Here's the most detailed image yet of the Medusa Nebula. The image foreshadows the final fate of our sun, which will eventually become an object of this kind.
This galaxy is very distant. It shines with a luminosity of some 300 trillion suns. It's one of a new class of objects discovered via NASA's WISE mission.
In close-up images via the orbiting Rosetta spacecraft, the rock looks poised like a ballerina, with only a tiny fraction of its surface touching the ground.
The sky's two brightest planets are getting ready for a spectacular conjunction in late June and early July. Start watching them now! Charts and info here.
On Earth, a fast runner takes a few hours to complete a marathon. On Mars, it took the Opportunity rover 11 years. New short video on Opportunity's marathon trek.
Astronomers at Keck Observatory in Hawaii have found a quartet of quasars, embedded in a giant nebula of cool, dense gas. The odds of four of them being so closely packed purely by chance is about 1 in 10 million.