What did Halley predict that is relevant to modern astronomy?
The return of a comet, Halley's Comet
The existence of extraterrestrial life
The Big Bang theory
The collision of galaxies
Answer
Halley's Comet, named after the astronomer Edmond Halley, is a periodic comet that orbits the Sun every 76 years. It is best known for its bright appearance and has been observed and recorded by astronomers for over 2,000 years. Halley's most recent appearance was in 1986, and its next return is expected in 2061.
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