious talk - they put together a model they showed off in Berlin [bbc.co.uk] .

They would be crazy not to pursue this.

Re:Why explode? (0)

Anonymous Coward | more than 5 years ago | (#25203735)

It's just a supply ship: it carries stuff up to the Station, serves as a little extra habitable volume while docked (I hear some of the crew have found it a very quiet place and have pressed it into service as sleeping quarters),

I just hope nobody was still asleep in it when they dropped it off.

Step One (1)

Leuf (918654) | more than 5 years ago | (#25208679)

At least in this case there's something concrete to point at

Step One: Stop making the capsule out of concrete.

Re:Why explode? (1)

damburger (981828) | more than 5 years ago | (#25203011)

Its a disposable cargo carrier. There are plans to allow it to return to Earth in one piece, which are hopefully going to lead to the development of a manned version of it as proposed by the Germans.

Lucky their ATV isn't as shoddy as their Web site (0)

Anonymous Coward | more than 5 years ago | (#25202705)

FFS! It's 2008 and the ESA has a Web site that uses tables for layout? But wait, before you mod me troll, it gets worse:

<script type="text/vbscript" language="vbscript">

on error resume next
[...]

I do hope that sort of thing wasn't in the software controlling the ATV!

I'm curious... (3, Interesting)

apodyopsis (1048476) | more than 5 years ago | (#25202739)

I had a hunt on the net - but did not find anything.

did *anybody* ever get hit by a falling satellite?

or radiation damage?

or property damage?

anybody know?

Re:I'm curious... (2, Interesting)

meringuoid (568297) | more than 5 years ago | (#25202935)

Some parts of Skylab landed in inhabited parts of Australia; IIRC, an American newspaper had offered a prize for the first Skylab fragments handed in, and an enterprising citizen picked up some bits from the roof of his house and took them with him on the first flight over there.

Re:I'm curious... (1)

MichaelSmith (789609) | more than 5 years ago | (#25203177)

Some parts of Skylab landed in inhabited parts of Australia; IIRC, an American newspaper had offered a prize for the first Skylab fragments handed in, and an enterprising citizen picked up some bits from the roof of his house and took them with him on the first flight over there.

The only bits I remember were found years later on a remote cattle station. The bloke who found them tried to return them to NASA but they weren't interested.

Skylab hit a cow (2, Informative)

justthinkit (954982) | more than 5 years ago | (#25203281)

Bits of Skylab struck and killed a cow [aerospaceguide.net] .

Re:I'm curious... (1)

TorKlingberg (599697) | more than 5 years ago | (#25203155)

It is said that a cow was killed by Skylab debris, but it might be a rumor.

ATTENTION SHOPPERS! (-1, Offtopic)

Anonymous Coward | more than 5 years ago | (#25202909)

ATTENTION SHOPPERS: PAY NO ATTENTION TO THE NECROTIC DOG PENIS. I REPEAT, PAY NO ATTENTION TO THE NECROTIC DOG PENIS CURRENTLY LOOMING OUTSIDE LOT 4. CONTINUE SHOPPING BUT PLEASE ENSURE YOU LEAVE VIA AN ALTERNATIVE EXIT AS WE ARE NO LONGER ABLE TO GUARANTEE YOUR SAFETY IN LOT 4, DUE TO THE NECROTIC DOG PENIS. FOR YOUR INFORMATION, LOTS 1, 2, 3, 5 AND 6 ARE CURRENTLY FREE OF BAYING NECROTIC DOG PENIS. PAY NO ATTENTION TO THE NECROTIC DOG PENIS. THANK YOU.

Lameness filter encountered. Post aborted! Lameness filter encountered. Post aborted! Lameness filter encountered. Post aborted! Lameness filter encountered. Post aborted! Lameness filter encountered. Post aborted! Lameness filter encountered. Post aborted! Lameness filter = censorship, lameness filter = censorship, lameness filter = censorship, lameness filter = censorship, lameness filter = censorship, lameness filter = censorship.

Your comment violated the "postercomment" compression filter. Try less whitespace and/or less repetition.

