Astronomers have discovered four planets that are just a fraction of the mass of Earth orbiting Barnard’s Star, which is 6 ...

If you’re trying to cheat death on Mercury, this is very promising, but the news gets even better. Mercury's Solar Day is ...

These rather small planets are a stone's throw from Earth in galactic terms, but were too small for previous instruments to ...

Astronomers have identified a quartet of small rocky planets orbiting Barnard's star - one of our closest stellar neighbors - ...

Mars, Jupiter and Saturn are frequently seen in the night sky. But because Venus and Mercury orbit closer to the sun than Earth, with smaller, faster orbits, it's more rare for them to make an ...

As the fastest-moving planet in our solar system, Mercury goes retrograde three to four times a year for about three weeks. While planets, Mercury included, do not move backwards, they do slow their ...

Mars, Jupiter and Saturn are frequently seen in the night sky. But because Venus and Mercury orbit closer to the sun than Earth, with smaller, faster orbits, it's more rare for them to make an ...