Which statement best describes the status of the Copernican and Ptolemaic theories of the solar system shortly after Copernicus invented his theory about 1550, and before Tycho?
A) Both theories agreed with the experimental facts.
B) Both theories were known to be wrong.
C) Ptolemy's theory fit the experimental facts better than the Copernican theory.
D) Copernicus had proved that Ptolemy's theory was incorrect.
E) Although Copernicus couldn't disprove Ptolemy's theory, the Copernican theory agreed much better with the experimental facts than did the Ptolemaic theory.
Question 2
As measured in Earth's rest frame, a spaceship traveling at 0.964c takes 11.2 y to travel between planets. How long does the trip take as measured by someone on the spaceship?
A) 2.98 y
B) 7.28 y
C) 42.1 y
D) 30.7 y
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