Earth, between sweltering Venus and frozen Mars, formed and orbits within a band where water could persist in solid, liquid, and gaseous phases. Mars had surface water, but not as much as Earth, and ...

Solar and cosmochemical data indicate high levels of carbon, nitrogen, and oxygen in the Sun. Researchers have unveiled a new ...

Scientists are reconsidering old information about Uranus. NPR's Scott Simon explains the problem with photos taken of the ...

NASA's Juno spacecraft has sent back new, eye-catching images of Jupiter, capturing intricate views of the planet's turbulent atmosphere as well as one of its lesser-known moons. On Oct. 23, the ...

Test yourself and see if you can you can name the eight planets in our solar system to become top of the class.