The Sun and the Earth are a part of a larger _____ which is constantly moving and changing.
A
Universe
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B
Galaxies
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C
Big Bang
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D
None of these
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Solution
The correct option is A Universe
Before Copernicus, Westerners believed that the Earth was at the center of the universe and that the Sun revolved around the Earth, as did the stars and the planets.
Specifically, the earth and sun revolve around a mutual center of mass (which is very close to the center of the sun).
No, the sun is not fixed, but is in its own orbit around the center of the galaxy (the milky way) -- which is also in motion.
How we know that the earth orbits the sun and not the reverse is that relativity assures us that physical laws are similar in any moving frame -- however, objects in a circular orbit are actually in an accelerating frame.