A comical planetary beauty contest is described, highlighting the unique traits of each planet: Mercury’s fiery nature, Venus ...

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

A new study rewrites the story of human evolution, suggesting that intelligent life is not rare but a natural planetary ...

For decades, we believed there were nine planets in our solar system—until Pluto was reclassified in 2006. But what if ...