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12 Cards in this Set
- Front
- Back
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How many planets are their in the solar system? |
8- inner planets~ mercury, Venus, earth, mars.
Then the asteroid belt Outer planets- jupiter, Saturn, Uranus, Neptune. |
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What are the circular paths the planets take round the sun called?
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Ellipses.
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Other than planets and the sun what else in in the solar system?
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Dwarf planets e.g. Pluto, comets, dust, ect these orbit the sun. Planets often have moons orbiting them.
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How much bigger is the sun than the earth?
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100 times bigger
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How can you see stars if they do not emmit light like the sun?
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The suns light reflects off them!
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How old is the solar system?
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5 thousand million years ago or 5 billon years ago.
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What was the solar system formed from?
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Big clouds of dust and gas.
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Explain the process that formed our solar system.
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Dust and gas some got squeezed the gravity collected the particles together until it became so heavy they started to collapse in. At centre a protostar formed. Temp rose. Fusion started. Lots of heat and light. Some elements clump together to form planets
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What is the first stage of nuclear fusion?
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Hydrogen collide to form helium releasing lots of energy.
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What are comets made of?
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Rock dust and ice.
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How are all the chemical elements with heavier atoms than helium or hydrogen were formed how?
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In the stars by fusion of different nuclei.
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What are the oldest rocks on earth?
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Meteorites.(rocks from space that crashed into earth formed not long after the birth of the solar system around 4500 million years old).
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