Astronomers estimate this icy body has a diameter of 62 miles to 124 miles (100 to 200 km), making it about 10 times wider than a typical comet. This estimate is quite rough, however, as the comet remains far away from Earth and its size was calculated based on how much sunlight it reflects.
Newly found mega comet may be the largest seen in recorded history | Space
Newly found mega comet may be the largest seen in recorded history | Space
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