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 ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, Pluto was officially reclassified as a dwarf planet by the ...

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 ...