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_____ suggested that the Sun and moon orbited Earth, and the rest of the planets orbited the Sun. Ptolemy Kepler Brahe
The planets were thought by Ptolemy to orbit the Earth in deferent and epicycle motions. [ Although the idea that the planets orbited the Sun had been suggested many times, it was not until the 17th century that this view was supported by evidence from the first telescopic astronomical observations, performed by Galileo Galilei ]
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Asked 4/25/2013 10:07:17 AM
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What is the definition of energy?
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Updated 8/7/2015 3:32:24 PM
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Energy is the capacity of a physical system to perform work.

Added 8/7/2015 3:32:24 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by yumdrea [8/7/2015 9:22:01 PM]
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