A tiny gold ball is the smallest object to have its gravity measured

Even teeny objects obey the law of gravity.

A gold ball just 2 millimeters wide, with a mass of about 90 milligrams, is now the smallest object to have its gravitational pull measured. Observations of that gold sphere tugging on another similarly sized sphere confirm that gravity behaves as expected even for extremely weak gravitational fields, physicists report in the March 11 Nature.  Previous experiments have involved objects with masses of hundreds of milligrams or more.

Newton’s law of universal gravitation states that the gravitational force between two masses is inversely proportional to the square of the distance between them. Double the distance between two objects and they’ll pull

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