There are eight planets in the solar system, and each travels on its own path around the sun. But of these planets, which is nearest to the sun? Mercury is a strange little world. There are some ...

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

Our planet is just the right distance from the Sun for life to exist. We call it a Goldilocks planet because the Earth’s temperature, like the porridge in the Goldilocks fairy tale, is not too ...