Step outside just after sunset and you may catch an unusual sight: six planets strung across the sky in a gentle arc. The ...

Six planets are set to align on Saturday, creating a planetary parade that will be visible to sky-gazers across the globe.

Analysis of an ancient meteorite suggests that rocky planets both near and distant from the sun may have formed at the same ...

A group of astronomers has found a solar system 116 light-years from Earth that seems to challenge current theories about how ...

Gas giants possibly developed slowly in the solar system. They developed cores layer by layer within a disk of ice and dust surrounding the early Sun. Once they were large enough, they attracted large ...

Moons may seem like quiet companions to the planets, but many of them are worlds every bit as fascinating as the planets themselves. Some are covered in oceans, some erupt with lava, and others hide ...