What is the diameter of the Arecibo Observatory's primary reflector?

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Multiple Choice

What is the diameter of the Arecibo Observatory's primary reflector?

Explanation:
The key idea here is the size of Arecibo’s dish. The primary reflector spans about 305 meters, which is roughly 1000 feet. That large diameter gives the telescope a enormous collecting area and strong sensitivity for radio signals. The other options are either too small or too large compared to the actual dish, so 1000 feet best matches the real diameter.

The key idea here is the size of Arecibo’s dish. The primary reflector spans about 305 meters, which is roughly 1000 feet. That large diameter gives the telescope a enormous collecting area and strong sensitivity for radio signals. The other options are either too small or too large compared to the actual dish, so 1000 feet best matches the real diameter.

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