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What characteristic of a star primarily determines its location on the main sequence
Q19: Describe how we know that the expansion
Q41: A plot of the continuous spectra of
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Q67: The orbits of halo stars are typically
Q70: Helium flash occurs<br>A) because helium is very
Q75: In a reflecting telescope, the objective is
Q89: A star's absolute magnitude depends only on
Q93: Why are there few quasars at low
Q105: The unified model describes active galactic nuclei
Q114: What information about orbital inclination can we