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22 Cards in this Set
- Front
- Back
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What is the Geocentric Model? |
The sun & planets orbit the Earth |
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What is the Heliocentric Model? |
The planets all orbit the Sun |
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Who is Copernicus? |
The astronomer that came up with the Heliocentric Model |
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Who is Kepler? |
The astronomer that discovered that the orbits of the planets were elliptical |
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Name 2 reasons Pluto is not considered a planet. |
There are many other orbiting objects Pluto's size discovered. Pluto's orbit crosses Neptune's orbit. |
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Where are the inner and outer planets located in our solar system? |
The inner planets are in between the sun and the asteroid belt. The outer planets are located between the asteroid belt and the Kuiper Belt. |
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What do all the inner planets have in common? |
They are all terrestrial (rock) based. |
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What do all the outer planets have in common? |
They are all made out of gases and are larger than the inner planets. |
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How is an astronomical unit distance measured? |
The distance between the Sun & the Earth. |
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When is a light year used & when is an astronomical unit used? |
A light year is used when measuring distances outside of our solar system. An astronomical unit is used when measuring distances in our solar system. |
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What is the Kuiper Belt? |
A belt of icy, rock particles on the outer orbit of our solar system. |
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What is the Oort Cloud? |
A cloud of icy, rock particles outside our solar system that surrounds it. |
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Where do comets, asteroids & meteors come from? |
Comets come from the Kuiper Belt & Oort Cloud. Asteroids & meteors come from the asteroid belt. |
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What is a galaxy? |
A collection of solar systems, stars, gas & dust located in the Universe. |
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What is the name of our galaxy? |
The Milky Way |
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What is the name of a group of galaxies located near each other which includes the Milky Way galaxy? |
The Local Group |
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What is the type of galaxy that contains the oldest stars & are elliptical shaped. |
Elliptical galaxy |
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What is the type of galaxy that has a bulge of stars in the center and stars in spiral arms. |
Spiral galaxy |
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What is the type of galaxy that has no particular shape? |
Irregular galaxy |
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Where are the open cluster and globular cluster of stars located in our galaxy? |
Globular clusters are located in the center bulge & the open clusters are located in spiral arms of the galaxy. |
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What type of radiation existed at the time of the Big Bang? |
Gamma |
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What evidence is there that the universe is expanding? |
The far away galaxies are moving farther away from us. |
