Like wrinkles on aging skin, Mercury's lobate scarps are proof that planets with iron cores shrink as they age.
Two years of data come together to show Mercury spinning in false color.
Physical fitness and a sound mind were only part of the "right stuff" for NASA's very first astronaut.
This little green meteorite could be the very first of its kind.
Stop and listen while I elaborate on NASA's latest discovery: Mercury might have water ice hidden in craters up around its north pole. No fakin'.
After over six years and five billion miles, The MErcury Surface, Space ENvironment, GEochemistry and Ranging (MESSENGER) probe has finally entered orbit around our solar system's innermost planet. Today, NASA has released MESSENGER's first ten images, including this one, which in case you can't tell, is in full color.