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, If the vacuum of space is not strong enough to strip away the molecules and atoms in upper atmosphere (where there is a weak gravitational attraction) then how is it possible that we are able to pick up objects using a vacuum through a straw at ground level (where there is a strong gravitational attraction).
Also, liquid water will defy gravity by becoming a gas when a vacuum is introduced. The water in its gas phase then become suspended in the vessel, hence defying gravity.
A gas in a balloon will expand to fill the vessel, if a vacuum is introduced. The gas particles defy gravity again.
So, to conclude, gravity really doesn't exist.