I have been trying to imagine ways to visualise the gravitational field of the earth... It's near zero at the outer edges of the atmosphere, strong at sea level, strongest at the quarter point, then drops off to zero again towards the middle as the masses cancel each other out... Something like a 3D donut?
This got me thinking about black holes. Would they also have an area of zero g right at the centre where all the surrounding mass cancels each other out?
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