Our universe is approximately 13.7 ________ years old.
A) hundred
B) thousand
C) million
D) billion
E) trillion
Correct Answer:
Verified
Q18: One of the nearest stars is Alpha
Q19: According to the figure below, Earth is
Q20: The average distance between Earth and the
Q21: Before you can scientifically test a hypothesis,
Q22: A hypothesis is an idea that is
A)
Q24: The figure below measures distances in the
Q25: Which of the following is true?
A) A
Q26: In science an idea that cannot be
Q27: The speed of light is approximately
A) 3,000
Q28: A theoretical model is
A) a made-up explanation.
B)
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