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30 Results for "gravity"

"gravity" Stuff:

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Find out why a ball thrown in the air will return to the ground. 
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Gravity is the force of attraction between all objects in the Universe. Objects with more mass have greater gravitati...
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A black hole is a collapsed star. When high-mass stars use up all their fuel, their cores collapse inward. The heavie...
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Mass and weight may seem like the same thing, but in fact these two measurements are very different. Mass is the tota...
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Since the 1920s, observations of distant galaxies reveal that our universe was expanding.
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Most mass in the universe is not normal matter we can see, like stars, planets, and puppies. In fact, 80% of the mass...
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Many historians consider English scientist Sir Isaac Newton the first modern physicist. He explained how gravity affe...
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A galaxy is a giant, spinning object made of gas, dust, and stars held together by gravity. Galaxies come in differen...
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You have to be a really big thinker to imagine the size of the Universe.
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Albert Einstein made many great contributions to science that include the Special Theory of Relativity and the Genera...
Reading + Video

Astronomy is a BIG subject. We've brought learning about it down to size with these big ideas.
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What was the universe like right after the Big Bang? To find out, you'd have to look back in time. That was the job o...
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Look at all the things around you -- your computer, your finger, your desk, even the trees outside. They're all made...
Reading

Where did Einstein get his great ideas? Find out with this virtual tour.
Reading

Find out what makes the Sun glow, and other amazing facts, in an up-close interview with the Sun.
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Einstein might never have become a worldwide celebrity had it not been for the English astrophysicist Arthur Eddington.
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A star is a huge glowing ball of hot gas. Deep inside its core, hydrogen atoms smash together, forming helium and rel...
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Ninety-three million miles from Earth, a giant ball of hot gas brightens the sky. Nuclear reactions in the Sun's core...
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Asteroids are space rocks that have existed since the formation of the planets over 4.6 billion years ago. Scientists...
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Size up the planets with a model scavenger hunt.
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There are many kinds of energy. But only one makes plants grow, drives the weather, and keeps our planet warm enough...
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Comets are like "dirty snowballs" that have orbited the Sun since our Solar System formed, billions of year...
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Did you ever see a "shooting star"? What you really saw was a meteor burning up in the Earth's atmosphere.
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To find north, find Polaris. Earth rotates on its axis, which points directly at Polaris. From Earth, Polaris is the...
Reading + Game

Find out what we know about Mars in this online tour of Earth's closest neighbor.
Video

Find out how five different environments produce Earth's amazing minerals!
Reading

Tour this spinning pinwheel in space that we call home.
Reading + Game

Find out how the Big Bang Theory came to be.
Reading

How is the ocean like a layer cake? What creatures live there? And how important is the ocean? Take a dive and find out!
Reading

OLogy learning: Find resources for K-5 grade levels.