A small, extremely dense star that emits regular, closely spaced radio signals is a(n) ____________________.
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Q14: Spherical clouds of dust and gas, known
Q15: The mass of our galaxy calculated from
Q16: The _ zone is the inner part
Q17: The big bang occurred _ years ago.
A)
Q18: One _ is the distance traveled by
Q20: A dying star as massive as our
Q21: What do astrophysicists call the poorly understood
Q22: The surface of the Sun that we
Q23: All the known elements heavier than iron
Q24: The radiation emitted by stars, galaxies, and
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