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Contrast the chemical composition of interstellar gas with that of interstellar dust.
Q18: There appears to be a correlation between
Q26: The Sun's luminosity is greatest when there
Q33: Complex molecules in the interstellar medium are
Q36: A star's motion towards or away from
Q41: What is the defining property of the
Q50: Ionization of hydrogen in H II regions
Q69: The primary component of Pluto's atmosphere when
Q78: _ clusters are much older and richer
Q80: The proton-proton chain requires a temperature of
Q98: The _ magnitude of a star depends