Everyone knows the names of the planets, but Earth feels different. It doesn’t sound powerful like Jupiter or mysterious like Neptune. It’s plain, familiar, and oddly comforting; it’s a word that ...

As telescopes have become more powerful, it’s turned out our solar system is not the only game in town: There are millions of other planets out there in the galaxy. But we’re still teasing out clues ...

The familiar concept of a planetary core, a small, dense metallic heart we take for granted, may be the exception rather than ...

Nearly all of the planets in the solar system are about to march through the night sky in a single-file line. This planetary alignment, sometimes called a planet parade, will include all of the solar ...