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The motion and chemical composition of stars in the outer halo may suggest that
Q2: How do we know how fast the
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Q10: Considering their lifetimes, which types of main-sequence
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Q30: Which of the following is true about
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Q38: What does "habitable zone around a star"
Q70: In modern cosmology, Einstein's cosmological constant is<br>A)
Q76: In the figure below, we expect the