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 ...

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 ...

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

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

The alignment involves Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune, all visible on the same side of the Sun.

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 ...

Are 7 planets having a rare alignment in our night sky? News of this unusual celestial event has been flooding social media ...

A very rare treat is about to grace Earth's night skies.

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

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

Explore NASA's upcoming space missions from 2025 to 2033, including lunar landers, Mars probes, asteroid flybys, and ...