The life cycle of stars 0.0 / 5 ? PhysicsAstronomyGCSEAQA Created by: LinaCreated on: 07-04-14 14:34 Stars initally form from... clouds of gas and dust 1 of 21 The force of gravity makes the gas+ dust spiral together to form a... protostar 2 of 21 Grav. energy is converted into... energy, so... Heat; temperature rises 3 of 21 When the temperature gets high enough, hydrogen nuclei undergo nuclear fusion to form helium nuclei 4 of 21 This nuclear fusion gives out massive amount of... Heat and light 5 of 21 After a star is born, smaller masses of gas+ dust may... Pull together to form planets that orbit the star 6 of 21 The star immediately enters a... Long stable period 7 of 21 The heat created by the nuclear fusion.. Provides an outward pressure to balance the force of gravity pulling everything inwards 8 of 21 The star maintains its energy output for millions of years due to ... The massive amounts of hydrogen it consumes 9 of 21 In this stable period, the star is called a ... Main sequence star 10 of 21 Eventually, the hydrogen begins to run out+.... Heavier elements like iron are made by nuclear fusion of helium 11 of 21 The star then swells into a... if it is a small star Red Giant 12 of 21 The star then swells into a ... if it is a big star Red Super Giant 13 of 21 The star becomes red because... the surface cools 14 of 21 A small star becomes unstable+... ejects its outer layer of dust+ gas- planetary nebula 15 of 21 This leaves behind a hot, dense solid core- A white dwarf 16 of 21 A white dwarf cools down to a... Black dwarf and eventually disappears 17 of 21 Big stars start to glow brightly as they... undergo more fusion+ expand+ contract, forming heavy elements like iron in nuclear reactions 18 of 21 The stars explode in a... Supernova, forming elements heavier than iron+ ejecting them into the universe to make planets+ stars 19 of 21 The exploding supernova throws the outer layers of dust+ gas into space, leaving a very dense core, called... Neutron Star 20 of 21 If the star is big enough, the neutron star will become a... Black hole 21 of 21
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