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Stable fusion reactions end when builds in a high- mass star's core.
Q19: Binary stars separated enough to be resolved
Q30: Can a star become a red giant
Q42: Newly- formed neutron stars start with weak
Q61: Most radio galaxies belong to Hubble's class
Q71: Compared to the size of the Sun,
Q74: At its brightest, Venus, at magnitude -
Q82: Two stars are both spectral type K2V;
Q101: The Hipparcos satellite has extended our accurate
Q128: A white dwarf's atoms have their electron
Q128: Our Sun lies about the middle of