This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

Well, it depends on the size of the objects causingthe gravity, so, their masses.For example, the force of gravity on themoon is smaller thanthe force of gravity on the Earthbecause the moon is ...

Legend has it that Isaac Newton had the moment of inspiration that would lead to his theory of gravity when, on a warm ...

The Earth, for example, is massive enough for the force due to gravity to be noticed. Some objects fall differently depending on how gravity and air resistance interact. A feather, for example ...

A suitcase-sized quantum sensor could soon reveal hidden water, oil, and even underground mountains—all by tracking how atoms ...