The Oort Cloud is a theorized invisible spherical shell that surrounds the Sun.

The spherical shell known as the Oort Cloud is, for all practical purposes, invisible. Its constituent particles are spread so thinly, and so far from the light of any star, including the Sun, that ...

There’s an old saying in astronomy — “comets are like cats; both have tails and are unpredictable.” For once, a comet is ...

Comet Tsuchinshan-ATLAS (C/2023 A3) will likely remain visible to the naked eye through October 21st and the largest ...

The “comet of the century” will still be visible for another few days in North America. The icy object, known to scientists ...

The comet—traveling about 44 million miles away—was observed from Earth for the first time earlier this month.

For the first time in 80,000 years, skywatchers can see the Comet C/2023 A3 Tsuchinshan-ATLAS. Here's how long the comet will ...

An ancient celestial body that may once have been witnessed by Neanderthals will make its first close pass by Earth in ...