CCEA GCSE Physics
CCEA GCSE Physics 2.5 Space Physics Exam Questions
Free CCEA GCSE Physics revision for 2.5 Space Physics: what you need to know, common mistakes and exam-style questions with answers. Covers the Solar System, satellites, life cycles of stars, supernovae, black holes, the Big Bang, red shift, exoplanets and light years.
Practise 2.5 Space Physics with past papers
Once you have learnt this topic, find the 2.5 Space Physics questions in real CCEA GCSE Physics past papers and mark them with the mark scheme. Doing lots of real questions is the quickest way to learn how examiners ask about each idea.
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About CCEA GCSE Physics 2.5 Space Physics
Space Physics is the final topic of Unit 2 in CCEA GCSE Physics. It covers the structure of the Solar System, the role of gravity in orbits and the uses of artificial satellites. You need to describe how stars form and the life cycle of a star like the Sun, and what happens to much more massive stars, including supernovae, neutron stars and black holes. The topic also explains the evidence for the Big Bang, red shift and cosmic microwave background radiation, the search for exoplanets and the light year. It links to fusion in 1.5. Examiners often ask for life cycle sequences and Big Bang evidence.
What you need to know
- The Solar System The Sun is at the centre with eight planets in elliptical orbits, plus dwarf planets, moons, asteroids and comets. Gravity provides the force that keeps planets in orbit around the Sun and moons around planets.
- Artificial satellites Satellites orbit the Earth and are used for communications, weather monitoring, navigation (GPS), observing the Earth and astronomy. Geostationary satellites orbit once every 24 hours so they stay above the same point on the Earth.
- Life cycle of a Sun-like star A nebula (cloud of gas and dust) collapses under gravity to form a protostar. When it is hot enough, hydrogen nuclei fuse into helium and it becomes a main sequence star, stable because outward pressure balances gravity. It then becomes a red giant and finally a white dwarf.
- Massive stars Much more massive stars become red supergiants and then explode as a supernova. The remaining core becomes a neutron star or, for the most massive stars, a black hole from which not even light can escape.
- Big Bang evidence The universe began from a very small, hot, dense point and has been expanding ever since. Light from distant galaxies is red-shifted (wavelength increased), showing they are moving away, and more distant galaxies show greater red shift. Cosmic microwave background radiation is the leftover radiation from the early universe.
- Exoplanets and light years Exoplanets orbit stars other than the Sun; scientists analyse their atmospheres for gases such as oxygen that could indicate life. A light year is the distance light travels in one year, about 9.5 x 10^15 m.
Common mistakes in 2.5 Space Physics
- Saying a light year is a unit of time. It is a unit of distance.
- Writing that red shift means galaxies are turning red. It means the wavelength of their light is increased because they are moving away.
- Saying the Sun will become a supernova or a black hole. A Sun-like star ends as a white dwarf.
- Describing main sequence stars as burning hydrogen. The energy comes from nuclear fusion of hydrogen into helium.
- Leaving out the balance of forces when explaining why a main sequence star is stable: outward pressure from fusion balances the inward pull of gravity.
Try three 2.5 Space Physics exam-style questions
1. Describe the life cycle of a star with a mass similar to the Sun, from its formation. (4 marks)
Show the mark scheme answer
Nebula of gas and dust collapses under gravity to form a protostar; fusion of hydrogen begins and it becomes a main sequence star; it expands into a red giant; it becomes a white dwarf.
2. Explain how red shift provides evidence for the Big Bang. (3 marks)
Show the mark scheme answer
Light from distant galaxies has an increased wavelength (red shift); so galaxies are moving away from us; more distant galaxies show greater red shift, so the universe is expanding from a single point.
3. Light travels at 3 x 10^8 m/s. Calculate the distance of one light year in metres, taking one year as 3.15 x 10^7 s. (2 marks)
Show the mark scheme answer
Distance = speed x time = 3 x 10^8 x 3.15 x 10^7; = 9.45 x 10^15 m.
2.5 Space Physics FAQs
What does CCEA GCSE Physics 2.5 Space Physics cover?
It covers the Solar System and orbits, artificial satellites, the life cycles of stars, supernovae, neutron stars and black holes, the Big Bang, red shift, cosmic microwave background radiation, exoplanets and light years.
Which unit is 2.5 Space Physics examined in?
It is examined in the Unit 2 written paper, Waves, Light, Electricity, Magnetism, Electromagnetism and Space Physics.
How should I revise the life cycle of stars?
Draw a flow chart that splits after the main sequence into one path for Sun-like stars and one for massive stars, and learn the key process at each stage, such as fusion starting or gravity causing collapse.
