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MCQIntermediateGalaxies & Large-Scale Structure
USAAAO — 2021 First Round
Question 8
An astronomer detected a galaxy and decided to analyze its different parts and physical aspects. The frequency generated by a =spin-flip" transition of atomic hydrogen is ν0 = 1420.406MHz, however it was detected on the galaxy as ν = 1422.73. He finds that: 1. Population I stars are (1) and are metal-(2). 2. The galaxy is (3) from us with a speed of (4) km × s−1. Choose the alternative that correctly completes sentences above.
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Source
USAAAO 2021 First Round. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.