Gravity: Pervasive Force (04:15)
Gravity is the most pervasive force in the universe. Gravity holds Earth's solar system together, and it is the cosmic glue that holds the universe together.
Galileo and Gravity (03:51)
Galileo first recognized gravity as a particular force. He discovered that all objects fall at the same rate.
Sir Isaac Newton and Gravity (02:55)
Newton used math to unlock a cosmic mystery. He calculated the force needed to shoot a cannon ball into orbit around the Earth. He realized that Earth is in free fall around the sun.
Gravity Express: Acceleration and Deceleration (02:12)
Using gravity alone, it would take 42 minutes for a person to traveling through a tunnel from one side of the planet to another.
Einstein's Space-Time (02:53)
Einstein describes gravity as a curvature of space and time. He proves that mass warps both space and time. Einstein spoke of space time as one unified object.
Earth's Escape Velocity (03:09)
Trajectory is determined by velocity and the force of gravity. Earth has an escape velocity that allows an object or person going faster to escape Earth forever. Earth's escape velocity is about 25,000 mph.
Gravity: Potential and Kinetic Energy (02:34)
Kinetic and potential energy come from gravity. NASA uses this energy exchange principle to add speed to its missions. Knowing how to use the power of gravity will enable mankind to travel farther and faster across the universe.
On a Zero-G flight, people experience temporary weightlessness. Gravity is measured in terms of G-forces. The number of G-forces one would feel on acceleration is the same as the force of gravity during deceleration.
Effects of Weightlessness (05:03)
Since the dawn of the space age, scientists have worked on minimizing the life-threatening and damaging effects of weightlessness. The human frame is not designed for the absence of terrestrial 1G gravity.
Future of Earth's Orbit (03:24)
Human presence on Earth is contingent on the presence of gravity. Billions of years in the future, Earth will be pulled closer to the sun unless technology can harness the forces of asteroids to force Earth into an orbit more distant from the sun.
Gravitational Waves (06:03)
A neutron star is the burned-out core often left after a supernova. When two such dense objects orbit each other, space-time is stirred by their motion, and gravitational energy ripples throughout the universe.
Credits: Gravity (00:26)
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