"What surprised us, at the end, was how effective this type of impact could be in explaining Mercury's unusual structure ...

Between February 25 and February 28, all seven planets in our solar system will be visible in the ... because they are the farthest away and the smallest planet, respectively.

Now European Southern Observatory (ESO) thinks one of the objects floating along the main belt might be the smallest dwarf planet in our solar system — an asteroid known as Hygiea. Hygiea isn ...

In a breakthrough just six light-years from home, scientists have found four rocky exoplanets circling Barnard’s Star — our solar ... planets — named b, c, d and e — are some of the ...

Watch this video to find out more about the Earth, planets in our Solar System and other planets far off in outer space. From up here on the International Space Station I get a great view of Earth.