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Four potential landing sites are marked in this image.

Landing on a comet is hard: Rosetta searches for the sweet spot

The Rosetta mission has narrowed down the selection of possible landing sites to just five candidates, but it's going to be tricky to touch down.

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The Atacama Large Millimeter/submillimeter Array (ALMA) and many other telescopes on the ground and in space have been used to obtain the best view yet of a collision that took place between two galaxies when the Universe was only half its current age. The astronomers enlisted the help of a galaxy-sized magnifying glass to reveal otherwise invisible detail. These new studies of the galaxy H-ATLAS J142935.3-002836 have shown that this complex and distant object looks surprisingly like the well-known local galaxy collision, the Antennae Galaxies. In this picture you can see the foreground galaxy that is doing the lensing, which resembles how our home galaxy, the Milky Way, would appear if seen edge-on. But around this galaxy there is an almost complete ring — the smeared out image of a star-forming galaxy merger far beyond. This picture combines the views from the NASA/ESA Hubble Space Telescope and the Keck-II telescope on Hawaii (using adaptive optics).

Cosmic effort provides best view yet of distant colliding galaxies

Behold the best look yet at a massive intergalactic train wreck in progress. It's also a glimpse at what the universe looked like when it was only half its current age.

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An aurora, as seen from the International Space Station.

See what it's like to fly through an aurora in orbit

It looks like something from a '90s screensaver, but it's footage of the International Space Station flying through the northern (or maybe southern?) lights.

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SpaceX rocket explodes. ('Rockets are tricky,' says Elon Musk)

After a malfunction during a test flight, a Falcon 9 Reusable rocket built by Musk's firm explodes over McGregor, Texas.

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'Thigh bone' on Mars? NASA explains an unusual find

Space-alien theorists have gotten a thrill from a bone-like object found on Mars, but NASA has a more plausible explanation.

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Help identify these city nightscapes shot from the ISS

Over 300,000 photos of Earth at night have been snapped by astronauts aboard the International Space Station. Now, a crowdsourcing project aims to identify and geotag the spectacular shots.

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Spectacular ISS shots of cities at night (pictures)

A crowdsourcing effort is underway to catalog over 300,000 images of Earth at night taken from the International Space Station. Here's a gallery of the best shots of our planet's nocturnal side.

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Superhero Workout app: Get fit by fighting aliens

This calisthenics-based fitness app uses motion tracking to turn you into a supersoldier saving the world. In your head, anyway.

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Have you heard? Space gets loud on the latest CraveCast

They can't hear you scream in space, but that doesn't mean there are no sounds coming from the cosmos. The CraveCast crew investigates and discusses a hot new space game, a super DIY space dad and saddling up a real-life comet.

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The prototype solar panel array folded up.

Origami expert, NASA researchers fold solar arrays for space

NASA has joined forces with an origami expert to meld art and technology in the creation of foldable solar structures that could one day go into space.

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The rolling stone left an interesting trail.

Tracks on Mars? NASA spots rolling stone

A large boulder went for a tumble on Mars and is captured in a NASA photo, complete with the strange tracks it left behind.

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If anyone should possibly make contact with alien beings, it might as well be Hello Kitty.

Hello Kitty wants your space messages

Who better to deliver your greetings from space than Hello Kitty? The adorable cat happens to be on board a satellite and has been sending messages back to Earth.

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