Gravity determines the structure and motion of every object in the Universe—and that's just for starters. It also supplies the forces that keep celestial objects in orbit, and its laws enable astronomers to analyze phenomena too far away to observe. These resources investigate this fundamental force.

		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 Games Curriculum Materials for grades 5 through 8 Here on Earth, we tend to take gravity for granted. Yet the astronauts aboard the Space Station need to learn how to do everything without it. Can you imagine shooting hoops in a "weightless" world?
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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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