Of all the stars in the universe, one dominates our celestial neighborhood: the Sun. It's so large that a million Earths could fit in its boundaries.
Mars is home to the largest volcano in the solar system and a colossal valley. Despite its otherworldly features, it's the planet most like Earth.
The Earth has become a dangerous place to live, and it's only a matter of time before a cosmic force will annihilate the planet.
More than 60 moons rotate around this powerful planet. Its flowing colors and spots hold strange beauty, but contain violent storms and jet streams.
For thousands of years, man has found comfort in the moon as a lantern at nighttime, a timekeeper for farmers and a location finder for sailors.
A survivor of one of the most violent regions in the universe, learn about Earth's beginnings and the creatures that hold clues to how life began.
Mercury and Venus are hostile worlds -- one gouged with craters from cosmic collisions and the other a vortex of sulfur, carbon dioxide and acid rain.
Are Saturn's rings a celestial phenomenon or a cosmic illusion? Experts are now able to get closer to the furthest planet visible to the naked eye.
To know our place in the universe, take a look far, far away at the realm of alien galaxies. Our own galaxy is just one of hundreds of billions.
Ignited by the power of the atom, stars are anything but peaceful. They collide, devour each other and explode in enormous supernovas.
New discoveries regarding the outer planets -- Uranus, Neptune and Pluto -- are creating a fundamental rethinking of our solar system.
Take a tour of black holes, galaxy mergers, gamma ray bursts and magnetars. Massive black holes can literally "lasso" Earth out of the solar system.
The Search for Extraterrestrial Intelligence is a privately funded project using radio and optical telescopes to scan the stars for signals.