Life Cycles of Stars

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  • Created by: Hope
  • Created on: 01-05-14 21:13
What are stars formed of?
Massive clouds of dust and gas in space
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How are stars formed?
Gravity pulls the dust and gas together, it gets hot and nuclear reactions start
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How does a star stay stable during the main sequence period?
The forces in it are balanced
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How does a star maintain its energy output?
The massive amounts of hydrogen it consumes
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What is the star called when its going through the stable period?
Main Sequence star
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What is the path of a small star similar size to the sun?
Main sequence star, red giant, white dwarf and black dwarf
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What is the path of a star much bigger than our sun?
Main sequence star, red super giant, supernova, and then can be either nuetron star or black hole
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Define: Nuclear Fission
The splitting of the nucleus to generate heat
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Where is nuclear fission usually used?
In the rods of nuclear power stations
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What are the two fissionable isotypes that can be used in Nuclear Fission?
Uranium -235 and plutonium 239
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Explain how nuclear fission works...
They fire a neutron into the nucleus, the nucleus splits into two and releases 2 or 3 neutrons the neutrons go onto the break up more nucleuses and energy is released
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Complete this sentence: Nuclear fission is a...
Chain Reaction
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What are two problems with Nuclear Fission?
Radioactive waste is produced and the reaction has to be controlled
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How do scientists control the reaction in Nuclear Fission?
Substances can absorb the neutrons if the reaction is too fast or if its too slow they remove the substances
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Define: Nuclear Fusion
The joining of two nuclei to make one larger nucleus
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Complete this sentence: In nucleur fusion, when the two nuclei fuse together they create...
A very large amount of energy
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What is a problem during the reaciton in nuclear fusion?
Each atom has a nucleus with a positive charge so they will repel
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What factors during nuclear fusion allow the nuclei to join together
Lots of heat and lots of gravity
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Where does nuclear fusion occur?
In stars
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Why are scientists trying to preform nuclear fusion on earth?
We could harness the energy and use it in power stations as it is non toxic and non radioactive
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Why are scientist finding it difficult to preform nuclear fusion on earth?
There needs to be an extensive amount of heat energy (like in the sun)
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Other cards in this set

Card 2

Front

How are stars formed?

Back

Gravity pulls the dust and gas together, it gets hot and nuclear reactions start

Card 3

Front

How does a star stay stable during the main sequence period?

Back

Preview of the front of card 3

Card 4

Front

How does a star maintain its energy output?

Back

Preview of the front of card 4

Card 5

Front

What is the star called when its going through the stable period?

Back

Preview of the front of card 5
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