Scientists today do not accept the Ptolemaic model because:
A) it is ancient history.
B) it was too complicated, compared to Copernicus' heliocentric model.
C) it has been shown that Ptolemy faked his data.
D) it had no explanation for retrograde motion.
E) the work of Tycho and Kepler showed the heliocentric model was more accurate.
E
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The part of the universe we can see is referred to as the
A) observable universe B) Milky Way C) entire universe D) multiverse
Negatively charged particles in an atom are called ________.
A. protons B. neutrinos C. electrons D. positrons E. neutrons
The Sun formed from the gravitational collapse of a cold ________.
A. interstellar cloud B. red giant C. planet D. planetary nebula
A simple refracting telescope provides large magnification by employing
A) a short focal length objective and a short focal length eyepiece. B) a short focal length objective and a long focal length eyepiece. C) a long focal length objective and a short focal length eyepiece. D) a long focal length objective and a long focal length eyepiece.