Theories of the Universe
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| Heliocentric Model | belief that the sun was in the middle of the universe; the model that we currently believe
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| Geocentric Model | belief that the Earth was in the middle of the universe
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| How are the Heliocentric and Geocentric Models alike? | They both believe that the planets are moving. They both believe the moon orbits Earth. They are both theories.
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| Big Bang Theory | belief that the universe began (formed) as a large explosion of matter and energy that continues to expand today
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| Put these in order from smallest to largest: Universe, Earth, Galaxy | Earth, Galaxy, Universe
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| According to the Big Bang Theory, how long ago was our universe created? | 14 billion years ago
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| name of our galaxy | Milky Way
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| three types of galaxies | spiral, elliptical, and irregular
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| type of galaxy that we are | spiral
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| where we are located in our galaxy | in the outer arm called Orion
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| gravity | the force that causes the planets to remain in orbit around the sun, the force that pulls two objects toward each other, and the force that keeps us from floating away from the ground
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| theory | explanation or model that is backed by scientific evidence; a theory can change
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| What can cause a theory to change? | A scientist can discover new information.
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| How did Galileo observe the solar system? | with a telescope
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| How do the planets orbit the sun? | in an elliptical motion
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