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SpaceX To Attempt Falcon 9 Landing On Autonomous Spaceport Drone Ship

idji Re:fuel weight (81 comments)

As Elon Musk says MANY times fuel is only 10% or less of the cost of a launch, and as he says MANY times no-one would throw away a Boeing 747 after each flight as it is too expensive.
He takes extra fuel for the landing - this means he can only launch a lighter cargo, but he can one day reuse his rocket again, so it is worth it.
The last Falcon 9 flight http://en.wikipedia.org/wiki/S... did not attempt a landing because it took a cargo of 2,216 kilograms (4,885 lb). The last flight which attempted a landing http://en.wikipedia.org/wiki/F..., only had 1000 kg payload.
The http://en.wikipedia.org/wiki/F... will be able to lift up to 53,000 kg and land again because it is 3 Falcon-9s strapped together.

3 days ago
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Economists Say Newest AI Technology Destroys More Jobs Than It Creates

idji Re:This is not the problem (656 comments)

Why are you encouraging water pollution? That is part of the problem.

3 days ago
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Economists Say Newest AI Technology Destroys More Jobs Than It Creates

idji Re:This silly person has no idea what will happen. (656 comments)

I think we will experience a renaissance of personal creativity when AI automates all of the non-creative jobs. The twentieth century was an era of global businesses pushing their uniform products on mindless consumers. I would like to believe that the 21st century will be more colorful, individualized, personal and creative, with people doing interesting and satisfying work, because they are doing it for themselves and their families, not the corporate übermonster.
Life is definitely better than 100 years ago - people have better human rights, more food, better health, smaller families, and increased longevity - also in the developing world. And I think 100 years from now it can get even better, especially if renewable energy democratizes energy sources - removing the source of most global conflict of the last century, if people can get their (probably lower than today) energy needs sourced form their own creativity and ingenuity, rather than drinking energy from the corporate hosepipe as a mindless, paying consumer.

3 days ago
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Last Three Years the Quietest For Tornadoes Ever

idji Polar vortices (185 comments)

There have been recent changes in the polar vortices, but meteorologists aren't prepared to make definitive statesments until they get better long term data, http://en.wikipedia.org/wiki/P..., but it wouldn't surprise me if these vortices mess around with atmospheric energy equilibria across all the seasons.

about a week ago
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The Shale Boom Won't Stop Climate Change; It Could Make It Worse

idji Re:"Could", (390 comments)

By "western society", I think you mean the society that created REAL HEALTH PROBLEMS like aerial nuclear tests, mustard gas, smog, lead poisoning, chlorofluorocarbons, acid rain and other things that needed banning. This process is ongoing, and the benefits are for all. Go and look at asthma statistics for Los Angeles since 1970...
You can sit back smugly and wait for the millions of refugees to descend on Europe from Subsaharan Africa and Central/Southern America as their homelands become more arid, driving them north, or watch as global fishery catches dive because of eutrophication and ocean acidification.
This is no fiction - already these are burning issues in America and EU this year.

Forget your apocalyptic scenarios - there have been many environmental problems of the past that we fixed because they made people sick, and now we need to fix the environmental problems that are making people hungry and killing sealife.
Westen Society has done IMMENSE damage to the planet,eg http://en.wikipedia.org/wiki/G..., , and we need to keep finding, preventing and fixing these problems.
When talking about fracking, people almost always IGNORE the fact that they are pumping masses of http://en.wikipedia.org/wiki/L... into the ground, without taking responsibility for the consequences. Be assured that the next few generations will be cursing yours for that and filling the earth's orbital space with 300,000+ pieces of junk http://en.wikipedia.org/wiki/S....

There is no "business as usual", we all need to be acting responsibly for our own health and others.

about a week ago
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Deflating Claims That ESA Craft Has Spotted Dark Matter

idji Re:Dark matter and the sniff test (85 comments)

One of the consequences of Newton's Law of Gravity is that a spherically even distribution of matter behaves gravitationally as if it were all at the center http://en.wikipedia.org/wiki/S.... If you are INSIDE that sphere then you can IGNORE mass that is above you. Ie if you are in a hole 2000km into the earth you can ignore the outer 2000km of the earth. And so when you reach the center of the Earth you can ignore the Earth's gravity.


