Discovered last year, the comet C/2023 A3 Tsuchinshan-ATLAS will be visible in the California sky on Saturday night for the first time in 80,000 years.

Comet Atlas and the Hunter's Supermoon should be visible this week in Massachusetts. Here's how to see them.

A groundbreaking discovery was recently made about the largest comet ever observed hurtling toward the sun from the Oort Cloud in the outer reaches of our solar system.

A Newly Discovered and Brilliantly Green Comet Is Dazzling Astronomers. Here’s What to Know About the Glowing Celestial Visitor Initial observations suggest the comet, called C/2025 F2 (SWAN ...

Comet Tsuchinshan-ATLAS will have a close encounter with the sun today (Sept. 27) here's how to make the most of comet viewing opportunities this weekend and beyond.

Comet A3 is a long-period comet from the Oort Cloud, a sphere around our solar system home to millions of comets, and it's in an orbit of roughly 80,000 years.

The 3I/ATLAS, which was first spotted on July 1, has the fastest velocity of any solar system visitor to date, NASA says. The comet’s 130,000 mph speed is nearly 100 times the speed of some bullets.

Discovered last month by a telescope in Chile, the comet known as 3I-Atlas is only the third known interstellar object to pass our way.

Is 3I/ATLAS an alien space probe? An irregular comet? Debate rages around status of 3rd interstellar object ever spotted. Harvard astrophysicist Avi Loeb discusses implications with ‘Magazine.