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13 Cards in this Set
- Front
- Back
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What galaxy are we in
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The milky way
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How many stars are in the Milky Way
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Billions
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Roughly how far are other stars in our galaxy
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Millions times greater than distance between planets
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What force keeps our stars together in our galaxy
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Gravity
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Do galaxies rotate
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Yes, like a ctaherine wheel with spiral arms
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What is the universe
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a large collection of billions of galaxies
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How far apart are galaxies
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Millions of times greater than stars with galaxy.
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What is universe mostly made of
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Empty space!!
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What force causes orbits?
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Gravity
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What does it mean if an object is travelling in an orbit
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That it is trying to move forward but is constantly changing direction as a force acts upon it. so orbit is balance of forward motion and pull inwards
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What sort of orbits do planets have
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circular. sun's gravity
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What other things orbit
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Moons, comets, satellites
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What are comets
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small lumps of icy rock
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