What is look-back time?
A) the time it takes for the light from an object to reach Earth
B) the time it takes for a distant object to form
C) the time it takes for an object to orbit once around the Milky Way
D) the age of an object in light years
Correct Answer:
Verified
Q2: Which of the following types of objects
Q3: What does the term "galactic cannibalism" refer
Q4: Which of the following best describes poor
Q5: What type of galaxy has an elongated
Q6: Which of the following are produced when
Q8: What does an irregular galaxy contain?
A)mostly lower
Q9: What evidence leads astronomers to conclude that
Q10: Mathematical models indicate that one type of
Q11: If you wanted to measure the distance
Q12: If a disk galaxy is reasonably close
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