本题目来源于试卷: Fields D.1 Gravitational Fields & Potential ，类别为 IB物理学
[问答题]
A space station X orbits re.c40;pb wbnu7,8nlymp s -fsh ub-),d; gjrEarth with orby6 nlsud0 e:08nsiu(k ital radius $R$.
1.State Newton's universal law of gravitation.
2.Explain why an astronaut in the space station feels weightless.
3.The space station changed its position so that its orbital radius is $2R$.
Explain how the gravitational field strength of Earth at this new position compares to that at the orbital radius $R$.
4.Another space station Y with a smaller mass orbits Earth with at the same orbital radius $R$.
Compare the orbital speed of Y to the orbital speed X.
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