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Question
The Sun and the Earth are a part of a larger _____ which is constantly moving and changing.
The Sun and the Earth are a part of a larger _____ which is constantly moving and changing.
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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.
- 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.
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