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Alien life could thrive on 'supercritical' CO2 instead of water

Bizarre shape of Uranus' 'Frankenstein' moon explained

Saturn may have given birth to a baby moon, astronomers say

Mars makes closest approach to Earth in 6 years monday ahead of lunar cclipse

Mercury is shrinking, NASA photos reveal

NASA planning to send robotic mission to Europa, Jupiter's watery moon that may harbor life

Pale blue dot: Amazing NASA photo shows Earth from Mars

Ask a science teacher: What is a black hole?

Space weather: Cloudy with a chance of diamond rain

Cassini spacecraft photographs Earth from 900 million miles away