If you want to see what people are calling "the comet of the century," your last chance is coming up soon, as it will most likely not be visible with the naked eye anymore after this weekend. After that, the comet, known as "Comet C/2023 A3" in the ...

Experience the brilliance of comet C/2023 A3, visible nightly this October, with its closest approach to Earth on October 12.

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 Vieques Island, Puerto Rico, on the morning of September 30, 2024.

Above: Takaya Okada (Japan) observes Comet C/2023 A3 with his Unistellar EVSCOPE2. In the background you can see the comet tracing its beautiful tail across the sky. These past couple months, observers across the world observed Comet C/2023 A3 (Tsuchinan ...

NASA confirms 3I/Atlas poses zero threat, with its closest Earth approach a safe 270 million kilometres on 21 July 2025—over 1.7 times the Earth-Sun distance. ESA echoes this, calculating perihelion as too distant for planetary harm, with the comet fading from view after 30 October.

Comet Lemmon (C/2023 A3) dazzles in Ladakh. This comet has a green tail which is visible from Hanle. This study offers rare insights into the early solar system.

To photograph the comet, Alton Spencer left Danbury, finding darker and elevated spots in Bridgewater and Warren.

Skywatchers of Arizona might not have to wait long to see the first comet of 2025. Comet ATLAS C/2024 G3, also known simply as Comet G3, is currently headed toward the sun on its 160,000-year trip through the solar system. Like Comet A3, which was visible ...