Most comets have a nucleus (center) that is less than six miles (10 km) wide. The size of a comet changes depending on how close it is to the sun. As a comet gets closer to the sun, the ices on the surface of its nucleus vaporize and form a cloud called a coma around the nucleus that can expand out to 50,000 miles (80,000 km). A tail also forms on a comet as it approaches the sun. Comet tails can be over 600,000 miles (1 million km) long. Thus, the comet in the movie would have been significantly smaller by the time it had hit earth, having had a large portion of its ice vaporize in its journey around the sun, and would weigh much less than the 500 billion tons the President said it weighed.
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05/03/2025 alle ore 09:06
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