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MCQBeginnerStars & Stellar Evolution
USAAAO — 2026 First Round
Question 20
Some stars formed in the early universe are still observable today. If an observer observed one and it is still in the main sequence phase, what would most likely be its mass?
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Source
USAAAO 2026 First Round, Question 20. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.