P1 - Life Cycle of Stars

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  • Created by: kat-y
  • Created on: 02-05-16 13:24
A nebula is...
a cloud of dust and gas (mainly hydrogen gas) which is pulled together by its own gravity to make a star..
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When gravitational potential energy is converted into kinetic energy, the hydrogen...
gets hotter because the particles move faster
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What happens when the gas get hot enough?
The nuclei if the hydrogen atoms in the gas cloud fuses together.
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What happens in the fusion reactions?
Hydrogen atoms are converted into helium
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Not a lot of energy is released in fusion reactions, true or false?
False
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What stage is the Sun currently in?
Main sequence
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How many years does the star take to fuse most of the hydrogen into helium?
10 billion.
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What happens after 10 billion years?
The star will have used up most of its hydrogen fuel so it swells up to become a red giant.
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Other elements fuse together in the...
collapsing core of the red giant
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How long does the red giant remain for?
About a billion years
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What happens after a red giant remains for a billion years?
The star throws off a shell of gas
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What happens to the rest of the star after it has thrown off a shell of gas?
It will be pulled together by gravity and collapse to become a white dwarf star.
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Do fusion reactions happen inside a white dwarf?
No, it will gradually cool
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A black dwarf is formed...
about a billion years after the white dwarf has cooled.
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Do stars take millions or billions to complete their life cycles?
Billions
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How many years ago did the Sun form?
4.5 billion
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Other cards in this set

Card 2

Front

When gravitational potential energy is converted into kinetic energy, the hydrogen...

Back

gets hotter because the particles move faster

Card 3

Front

What happens when the gas get hot enough?

Back

Preview of the front of card 3

Card 4

Front

What happens in the fusion reactions?

Back

Preview of the front of card 4

Card 5

Front

Not a lot of energy is released in fusion reactions, true or false?

Back

Preview of the front of card 5
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