Pluto is too small to be considered a planet anymore, but our solar system appears to have a new ninth planet.
Extrasolar planets form along misaligned orbits.
Astronomers made a big discovery in determining Pluto's dwarf planet credentials.
One of the great mysteries: Does life exist elsewhere in the universe. Research has found that such planets may be more common, and much closer, than we think.
Pluto was demoted to dwarf planet status, but it still has moons. This new moon, called P5 for now, is the fifth moon found orbiting Pluto.
If recent research is correct, the blackness between stars harbors more excitement than you could possibly comprehend.
Why are the planets where they are instead of somewhere else?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Where did our planets come from?