On a cosmic calendar,in which the history of the universe is compressed into 1 year,when did the dinosaurs become extinct?
A) in late December
B) in late November
C) in late October
D) in late September
E) in late August
Correct Answer:
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Q21: Which of the following correctly lists speeds
Q22: From the fact that virtually every galaxy
Q23: How long would it take to count
Q24: If you represented each star by a
Q25: On a cosmic calendar,in which the history
Q27: On a cosmic calendar,in which the history
Q28: Most of the mass in the Milky
Q29: If we use 1 millimeter to represent
Q30: What is an astronomical unit?
A)the average speed
Q31: Which of the following statements about the
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