Galactic Hearts of Glass (Artist Concept)

Alien Asteroid Belt Compared to our Own (Artist Concept)

Trojan Colors Revealed (Artist's Concept)

Comet 'Bites the Dust' Around Dead Star (Artist Concept)

The Beginning of the End of Star Formation

All Pillars Point to Eta

Using 'Dark Holes' to Spot Planets

All That Remains of Exploded Star

Exotic World Blisters Under the Sun (Artist Concept)

Galaxy M101

Spectrum from Faint Galaxy IRAS F00183-7111

The Mysterious Galactic Haze seen by Planck

Silicates in Alien Asteroids

Astronomers Uncover One of the Youngest and Brightest Galaxies in the Early Universe

Kepler-62 and the Solar System

'Peony Nebula' Star Settles for Silver Medal

Infrared Rose

NASA's Kepler Mission Discovers Its First Rocky Planet (Artist Concept)

Cracking the Code of Faraway Worlds

Galactic Pile-Up (Artist Concept)

Not-So-Bright Bulbs (Artist Concept)

Chasing Chickens in the Lambda Centauri Nebula

Chaotic Star Birth

Disk Around a Massive Baby Star (Artist's Concept)

Dragon's Lair

Planck's View of Orion

Groth Deep Locations Image

Hustle and Bustle at Center of Milky Way

Stars in Orion as Seen from Mars

Kepler-20f -- An Earth-size World (Artist's Concept)

Galaxy NGC 55

GALEX 1st Light Near and Far Ultraviolet -100

Simulation of Galactic Collision (Simulation)

Slender Galaxy with Robust Black Hole

Stellar Jewels Shine in New Spitzer Image

NGC 1291

Black Hole Swallows a Star

Dark Star-Making Factory

A Vast Disk of Comets

Forecasting Weather on Distant Worlds (Artist Concept)

Mysterious Object He2-90

Birth of an Earth-like Planet (Artist concept)

CW Leo

Galaxy NGC 3079

Cygnus Loop Nebula

Three Great Eyes on Kepler's Supernova Remnant

Galaxy M82

Extreme Planets (Artist Concept)

Weighing in on the Dumbbell Nebula

Mapping the Infrared Universe: The Entire WISE Sky -- Rectangular Format

Portrait of Our Dusty Past (Artist Concept)