The cards Question What is the solar system? Tap to flip Answer The Sun and the collection of objects in orbit around it. Question How many planets are there in the solar system? Tap to flip Answer Eight. Question What is a planet? Tap to flip Answer A very large, spherical object orbiting a star that has cleared the path of its orbit of other objects. Question How does a dwarf planet differ from a planet? Tap to flip Answer A dwarf planet has not cleared the path of its orbit of other objects. Question What is a moon? Tap to flip Answer A natural object in orbit around a planet. Question Do the planets and dwarf planets orbit the Sun in the same direction or in different directions? Tap to flip Answer The same direction. Question What keeps a moon in orbit around its planet? Tap to flip Answer The gravitational attraction between the moon and the planet. Question What keeps each planet in orbit around the Sun? Tap to flip Answer The gravitational attraction between the planet and the Sun. Question Does gravity act only close to the surface of a planet? Tap to flip Answer No. Gravitational forces act over huge distances, for example keeping planets in orbit. Question What is a satellite? Tap to flip Answer An object that orbits a planet; it can be natural (a moon) or artificial. Question What is a polar orbit? Tap to flip Answer An orbit in which the satellite passes over the planet's poles. Question What is a geostationary orbit? Tap to flip Answer An orbit directly above the equator, completed in the same time as the planet, so the satellite stays stationary in the sky. Question How does the speed of a satellite change along its orbit around Earth? Tap to flip Answer It stays constant. Question Why does a satellite's velocity change constantly as it orbits Earth? Tap to flip Answer Because its direction keeps changing. Question What does the gravitational force on an orbiting satellite change: its speed or its direction? Tap to flip Answer Its direction (it accelerates without changing speed). Question What is a star? Tap to flip Answer A ball of very hot gas and plasma that emits radiation, powered by nuclear fusion in its core. Question What is nuclear fusion? Tap to flip Answer The merging of small nuclei into larger nuclei, releasing energy. Question Is the Sun a star? Tap to flip Answer Yes, a medium-sized star. Question What is a nebula? Tap to flip Answer A region of space containing traces of gas (mostly hydrogen) and dust. Question What pulls a nebula together to form a star? Tap to flip Answer Gravitational attraction. Question Which gas makes up most of the gas in space? Tap to flip Answer Hydrogen. Question What is a protostar? Tap to flip Answer A dense, hot ball of gas formed by a collapsed nebula. Question What creates the very high temperatures as a star forms? Tap to flip Answer Dust and gas accelerating towards its centre over a very long time. Question What happens in a protostar when it becomes a star? Tap to flip Answer Hydrogen nuclei fuse, converting mass into gamma radiation that heats it. Question What is a main sequence star? Tap to flip Answer A star fusing hydrogen in its core, stable for long periods of time. Question In which direction does radiation pressure from nuclear fusion push in a star? Tap to flip Answer Outwards from the centre. Question What is true of the forces in a star that is in balance? Tap to flip Answer The force from radiation pressure equals the gravitational force in size. Question What happens to a star after all its available hydrogen has been fused? Tap to flip Answer Gravity contracts it, raising its temperature until other nuclei can fuse. Question What is a red giant star? Tap to flip Answer A larger, cooler star formed after the hydrogen in its core has run out. Question What is a white dwarf star? Tap to flip Answer The white-hot core of a star left after its outer layers have escaped into space. Question What causes a supernova? Tap to flip Answer Gravitational collapse of a star after its fuel is exhausted, making it explode. Question What is a neutron star? Tap to flip Answer An incredibly dense star formed after a supernova. Question Why are images from space telescopes not distorted like those from the ground? Tap to flip Answer They are above Earth's atmosphere, which distorts images. Question Besides avoiding atmospheric interference, why put a telescope in space? Tap to flip Answer To observe parts of the spectrum that cannot reach Earth's surface. Question What is a galaxy? Tap to flip Answer A collection of many millions or billions of stars held together by gravitational forces. Question What is redshift? Tap to flip Answer An increase in the wavelength (and decrease in frequency) of light caused by a star or galaxy moving away from us. Question What does the visible spectrum of light from a star or galaxy show? Tap to flip Answer Dark lines at certain frequencies. Question In redshift, which way do the hydrogen lines in a spectrum move? Tap to flip Answer Towards the red end of the visible spectrum. Question Why do stars appear to twinkle? Tap to flip Answer Earth's moving air refracts their light in changing directions. Question What does the redshift of light from distant galaxies show? Tap to flip Answer Nearly all galaxies are moving away, and more distant ones are moving away faster. Question What does the Big Bang Theory say about how the universe began? Tap to flip Answer It began from a very small region that was extremely hot and dense, then expanded and cooled. Question About how long ago were all galaxies in the same place? Tap to flip Answer About 14 billion years ago. Question What is cosmic microwave background radiation (CMBR)? Tap to flip Answer Radiation produced in the hot early universe, since stretched to the microwave part of the spectrum. Question Was the Big Bang an explosion of matter that already existed? Tap to flip Answer No. It was an expansion of space together with the creation of all matter in the universe. Question What is a scientific theory? Tap to flip Answer Our best understanding based on all the evidence, subject to rigorous testing. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Physics Unit Gravity in space Exam boards AQA, Edexcel, OCR Tiers foundation and higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Physics lesson by Oak National Academy licensed under Open Government Licence (OGL)
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