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The Bad Astronomer (563217) writes "The Mars Reconnaissance Orbiter spotted a new crater on the surface of Mars, and, using before-and-after pictures, the impact date has been nailed down to less than a day — it happened on or about March 27, 2012. The crater is 50 meters or so in size, and surrounded by smaller craters that may have been caused by smaller impacts due to the incoming meteoroid breaking up. Several landslides were spotted in the area as well, possibly due to the shock wave of the impact." top
Astronomers determine the length of day of an exoplanet
The Bad Astronomer (563217) writes "Astronomers have just announced that the exoplanet Beta Pic b — a 10-Jupiter-mass world 60 light years away -— rotates in about 8 hours. Using a high-resolution spectrometer and exploiting the Doppler shift of light seen as the planet spins, they measured its rotation velocity as 28,000 mph. Making reasonable assumptions about the planet's size, that gives the length of its day. This is the first time such a measurement has been achieved for an exoplanet." top
Astronomer discovers nearby brown dwarf literally as cold as ice
The Bad Astronomer (563217) writes "Astronomers have announced the discovery of Kepler-186f, a very nearly Earth-sized planet in its star's habitable zone. The planet is the fifth in a system of five orbiting a red dwarf star 500 light years away, and is located in the region where liquid water could exist on its surface. It's not know if this planet is Earth-like — that is, with water and air and the potential for life — but it's the closest we've yet seen where one could be like our own planet." top
Object seen in skydiver's helmetcam unlikely to be a meteorite
The Bad Astronomer (563217) writes "A new and potentially bright supernova was just discovered in the nearby galaxy M82. This is a Type Ia supernova, the catastrophic explosion of a white dwarf. It appears to be on the rise, and may have been caught as much as two weeks before peak brightness. It's currently already brighter than magnitude 12, and may get to mag 8, easy to see in small telescopes. The galaxy is less than 12 million light years away, so this may become one of the best-studied supernovae in recent times. Type Ia supernovae are used to measure dark energy, so seeing one nearby is a huge boon to astronomy." top
The Bad Astronomer (563217) writes "The Gemini Planet Imager is a camera that is designed to take direct photos of exoplanets, alien worlds orbiting other stars. In a test run last November it spotted the exoplanet Beta Pictoris b, a dusty ring around a nearby star, and even snapped a portrait of Jupiter's moon Europa. Up to now, only about a dozen exoplanets have been directly imaged; GPI is expected to find dozens more in the next few years." top
How astronauts took the most important photo in space history
The Bad Astronomer (563217) writes "Using data from the Feb. 15, 2013 asteroid impact over Russia, scientists have determined that we may be hit by objects in this size range (10 — 50 meters across) more often than we previously thought, something like once every 20 years. They also found the Chelyabinsk asteroid was likely a single rock about 19 meters (60 feet) across, had a mass of 12,000 tons, and was criss-crossed with internal fractures which aided in its breakup as it rammed through the Earth's atmosphere." top
One in five Sun-like stars may have an Earth-like planet
The Bad Astronomer (563217) writes "A new study, looking at over 40,000 stars viewed by the Kepler spacecraft, indicates that 22% of stars like the Sun should have Earth-like planets orbiting them — planets that are similar in size to our home world and with a surface temperature hospitable for liquid water. There are some caveats (they don't include atmospheric issues like the greenhouse effect, which may reduce the overall number, or at cooler stars where there may be many more such planets) but their numbers indicate there could be several billion planets similar to Earth in the Milky Way alone." top
No, the Earth (almost certainly) won't be hit by an asteroid in 2032
The Bad Astronomer (563217) writes "Last week, astronomers discovered 2013 TV135, a 400-meter wide asteroid that will swing by the Earth in 2032. The odds of an impact at that time are incredibly low — in fact, the chance it will glide safely past us is 99.99998%! But that hasn't stopped some venues from playing up the apocalypse angle. Bottom line: we do not have a good orbit for this rock yet, and as observations get better the chance of an impact will certainly drop. We can breathe easy over this particular asteroid." top
The Bad Astronomer (563217) writes "On Oct. 10, 2013, the Cassini spacecraft took a series of wide-angle pictures of Saturn from well above the plane of the rings. Croatian software developer and amateur astronomical image processor Gordan Ugarkovic assembled them into a stunning mosaic (mirrored on Flickr), showing the planet from a high angle not usually seen. There's a lot to see in this image, including the rings (and the gaps therein), moons, and the planet itself, including the remnants of a monstrous northern hemisphere storm that kicked off in 2010. It's truly wondrous." top
Russian missile test seen and photographed by ISS astronauts
The Bad Astronomer (563217) writes "It sounds like a scene from "Gravity": Astronauts aboard the International Space Station Thursday saw a weird, glowing cloud of light in the distance, most likely caused by a fuel dump or leaking fuel from a Russian missile launch. The extended life of a Topol missile was being tested in a ballistic launch to a test target in Kazakhstan, and the astronauts were able to take pictures of both the launch vapor trail and the glowing cloud. This event is similar to the eerie spiral lights seen over Norway in 2009 caused by a Russian missile launch as well." top
Can a 4K TV fool people into thinking they're about to get hit by an asteroid?
The Bad Astronomer (563217) writes "A thousand years ago, the light from the explosion of a massive star reached the Earth. We now call this supernova remnant the Crab Nebula, and a new image of the Crab taken by astronomer Adam Block shows the physical expansion of the debris, made obvious in a short video comparing his 2012 observations with some taken in 1999. The outward motion of filaments and knots in the material can be easily traced even over this relatively short time baseline." top
Lowest mass exoplanet ever directly imaged. Probably.
The Bad Astronomer (563217) writes "Astronomers announced today that they have taken a direct image of the lowest mass exoplanet ever seen. HD 95086 b has a mass about 4 — 5 times that of Jupiter, and orbits a star 300 light years away that is slightly more massive and hotter than the Sun. The planet is not 100% confirmed, but it appears very likely to be real. If so, it's a hot gas giant, still cooling from its formation less than 20 million years ago. The picture, taken in the infrared, clearly shows the planet, making it one of fewer than a dozen such planets seen in actual telescopic images." top
Missile test creates huge expanding halo of light over Hawaii