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An unprecedented year-long study was made of Hale-Bopp by two NASA observatories—the Hubble Space Telescope and the International Ultraviolet Explorer. Astronomers estimated that it had a monstrous nucleus about 19 to 25 mi in diameter. The average comet is thought to have a nucleus of about three miles in diameter, or even smaller. By comparison, the comet or asteroid that struck Earth 65 million years ago, possibly causing the extinction of the dinosaurs, was probably six to nine miles across.
The Solar System
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Comets
- Comets
TrendingHere are the facts and trivia that people are buzzing about.
Did Birds Evolve from Dinosaurs?
The Twelve Dancing Princesses
Current Events This Week: January 2023
African Americans by the Numbers
Andersen’s Fairy Tales: Contents
The Celtic Twilight: A Teller of Tales
TrendingHere are the facts and trivia that people are buzzing about.
Did Birds Evolve from Dinosaurs?
The Twelve Dancing Princesses
Current Events This Week: January 2023
African Americans by the Numbers
Andersen’s Fairy Tales: Contents
The Celtic Twilight: A Teller of Tales
- Did Birds Evolve from Dinosaurs?
- The Twelve Dancing Princesses
- Current Events This Week: January 2023
- African Americans by the Numbers
- Andersen’s Fairy Tales: Contents
- The Celtic Twilight: A Teller of Tales
