"If a person falls freely, he won't feel his own weight. This simple thought made a deep impression on me." - A. E.

		Gravity: It's Universal Article for grades 9 through 12 We owe our lives to gravity. It holds the atmosphere to Earth and keeps us all from falling off into space. Not to mention that without gravity, the stars and planets—including Earth—wouldn't even exist!
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		Space Shuttle Orbiter Curriculum Materials for grades 9 through 12 Did you know that satellites and the Space Shuttle don't need engines to power their orbits? See how Earth's gravitational pull bends their forward motion and keeps them moving around the planet.
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		John Michell and Black Holes Article for grades 9 through 12 Imagine gravity so strong that even light is contained by its force. When a country parson first described black holes in 1783, the concept was so ahead of its time that it was mostly ignored.
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		Georges Lemaître, Father of the Big Bang Article for grades 9 through 12 When a Catholic priest—cosmologist first proposed that the universe began as a "primeval atom," it seemed preposterous. Yet, within a few years, his theory had helped revolutionize cosmology.
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