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small gravity measurements

gre
in Physics

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What is the smallest object ever observed with gravity?

 

Also, how is it determined/known that subatomic particles (ie free electrons) have gravity?

Gravity in the sub-millimetre scales has not been fully explored, let alone anything on the sub-atomic scale.

 

There are experiments exploring gravity on the mm scale. Maybe someone else here can enlighten us. If not try a google search.

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