This weekend, six planets are set to share the sky in a rare “planet parade,” giving stargazers a short but magical window to ...

Relatedly, astronomers may have just pushed the upper size limit of what counts as a planet.

Jupiter reaches opposition on Jan. 10, but it provides a good sky show through the entire month. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...

General relativity helps explain the lack of planets around tight binary stars by driving orbital resonances that eject or destroy close-in worlds. This process naturally creates a “desert” of ...

It was one of humanity’s greater vanities that we ever questioned whether there are any planets in the universe beyond the eight in our little solar system. Our sun is a perfectly ordinary star, ...