We now know more than 1,800 exoplanets - worlds orbiting distant suns - but zero exomoons. UT Arlington physicists propose a new way to search for them.
Last week, Rosetta became the first spacecraft ever to rendezvous with a comet. Now the spacecraft is in a race against time. Rosetta's next challenges, here.
Which is brighter - Perseid fireballs or a supermoon? You'll find out as the year's biggest, brightest full moon arrives as Perseid meteor shower starts to peak.
Astronomers used Hubble Space Telescope images to spot a star system that could have left behind a "zombie star" after an unusually weak supernova explosion.
Uranus - the sideways planet - has a weird spin and the strangest seasons of any of our solar system's planets. Astronomers called this week's storms "surprising."
Astrophotographer Colin Legg in Western Australia caught the August 4, 2014 occultation of Saturn by the moon. He called it "a brilliant thing to watch."