One ____________________ is the distance traveled by light in a year, or 9.5 trillion kilometers.
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Q13: In the _ zone of a star,
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)
Q19: A small, extremely dense star that emits
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
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