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It's the life of the solar system.
It's the giant of the solar system.
Where did all the water go?
It's the sun's nearest neighbor.
It's invisible to the naked eye.
It's the lord of the rings.
This blue planet is out of whack.
Is it Earth's sister planet?
The majority of main-belt asteroids are in stable orbits that take between three and six years to complete a full circuit around the sun.
The Cassini probe began its voyage to Saturn in 1997. Photos it has taken have revealed secrets of the ringed giant as well as clues to the very beginning of the solar system.
Our life-giving sun throws tempests that can scramble modern technology. But new telescopes and satellites allow scientists to probe the secrets of this temperamental star.
The more scientists see of Mars, the more mystified and astonished they are about the powerful forces that shape its terrain. And new images are intensifying the debate.
At first glance Venus seems similar to Earth in many ways. But intense temperatures capable of melting lead and a sulfuric-acid shroud of clouds tell a different story.
Find out who takes home the Grand Prize!
Check out adventure videos from our West Coast Adventure Editor Steve Casimiro and go "Behind the Lens."
Get the science behind avalanches, tsunamis, and more.
Help conserve the world's natural resources.
Play games, watch videos, and much more in this just-for-kids site.