What contribution to astronomy was made by Tycho Brahe?
A) The planets' orbits around the Sun are ellipses, not circles.
B) The Earth is not the center of the Universe.
C) His observations of planetary motion with great accuracy proved circular orbits could not work.
D) His telescope revealed the moons of Jupiter before Galileo noted them.
E) Retrograde motion must be explained by epicycles larger than those of Ptolemy.
C
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