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.

Nevada earthquake swarm continues

The swarm began on July 12 and has increased in intensity over the past several days.

Video: Predator X, most powerful marine reptile ever

This deadly hunter had a skull twice the size of a Tyrannosaurus rex's, and a bite force unmatched by anything in the Jurassic seas. Cool video!

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.

Watch the pulse of New York City, measured in tweets

Scientists observe the daily heartbeat of different areas of New York City, through the lens of Twitter.

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.

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!

Cool facts about your biological clock

Feeling tired after turning the clock back? That's because the internal clock that controls your circadian rhythms needs time to adjust.