Which Danish astronomer, through nightly observations of a comet, estimated its closest approach to Earth at about 230 times the Earth's radius?
Answer and explanation
Correct answer: C. Tycho Brahe
- Step 1: Tycho Brahe's observations of the comet of 1577 showed it was far beyond the Moon, about 230 Earth radii away at its closest. Answer: Tycho Brahe. Why not the others: Ole Rømer, Niels Bohr and Hans Christian Ørsted don't fit.
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