So that's what it looks like... (1, Funny)

Anonymous Coward | more than 5 years ago | (#25202921)

So that's what it looks like when we bring down a goa'uld mothership... neat.

Wow ! (5, Interesting)

o'reor (581921) | more than 5 years ago | (#25202923)

The video of the re-entry [esa.int] is just beautiful !

Re:Wow ! (1)

yo303 (558777) | more than 5 years ago | (#25210661)

The video of the re-entry [esa.int] is just beautiful !

You can see the autofocus struggling about 2/3rds in.

Dude, just set it manually to infinity. If you're thinking you might need to focus somewhere closer, you've got more to worry about than getting a sharp picture.

No friction here (2, Informative)

damburger (981828) | more than 5 years ago | (#25202997)

Friction is a force between two solid surfaces. There is no friction involved in fiery atmospheric re-entry.

The heating is caused by compression. When an object travels at supersonic speeds, it pushes air ahead of it faster than the air in front of that air can get out of the way. This compresses it and thus heats it.

Re:No friction here (1)

Muad'Dave (255648) | more than 5 years ago | (#25203069)

<sarcasm>Too bad we weren't notified about this effort before it happened.</sarcasm>

2008-09-26 16:04:37 The Re-Entry of ATV: One Final Experiment (Index,Space) (rejected)

Grouse, grumble.

Re:No friction here (0)

Anonymous Coward | more than 5 years ago | (#25204007)

Except when it's fluid friction. Not all of the air is compressed in front of the re-entering object. Some slips past and heat is generated by fluid friction -- not as significant as the compression heat, but not negligible either. To say there is NO friction involved in something bashing through the atmosphere at several times the speed of sound is just silly.

Re:No friction here (1)

damburger (981828) | more than 5 years ago | (#25211777)

It isn't "silly" - I am well aware of that compression isn't the only component of the thing - it is simply the best explanation for most people. The phenomenon you describe is such a tiny factor in the heating of a spacecraft re-entering the Earths atmosphere that it is pointless even mentioning it to someone who isn't specifically interesting in fluid dynamics.

As it happens, I am sufficiently interested in fluid dynamics, but when correcting the common fallacy that "friction" causes spacecraft to heat up on re-entry I don't think it matters that much.

What a drag. (0)

Anonymous Coward | more than 5 years ago | (#25265253)

Pardon my insolence, but your comprehension of drag seems to be practically Hollywoodian. Have you considered sending your resume to the producers of the "Mission to Mars" sequel?

Taking Extreme Sports to Extremes (1)

kiehlster (844523) | more than 5 years ago | (#25203187)

I can't imagine the thrill of taking an ATV into the atmosphere rather than the typical dirt track. I guess the explosions could be a little dangerous, but... oh, that's automated transfer... now you understand my pet peeve with acronyms.

This shows a failure of imagination. (2, Insightful)

mbone (558574) | more than 5 years ago | (#25203197)

This was a 16 ton, 30 meter long habitable spacecraft, used to carry supplies. The idea that there is no further use for it than to deorbit garbage is crazy. Did they offer it to any private groups (or even to the Chinese) ? If we really want to become a spacefaring civilization, we have to stop thinking in terms of billion dollar garbage runs, and start thinking in terms of what can we do with what we have.

Re:This shows a failure of imagination. (2, Interesting)

hanshotfirst (851936) | more than 5 years ago | (#25204009)

If we really want to become a spacefaring civilization, we have to stop thinking in terms of billion dollar garbage runs, and start thinking in terms of what can we do with what we have.

Of course, this is the same civilization that makes it cheaper to scrap a printer and buy a new one than replace the ink.

Re:This shows a failure of imagination. (3, Insightful)

jmichaelg (148257) | more than 5 years ago | (#25205497)

I don't doubt that there may be better uses for the craft but just how would you propose getting rid of the junk that accumulates? Remember, you have to be *positive* the junk doesn't stay in orbit so you have to substantially decelerate it somehow.

  That means some sort of rocket so either you have a "bus" that serves the function or you have a lot of little rockets slowing down the junk.

