Once-in-a-lifetime comet streaks across night sky.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A recently ...

Under “don't ask, don't tell,” thousands saw their military service ended without an honorable discharge, meaning they missed ...

The comet, which will be visible to the naked eye, orbits the sun roughly once every 80,000 years—the last time it passed Earth humans were just migrating out of Africa. Comet A3 seen from ...

The visibility of the comet is dependent on clear weather conditions Marcos del Mazo/LightRocket via Getty Look up! A bright comet is expected to light up the sky this week. Comet Tsuchinshan ...

Comet Tsuchinshan-Atlas will be bright enough to see with the naked eye, so don't miss out on viewing this cosmic snowball this weekend. The comet will be closest to Earth on Saturday but should ...

Look up into the sky this month and you just might see a comet that won’t return for tens of thousands of years. Comet Tsuchinshan-ATLAS, also known as C/2023 A3 to scientists and pronounced ...

A comet discovered last year — known as C/2023 A3 Tsuchinshan-ATLAS — is set to make a close approach to Earth in the coming days. The snowy dirtball is nearly 2 miles in diameter and its tail ...

A recently discovered comet, known as C/2023 A3 Tsuchinshan-ATLAS, will make its closest approach of Earth on Saturday. Sky-gazers won't want to miss the event since it may be the last time the ...

New Yorkers should take some time to look up at the night sky this week as there's a chance to see a once-in-a-lifetime comet passing by. A combination of the two places of discovery led to its ...