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MCQIntermediateStars & Stellar Evolution
USAAAO — 2023 First Round
Question 14
An empirically determined approximate formula for the lifetime of a star is given by: T = (M☉ / M)^2.5 × 10^10 years, where T is the stellar lifetime and M is the mass of the star. If the very first stars in the universe formed approximately 400 million years after the Big Bang, what is the most massive such star that could still exist today?
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Source
USAAAO 2023 First Round. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.