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 ...

The six planets will be visible in the days immediately leading up to Jan. 21, and for about four weeks afterward. Mars, ...

After counting my keys, I was left pondering three obvious questions: "Why do I have 16 keys, what are they for, and when was the last time I actually used any of them?" ...

What better way to start a season about the Earth than by looking back on it from an astronaut’s perspective? At a time when the activities of assorted billionaires and emerging superpowers are making ...

Astrophysicists have imaged a large number of exocomet belts around nearby stars, and the tiny pebbles within them. The crystal-clear images show light being emitted from these millimeter-sized ...

Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that ...

A rare parade of planets will light up the night sky throughout January. Six planets will be in alignment for the rest of the ...

Plus: Saturn’s moon Iapetus is visible, our Moon passes the bright star Spica, and Mars skims south of Pollux in Gemini in ...

The temperature is predicted to be around 22 degrees during the swearing-in, the coldest since Ronald Reagan’s second ...