According to current scientific estimates, when did the Big Bang occur?
A) about 4.5 billion years ago
B) about 65 million years ago
C) about 10 billion years ago
D) about 20 billion years ago
E) about 14 billion years ago
Correct Answer:
Verified
Q20: If we use 1 millimeter to represent
Q21: Which of the following correctly describes the
Q22: What do astronomers mean by the Big
Q23: A typical galaxy is a .
A)collection of
Q24: In a ten- billion to one scale
Q26: Suppose we make a scale model of
Q27: Stars nearby to our sun have an
Q28: Where is our solar system located within
Q29: How long does it take the Earth
Q30: Our solar system consists of .
A)the Sun
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