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11 Cards in this Set
- Front
- Back
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Asteroids Asteroids are mini planets or planetoids that orbit the sun. Name two properties of asteroids. |
- mostly orbit between Mars and Jupiter - large rocks that were left over from formation of the solar system |
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Asteroid or planet How were all bodies in the solar system formed? |
When clouds of gas and dust collapsed together due to gravitational forces of attraction. |
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1. What does the gravitational force determine? ______ gravitational force prevents _____ from joining together to form another _______ |
1. The mass of an object Jupiters Asteroids Planet |
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Origin of the moon What do scientists believe the result of our moon was? |
- collision between two planets in the same orbit - iron from one planet melted and joined to earths core - less dense rocks began to orbit and joined together to form the moon |
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What scientific evidence is there to support this view? |
Average density of earth = 5500 kg/m3 while the moon is 3300 kg/m3 No iron on moon Earth and moon has equal oxygen composition |
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Evidence for asteroids Theory that asteroids collided with earth: - found quantities of the meta, iridium ( a metal not normally found in earths crust but common in meteorites |
- fossils are found below the layer of iridium, few fossils found above it - tsunamis have disturbed fossil layers, result in fossils fragments being carried up to 300km inland |
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A comets orbit 1. Where do most comets orbit? |
1. They pass through the orbit of mercury and well beyond Pluto. |
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As the comet passes close to the ___, the ___ melts and solar winds blow the _____ to the comets ____ which always points ______ from the sun. |
Sun Ice Dust Tail Away |
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What things do scientists monitor? |
The path of comets and NEO near earth objects |
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Why does the speed of a comet increase when it is close to sun and decrease as it is further away? |
Because of the change of gravitational attraction. |
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NEO's If an NEO was in course of collision with earth which if collide can be the end of earth life, what do they do to prevent this? |
Explode a rocket into space to alter the course of the NEO |