On second thought, I suppose if their was some sort of rocket engine on the space station that was designed to eject junk at high speeds, you could both speed up the space station and dispose of the junk with one pop but lacking such an engine, I'm at a loss to think of how to better dispose of junk.

Re:This shows a failure of imagination. (1)

Hells (1166547) | more than 5 years ago | (#25206067)

They should have designed the aircraft so it can be salvaged for potential parts.

Re:This shows a failure of imagination. (1)

Kagura (843695) | more than 5 years ago | (#25208843)

A souped-up artillery cannon to fire (decelerate) the trash in specially designed canister rounds would be pretty neat. It could be installed with shocks so the sudden impulse wouldn't damage any of the space station components. Although I'd imagine that rocket fuel is more efficient ounce-for-ounce than whatever gunpowder they use in an artillery cannon.

Re:This shows a failure of imagination. (0)

Anonymous Coward | more than 5 years ago | (#25206775)

Yeah right.

You know, there's tons of steel lying at the bottom of the ocean. I even heard some of those ships and subs have minimal damage. Maybe you should apply your insight on how to refurbish those. After all, swimming is much easer than flying, ain't it?

</sarcasm>

Re:This shows a failure of imagination. (1)

Josef Meixner (1020161) | more than 5 years ago | (#25207023)

The idea that there is no further use for it than to deorbit garbage is crazy.

Why? That is exactly what it was designed for. It carries supplies to the ISS, then is a bit of storage/extension to the space station and uses its fuel to lift the ISS so it doesn't fall out of orbit. When the surplus fuel is burnt, it is loaded with garbage, does two deorbit burns and enters the atmosphere. And then provides a spectacular light show.

Of what use would a space craft without fuel and loaded with garbage be to anybody? As all the things it does have to be done, I don't see where the problem is. Leaving it in orbit would just be creating dangerous space debris, so that is no option. The changes needed to make it reusable would seriously drive the price up, would have the issues the space shuttle shows (wear on material, high cost of maintenance) and would limit the loading capabilities. So to repeat, it does exactly what it was designed to do.

Re:This shows a failure of imagination. (0)

Anonymous Coward | more than 5 years ago | (#25207389)

Of course they've looked at further use for it. Nothing has so far ended up being economical except removing waste from the ISS. A major challenge with space flight is margins on everything are so tight that almost everything ends up being useful for a limited number of functions. Plus, rendezvous is not exactly a trivial task, especially at the ISS's high inclination of 51 degrees, and technology transfer to the Chinese is an additional concern.

Re:This shows a failure of imagination. (1)

fotoguzzi (230256) | more than 5 years ago | (#25215721)

From the ESA website: The exterior of this new generation spacecraft is a cylinder, 10.3 metres long and up to 4.5 metres in diameter.

Did anyone notice the explosion... (0)

Anonymous Coward | more than 5 years ago | (#25203525)

halfway along the flightpath?

Looks too violent to be caused by friction...

I think... this was a ship brought down by a combination of black helicopters and Illuminiatii, to blame China and restart the Opium Wars. This will divert attention from our economic nightmare, and enable the Russians to attack the Latvians, thus releasing access to the Trans-Siberian Oil pipeline to Halliburton.

One of the recent Chinese astronauts was really Cheney, with a face makeover, and he released an explosive device during the spacewalk which brought down the ESA spacecraft.

It's true, I tell you! It's all in the stars!!!

All Terrain Vehicle ? (0)

Anonymous Coward | more than 5 years ago | (#25204915)

I know people do stupid things with ATV's and other recreational vehicles, but reentry to the atmosphere is going a bit far..

I wonder if it was insured by Geico, or Progressive?

Isn't this basically.... (0)

Anonymous Coward | more than 5 years ago | (#25205901)

.... aerospace grade littering?

I mean, I would get fined $1000 for tossing an empty cigarette box out the window of my car. This is several thousands of pounds of sheet metal, plastics, Kevlar, steel, whatever survives reentry which is now littering the Pacific Ocean.

Now I want NASA to go troll around in boats over the 50 square mile impact area and pick up the mess they made! ( /me wags finger in mom-like fashion. )

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