Gravity is the force of action between two objects. It’s called a natural force because it acts at a distance rather than needing to be in contact. Gravity is the force that holds us down on Earth and ...

Some forces are called contact forces because they require objects to touch. One is tension force, found in stretched wires. Another is the force found in a spring. And last are resistive forces: ...

Polaris Dawn, the first of the Polaris Program’s three human spaceflight missions, announced today the extensive suite of science and research experiments the crew and SpaceX will conduct throughout ...