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MCQBeginnerTelescopes & Observing
IAAC — 2021 Final Round
Question 35
What spectral region can be observed from the Earth even when there are clouds in the sky?
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Source
Source: International Astronomy and Astrophysics Competition (IAAC), Final Round 2021. Question wording and answer-choice text are transcribed from the official training PDF; the explanation and metadata are original. The supplied official solution PDF lists answer keys only through Question 30; this answer is independently derived.