A 4 billion-year-old comet 80 miles wide is headed toward Earth - BGR

An ancient comet is hurtling towards Earth from the Oort Cloud and astronomers say that it is the largest comet we've ever discovered.

An ancient comet, believed to be over 4 billion years old is headed towards the Earth. The massive comet is at least 80 miles across, making it twice the width of Rhode Island. It’s currently speedin… [+3066 chars]

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