Which Estonian astronomer gave his name to the Öpik–Oort cloud of comets?
Answer and explanation
Correct answer: C. Ernst Öpik
- Step 1: He worked in Tartu and later in Armagh. Step 2. Öpik proposed the idea of a cloud of comets at the edge of the solar system. Answer: Ernst Öpik. Why not the others: The others worked in related fields.
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