![]() So in your case, I would agree with you that the sun is always providing gravity in that case. You have been thinking about the LaGrange point between the earth and the moon and I am thinking about the LaGrange point L1 between the sun and earth. ![]() It looks like we've not been singing from the same hymn sheet. ![]() Last-minute thought, is there zero gravity in the middle of a planet or a star? probably close to zero I think.Ĭlick to expand.First, in all my posts, I've said close to zero-gravity not zero-gravity, so yes, there is no place in the universe where it is completely free from gravity. So strictly speaking I think it's still fair to say that there is nowhere in the observable universe where there is zero gravity only close to zero gravity.Įven more strictly strictly strictly speaking these LaGrange points will jiggle about a bit due to tidal effects on the earth and convection currents in the sun etc. The best we can say is that it's close to zero-gravity (as I emphasised in my first post about this topic) around that point. A point has no volume so therefore there is no volume in space where there is zero gravity. It's a mathematical solution to an equation. The catch here is that in reality a 'LaGrange point' is just that, a 'point'. You will then leave the Lagrange point in a straight line and then come under the influence of the earth's gravity and start to orbit the earth. What I think will happen is that when you enter the zero-gravity space there will be no forces acting on you so your circular motion will change to linear motion as per Newton's first law of motion. the minute you enter a LaGrange point there is close to zero gravity so there is no centripetal force acting on you.
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