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Q12: The nitrogen in the Earth's atmosphere came
Q27: What must an asteroid have in order
Q28: How did astronomers determine that elliptical galaxies
Q29: Gravitational lensing occurs when _ distorts the
Q40: If you found a galaxy with a
Q47: Why is hydrogen burning the main energy
Q66: Put the following eras in the history
Q68: An 8 M<sub> <span class="ql-formula" data-value="\bigodot"><span
Q69: If a sunspot is half as bright
Q99: In the superstring theory that successfully unites