The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

Mercury has a rocky surface when, facing the sun, can reach highs of 800 degrees while overnight lows could reach minus 290 ...

Taking place in February, the planetary parade is a rare occurrence you don't want to miss form down here on Earth ...

To see the parade, find a dark place with a clear view of the western horizon at nightfall. Mercury and Saturn will be low in ...

NASA's Pioneer 11 spacecraft left the solar system! This was the second spacecraft to travel beyond the planetary part of our ...

Before then, Mercury and Saturn will meet in the evening sky in a rare close encounter, in an astronomical phenomenon known ...

A shell of icy objects at the edge of the solar system known as the Oort cloud has a pair of spiral arms that resemble a ...

The best opportunity to potentially see all seven planets is coming up on Feb. 28 around 6:10 p.m. ET, according to Shanahan.

Did you know our solar system might have had an extra planet? Scientists believe a mysterious ninth planet once existed but ...

Researchers expect similar sodium salts to be found on the dwarf planet Ceres, in water plumes from Saturn's Enceladus, and ...

Saturn’s rings are an arresting sight even through modest telescopes. The planet is made mostly of hydrogen and helium whereas the rings are billions of pieces of mostly bright-white water ice and ...

Since Dec. 7, 2024, the red planet has been making its westerly retrograde. But on Monday, that all ends, according to ...