Gravity on the Moon Is About One-Sixth of Earth's
That is why Apollo astronauts could bounce across the surface in bulky suits.
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Apollo 15's David Scott Dropped a Hammer and a Feather on the Moon
In 1971 both hit the ground at the same time in the near-vacuum, confirming Galileo's insight.
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Einstein Described Gravity as Curved Spacetime
Mass bends the fabric of space and time, and objects follow the curves.
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Gravity Is the Weakest of the Four Fundamental Forces
A small magnet can lift a paper clip against the pull of the entire Earth.
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Newton Published the Law of Universal Gravitation in 1687
It appeared in his Principia and explained both falling apples and planetary orbits.