Turns Out the Megacomet Is More Than 80 Miles Wide—and It's Headed Our Way

Don't look up!

While the megacomet fell out of the main space news spotlight, NASA astronomers set the the Hubble Space Telescope’s sights on the object in the months since—and discovered how truly immense it is. A new paperon Tuesday confirmed that Bernardinelli-Bernstein had a nucleus—the icy core at the center of all comets—that’s more than 80 miles wide. That’s roughly 50 times larger than other comets and the largest ever observed.

Even with the imagery provided by the Hubble, scientists still had their work cut out for them in sussing out its precise size. After all, the megacomet is still incredibly far away. So the team had to process images taken of the comet by the Hubble in a computer model, which gave them an approximate estimation of its mass. Now astronomers can confirm that the Bernardinelli-Bernstein comet is much larger than any other comet ever discovered.

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