X-rays easily penetrate Earth's atmosphere and reach the ground from space
a. True
b. False
Indicate whether the statement is true or false
False
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A typical meteor is created by a particle about the size of a
A) pea. B) baseball. C) car. D) basketball.
According to today's classification system, how many major planets are there in the solar system?
a. 10
b. 9
c. 8
d. 11
One of Tycho Brahe's major contributions to astronomy was to prove that ________ was ________.
A. a comet; outside Earth's atmosphere B. a supernova (exploding star); much farther away than the planets C. the Sun; the center of the solar system D. both A and B E. A, B, and C
Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size. B) be moving away from us, with more distant ones moving faster. C) be made mostly of dark matter. D) rotate rapidly.