P1 - Life Cycle of Stars 0.0 / 5 ? PhysicsAstronomyGCSEEdexcel Created by: kat-yCreated 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.. 1 of 16 When gravitational potential energy is converted into kinetic energy, the hydrogen... gets hotter because the particles move faster 2 of 16 What happens when the gas get hot enough? The nuclei if the hydrogen atoms in the gas cloud fuses together. 3 of 16 What happens in the fusion reactions? Hydrogen atoms are converted into helium 4 of 16 Not a lot of energy is released in fusion reactions, true or false? False 5 of 16 What stage is the Sun currently in? Main sequence 6 of 16 How many years does the star take to fuse most of the hydrogen into helium? 10 billion. 7 of 16 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. 8 of 16 Other elements fuse together in the... collapsing core of the red giant 9 of 16 How long does the red giant remain for? About a billion years 10 of 16 What happens after a red giant remains for a billion years? The star throws off a shell of gas 11 of 16 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. 12 of 16 Do fusion reactions happen inside a white dwarf? No, it will gradually cool 13 of 16 A black dwarf is formed... about a billion years after the white dwarf has cooled. 14 of 16 Do stars take millions or billions to complete their life cycles? Billions 15 of 16 How many years ago did the Sun form? 4.5 billion 16 of 16
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