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The Sun and its planets are in the Milky Way galaxy."},{"text":"The Triangulum galaxy.","correct":false,"explanation":"Triangulum belongs to the same Local Group as our galaxy, but it does not contain the solar system. Our solar system is in the Milky Way galaxy."},{"text":"The Whirlpool galaxy.","correct":false,"explanation":"The Whirlpool is a distant spiral galaxy sometimes confused with the Milky Way because of its shape. 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Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune

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A solar system has one star and objects orbiting it.
A galaxy contains many stars, including many with planets.

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Gravity pulls material inwards.
Energy from fusion pushes material outwards.

","mcqOptions":null},{"id":"5f2b1fb1-1e68-4bb9-a645-0f361661a70b","cardType":"basic","points":2,"front":"Why does a stable star remain the same size?","back":"The inward pull of gravity balances the outward push from fusion energy.","mcqOptions":null},{"id":"83a3a79e-20cd-4e99-88d0-8ad961bbfc47","cardType":"basic","points":2,"front":"What would happen if the inward and outward effects in a star were not balanced?","back":"The star would tend to collapse or expand rather than remain stable.","mcqOptions":null},{"id":"ae16ea23-3c0c-4b56-aebe-f2ce978675aa","cardType":"cloze","points":null,"front":"Our solar system contains the Sun, eight planets, dwarf planets and [ ].","back":"Our solar system contains the Sun, eight planets, dwarf planets and natural satellites.","mcqOptions":null},{"id":"ef734986-08f9-495e-8c24-4b2f637948b3","cardType":"cloze","points":null,"front":"The Sun began as a [ ] of dust and gas.","back":"The Sun began as a nebula of dust and gas.","mcqOptions":null},{"id":"e59dc0ed-80ca-44c9-8fc6-833eeea5b26f","cardType":"cloze","points":null,"front":"The Sun became stable when hydrogen nuclei began joining to form helium by [ ].","back":"The Sun became stable when hydrogen nuclei began joining to form helium by nuclear fusion.","mcqOptions":null},{"id":"ad7f7ed9-9548-4b41-813f-23faebbff992","cardType":"cloze","points":null,"front":"As a nebula collapses, its material becomes increasingly [ ].","back":"As a nebula collapses, its material becomes increasingly dense.","mcqOptions":null},{"id":"da79081e-929d-4ee7-bbc7-1e0ff72da0c1","cardType":"cloze","points":null,"front":"A stable star is in [ ] because gravity and fusion effects balance.","back":"A stable star is in equilibrium because gravity and fusion effects balance.","mcqOptions":null},{"id":"8f5232c7-e8bb-4072-b426-b5ba64578223","cardType":"cloze","points":null,"front":"In a stable star, gravitational attraction continues pulling material [ ] while fusion energy pushes it outwards.","back":"In a stable star, gravitational attraction continues pulling material inwards while fusion energy pushes it outwards.","mcqOptions":null}]}],"examCountdown":{"examDate":"2027-05-25","paperLabel":"Paper 1"},"heading":"8.1.1 Our solar system","title":"8.1.1 Our solar system Flashcards","topbar":{"backHref":"/gcse/physics/aqa/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"a6b3ead1-ccfd-5e09-b8cc-e202fc5ae677","walled":"$L39"}],"$L3a","$L3b"]