Largest known comet is heading close enough to us to become visible
By Ashley Strickland, CNN 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 Pennsylvania department of physics and astronomy graduate student Pedro Bernardinelli and Professor Gary Bernstein, is between 62 to 124 miles (100 to 200
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