Once a theory has been tested thoroughly and is confidently believed by scientists, it becomes a ____________________.
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Q83: According to Kepler's third law, a planet's
Q84: Tables based on a heliocentric model of
Q85: The Ptolemaic model of the universe was
Q86: The first modern astronomer to propose a
Q87: Copernicus proposed that Earth moved around the
Q89: A _ universe is Sun centered.
Q90: Many classical Greek astronomers believed Earth could
Q91: Retrograde motion is from (north, south, east,
Q92: A(n) _ is a circle whose center
Q93: Classical Greek astronomers believed the motions of
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