The monstrous 85-mile-wide comet C/2014 UN271 is the second most distant body originating from the Oort Cloud found to be chemically active.

Recent observations have revealed carbon monoxide venting from the largest comet ever seen, providing clues about its origins ...

Astronomers have discovered that the largest comet from the Oort Cloud, a shell of icy bodies at the very edge of the solar system, is bursting with chemical activity. Using the Atacama Large ...

A giant comet – which scientists say is arguably the largest comet discovered in modern times – is on its way toward the sun and will make its closest approach to Earth in 2031.

The largest comet ever seen, with a nucleus larger than the state of Rhode Island is heading our way, but Earth is in no danger of a "Don't Look Up" situation, astronomers say.

Largest comet ever discovered is heading toward the sun — but no need to panic Earlier this year, astronomers discovered the largest comet ever, which is nearly 100 miles wide.

We've only known about its existence for a few short weeks, and already astronomers have been able to learn a lot about the ...

At an estimated 93 miles wide, the Bernardinelli-Bernstein Comet is believed to be the largest comet ever discovered. It will make a close approach to Saturn's orbit in a decade.

Astronomers have discovered the largest known comet, and it’s about a thousand times more massive than others. Comet Bernardinelli-Bernstein, so named because it was found by University of ...

The largest comet ever is heading toward the sun -- but don't worry, it won't pose any threat to us as it won't come closer than the orbit of Saturn.

The comet, known as C/2014 UN271 (Bernardinelli-Bernstein), has an estimated diameter of about 80 miles. That's bigger than Rhode Island and about 50 times larger than the heart of most comets.

A massive comet — so large that scientists had previously mistaken it for a dwarf planet — is hurtling through space toward our solar system and is expected to arrive in about 10 years, ...