Spectacular meteor shower on Mars from Comet Siding Spring

Several craft orbiting Mars saw its aftermath. Also, after Siding Spring passed, the MAVEN mission got the first direct measurements of dust from an Oort Cloud comet!

Bright fireball seen over San Antonio, Texas

Hundreds of sky watchers in Texas reported a bright meteor or fireball Saturday night. It was said to be greenish in color and to rival the brightness of the sun!

Curious about dark matter? Three scientists answer your questions

Why do you bet on axions or WIMPs? If you find dark matter, what are the next steps? Will we need a whole new "Dark Standard Model"? What's it like searching for something you may never find?

New rocket findings might change definition of galaxies

Galaxies might not have such discreet boundaries as we imagined. Instead, they might stretch out to great distances, forming a vast, interconnected sea of stars.

Astonishing image of planet-forming disk from ALMA

It looks like an artist's illustration, but it's a real image and it lets us glimpse the process by which planets are born in orbit around their stars.

How G2 survived the black hole at our Milky Way’s heart

Astronomers watched in fascination as an object called G2 appeared to edge closer to our Milky Way's central black hole. But G2 survived!

Video: How to land on a comet

On November 12, the Rosetta spacecraft will attempt something "ridiculously difficult:" landing a probe on the surface of a speeding comet.

How a violent collision at Vesta’s pole formed equatorial grooves

Researchers used an ultra-high-speed cannon to simulate a collision on Vesta. Images taken at a million frames per second show how Vesta got its grooves.

Collect call from E.T. Do you accept the charges?

Odds are there’s intelligent life out there somewhere among the stars. Why haven’t we heard from an alien civilization? One viewpoint, in this article. What do YOU think?

Cassini captures sunglint from Titan’s seas

Here's a newly released color mosaic of Titan - taken in near-infrared part of the spectrum - showing the sun glinting off of Titan's north polar seas. Beautiful!

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