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And how round are they?
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Gravity is the force by which a planet or other body draws objects toward its center.
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Glossary for "Sign Here!" words
Defines words in "Sign Here" game.
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Find definitions of space and Earth science terms
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How Do We Launch Things Into Space?
You need a rocket with enough fuel to escape Earth’s gravity!
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The answer isn't so simple...
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You will get a charge out of this activity!
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We can use a planet’s gravitational pull like a scale!
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Learn all about black holes and play Black Hole Rescue!
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How Many Solar Systems Are in Our Galaxy?
Astronomers have discovered 2,500 so far, but there are likely to be many more!
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A comet close to home
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and dark energy, too!
force
