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The Sun plus the collection of bodies in orbit around the Sun such as planets, dwarf planets, moons, asteroids, comets, etc.
4
votes
What's the weight of the earth?
In Newtonian physics, the Earth accelerates towards the Sun. The force between the Earth and the Sun is about 3.4*10^22 Newtons.
The distance between the Earth and Sun is roughly constant, but that i …
62
votes
Why do we say that the Earth moves around the Sun?
Imagine two donut-shaped spaceships meeting in deep space. Further, suppose that when a passenger in ship A looks out the window, they see ship B rotating clockwise. That means that when a passenger …
15
votes
Accepted
Is the distance between the Sun and the Earth increasing?
I think the reasoning has an error. It assumes $v$ is constant, but instead we ought to assume the angular momentum is constant.
By dimensional analysis that leads to
$$r \propto \frac{L^2}{GM}$$
…