Behind the planets in the solar system is the Kuiper Belt. An inventory of similar structures around other stars shows how unusual it is.

Stargazers will be able to view a rare alignment of seven planets in the night sky on Friday, February 28 when Mercury joins six other planets to become visible.

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

It’s divided into sections with names like “Lunar Lunch” and “Extraterrestrial Dinner,” because why settle for boring old ...

These massive currents carry material on a journey through and around star-forming galaxies before they settle and form stars ...

Jan. 21. A planet parade is when several of our solar system's planets are visible in the night sky at the same time. There ...