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MCQBeginnerStars & Stellar Evolution
IAAC — 2019 Final Round
Question 23
Sunspots are black regions that temporarily appear on the Sun. Their number highly increases every ... years. This period is also called the solar cycle.
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Source
Source: International Astronomy and Astrophysics Competition (IAAC), Final Round 2019. Question wording and answer-choice text are transcribed from the official training PDF; the explanation and metadata are original.