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

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.

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 ...

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.

The Perseids appear each year when Earth crosses a trail of dust left by comet 109P/Swift-Tuttle. The comet takes 133 years to orbit the Sun and last passed near Earth in 1992 ...

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.