Beautifully captured against a starry sky, Comet C/2024 G3 (ATLAS) — dubbed by some as the "Great Comet of 2025" — shines brightly after its last approach to the sun for hundreds of thousands of years ...

Slooh members were among the first to confirm that the nucleus of comet 73P/Schwassmann-Wachmann had split into at least two large pieces. "They immediately pointed Slooh's telescopes to capture ...

The nuclei of most comets are about 1-2 miles across. The nucleus of Halley's comet, which is considered to be fairly large, was approximately 10 miles across in its largest dimension. Hale-Bopp's ...

This is the fourth comet Gröller has discovered, but given its extraordinary distance, it was the most exciting find, he says ...

A comet called ATLAS dazzled the southern skies for the last few weeks. Now it's heading out of view for half a million years ...

G3 (ATLAS), the 'Great Comet of 2025,' lit up the night sky in Chile, offering a rare and breathtaking sight for stargazers, with its bright tails and glowing coma.

A recent graduate of Harvard scanning the California sky found a "star out of place" last Sunday night. Stephen Kilston '65 had discovered a comet, the first one found in nine months. The young ...

Sometimes jets of sublimating ice whirl off the rotating comet nucleus like a fireworks pinwheel. Dust trapped in the ice breaks free. Pushed back by the pressure of the sun's radiation ...

Credited with the “dirty snowball” theory of comets, Whipple was the man who postulated the existence of a cometary nucleus. The theory was hotly contested. But as the first of more than 1,500 ...

One of the most noticeable features is the vaporized material of the comet's frozen-solid core, known as the nucleus, which gives the comet a unique shape. As the comet gets close to the sun ...