It is big enough to fit 63 Earths inside it. Among the solar system's eight planets, only Jupiter and Saturn are larger. Its ...

With 8 planets now known, the thoughts of astronomers ... than any of the planets in the outer solar system. Nevertheless, because it orbited the Sun like a planet, it was classified as a planet ...

We're showing that, everywhere we look now, there was some sort of magnetic field that was responsible for bringing mass to ...

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to find ...

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 ...

The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury is closest to the Sun. Neptune is the farthest. Jupiter: This planet has a faint ring system composed ...

Exoplanets can be quite different from Earth, but occasionally researchers find one that gives a sneak peak into what the ...