What is the zone of avoidance?
A) a part of the region of the Solar System where it is too dangerous to send spacecraft
B) a quadrant of the Galaxy where no galaxies exist
C) a part of the sky in which astronomers cannot observe due to bright emission from interstellar dust
D) the region of the sky where no galaxies are seen due to obscuring dust in the Milky Way
Correct Answer:
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Q41: A bright red nebula is called an
Q42: Compared to a cold molecular cloud at
Q43: We know interstellar matter exits because
A) we
Q44: How do we know that some interstellar
Q45: What is the difference between an emission
Q47: Which of these objects can be found
Q48: According to the density-wave theory, spiral arms
Q49: The _ theory offers a likely explanation
Q50: What is the density-wave model?
A) It is
Q51: Astronomers think the Milky Way has spiral
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