Astronomers estimate that our galaxy contains ______ stars.
A) 100 thousand
B) 10 million
C) 100 million
D) 1 billion
E) 100 billion
Correct Answer:
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Q26: The Earth's atmosphere is rich in _,
Q27: To measure vast distances in the solar
Q28: Heat left over from this planetary formation
Q29: The sun, its eight planets and their
Q30: To the best of our knowledge, the
Q32: As planetismals struck the growing Earth, their
Q33: _ are small, planetlike bodies.
A) Planetesimals
B) Moons
C)
Q34: Large, smooth, dark areas visible on the
Q35: _ is the largest planet in both
Q36: _ is the smallest of the inner
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