Littered across the cosmos are massive, dead galaxies, containing roughly half the stars in the known Universe. Much about them remains a mystery, but a study suggests that they may have rotted from the inside out.
This aerial view shows all kinds of exposed geological features that are waiting to be explored: long rugged ridges, plunging great craters and even the occasional wide flat plain. Sadly, it's at least 34 million miles away. Read more >
In anticipation of April 24th, NASA is padding its Instagram all weekend with short movie clips celebrating the scope that’s brought us some of our most iconic and awe-inspiring images of the universe.