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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 …
Mark Eichenlaub's user avatar
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 …
Mark Eichenlaub's user avatar
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 $$r \propto \frac{L^2}{GM}$$ …
Mark Eichenlaub's user avatar