The mass of our galaxy calculated from its rotational speed is much larger than the mass of all the known matter within. Astronomers have proposed that ____________________ may provide the additional mass to explain this difference.
Correct Answer:
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Q10: The cosmic background radiation is _ radiation
Q11: Jets of gas called _ shoot upward
Q12: The Sun is composed primarily of hydrogen
Q13: In the _ zone of a star,
Q14: Spherical clouds of dust and gas, known
Q16: The _ zone is the inner part
Q17: The big bang occurred _ years ago.
A)
Q18: One _ is the distance traveled by
Q19: A small, extremely dense star that emits
Q20: A dying star as massive as our
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