If you now apply this to Dark Matter and ASSUME that the Dark Matter in our part of the galaxy is evenly distributed then its gravitation effect upon is is effectively zero (or insignificant in terms of the Sun's effect on us). That is why we are unlikely to be able to measure local Dark Matter's effect on us, it is better to look outside of a Galaxy where it is less "spherical" or comparable to baryonic matter's influence
Also, since the baryonic matter INSIDE our solar system has MANY ORDERS OF MAGNITUDE of density higher than the Dark Matter INSIDE our solar system, Dark Matter is completely irrelevant for the orbits of solar planets, moons, etc..

about a week ago
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Rosetta Results: Comets "Did Not Bring Water To Earth"

idji Why does the isotope ratio of one comet matter? (135 comments)

surely the Earth has hit by so many objects with varying D/H that the D/H of each object is not important to tell us the source of water, but rather tells us of the formation environment of the object itself. I don't see how anyone could claim that such D/H comets could not seed earth. i just see a larger D/H range of the seeders.

about two weeks ago
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Aliens Are Probably Everywhere, Just Not Anywhere Nearby

idji Re:Drake is Obtuse (334 comments)

Have a look at http://en.wikipedia.org/wiki/F..., where you see that the Drake equation is a famous example of a Fermi problem, and discussion of errors in Fermi estimations. The goal is to get orders of magnitude, and Fermi problems help to understand where to go for better data, and so they are useful and practical. In this case, the Kepler mission is partly driven by the goal of improving data in the Drake equation to get better estimates.

about two weeks ago
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UK MP Says ISPs Must Take Responsibility For Movie Leaks, Sony Eyes North Korea

idji Re:So, lets say... (216 comments)

There are "should" and "could" and "cost" arguments here. Most Slashdotters say Should>Could. I am saying "could" exists and politicians play in that gray space between "could" and "should" and are willing to bend the rules to get their own gain, and spend someone else's money to make it happen. Your idealistic should>could is nice, but the political reality is they are going to get as much "could" as they can with the "cost" budget they have - and if they lose some "should" but get some votes, then they will - because we all know they are spineless parasites.

about two weeks ago
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UK MP Says ISPs Must Take Responsibility For Movie Leaks, Sony Eyes North Korea

idji Re:So, lets say... (216 comments)

Neither phone companies nor post offices can inspect every analog message coming through. but ISPs could inspect digital content, and that is the difference. You can make your analogies that ISPs are indenpendent conduits and hence not responsible for content - but you need to consider the analog/digital divide.

about two weeks ago
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Google's Project Loon Can Now Launch Up To 20 Balloons Per Day, Fly 10x Longer

idji Is this a responsible use of Helium? (116 comments)

Surely we should only be using helium in a reusable way.

about a month ago
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Comet Probe Philae To Deploy Drill As Battery Life Wanes

idji Re:Solar? (223 comments)

Europe wouldn't allow research and dev on such nuclear tech. (they asked this question in a Google hangout today)

about a month ago
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333 Km/h Rocket-Powered Bicycle Sets New Speed Record

idji Re:If I strap a rocket to my back (51 comments)

then you wouldn't really be around anymore to claim anything, would you?

about a month ago
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Pope Francis Declares Evolution and Big Bang Theory Are Right

idji Re:Tip of the iceberg (669 comments)

What a load of Mormon-like nonsense!!! They like to think of Jesus as a space traveller. You said nothing valuable here, just read your Mormon-like beliefs into the text where it suited you, and ignored everything else (like divine sea monsters in Genesis 1:21 that translators gloss over with "large sea creatures", "big fish" or "whales").

about 2 months ago
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Creationism Conference at Michigan State University Stirs Unease

idji Re:It makes you uneasy? (1007 comments)

Exactly the same thing happened at my university in 1988. This is not news. The only thing that is news is that they are still talking about Hitler after 30 years.

about 2 months ago

Submissions

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How did the Moon move so far in one day?

idji idji writes  |  more than 5 years ago

idji (984038) writes "Saturday morning I woke up at 7am and looked out my south-facing window (48N) and saw the moon BEHIND a tree. Sunday morning I woke up at 8am and looked out my south-facing window. No surprise that the Moon was there. But what blew me away was that the moon wasn't behind the tree, it was ABOVE the tree, about 8(!) moon-diameters higher in the sky. I have studied planetary science, the orbit of Mercury and can derive Kepler's 3 Laws from F=ma on the back of an envelope but I didn't have an explanation for what I saw — I skipped that observational Astronomy class at university — too much trigonometry. Orbit of the Moon didn't help me either. Can any one out there explain how the Moon was 8 diameters higher in the school AFTER 25 hours?"
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idji idji writes  |  more than 8 years ago

idji writes "Astronomers meeting in the Czech capital have voted to strip Pluto of its status as a planet. About 2,500 were in Prague for the International Astronomical Union's (IAU) general assembly. Pluto has now been demoted to a pluton — transneptunian — kuiper belt object — whatever you want to call it. http://news.bbc.co.uk/1/hi/world/5282440.stm"

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