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Well, has anything in the universe ever experienced zero gravity?
Well, if you drew a line between earth and the moon and called it the X axis, even if the net effect of gravity was 0 at a certain spot somewhere along it, there would still be attraction from Y and Z directions from other stars/rest of the universe.
I started to think that the austronauts who went to the Moon might have been in zero gravity at the point where the gravitational attraction of the moon cancelled out the gravitational attraction of the Earth. The net effect would be zero, but, I'm not sure it's legitimate to describe that as zero gravity.
So, is canceling of forces allowed?