Elliptical galaxy has spiral arms

An elliptical galaxy has spiral arms within it. The spiral arms formed shortly after a collision with another galaxy several hundred million years ago.

X-flare on sun, with more solar storms expected

A storm on the sun from Active Region 1598 produced an X-flare on the sun October 23, 2012. No auroras expected this time, though.

City lights could reveal E.T. civilization

Researchers suggest the bright lights of cities, which are visible on a planet even from space, might reveal the existence of alien life on other planets.

Bright meteor seen October 17, 2012

Many in and around San Francisco's Bay Area heard a loud boom and saw a bright meteor - a fireball - streaking across the sky on October 17, 2012.

Reddish Jovian Trojans travel in packs around the sun

WISE scientists have uncovered new clues in the ongoing mystery of the Jovian Trojans - asteroids that orbit the sun on the same path as Jupiter.

Photos from friends: The oldest moon October 14, 2012

Yay, several of you did take our challenge and spot the October 14, 2012 very old moon! Thank you, Peter Rodney Breaux, Lakshmi Ravishankar and Julie Gartman!

Will you see your oldest moon yet before sunrise October 14?

You will have to be outdoors very early in the morning - within an hour of sunup. You'll need a clear sky in the east, with no trees or tall buildings in the way.

Nearby super-Earth likely a diamond planet

A rocky planet twice Earth's size orbiting a nearby star might be a diamond planet.

Magnetic pole reversal not a sign of doomsday

Earth's magnetic field has flipped its polarity many times over the millennia.

Gallery of planetary nebulas from Chandra and Hubble

Our sun will become a planetary nebula, billions of years from now. So, in a way, looking at these images is like looking at our own sun's future.