Space physics: GCSE Physics
Solar system, life cycle of stars, orbital motion, red shift, Big Bang and satellites
The short version
Gravity holds orbits. Stars follow mass-dependent life cycles. Red shift of galaxies supports an expanding universe and the Big Bang.
Key idea
moon orbits a planet; dwarf planet has not cleared its neighbourhood (e.g. Pluto)
Grade 2–3: The Sun sits in the middle. Earth goes around the Sun. The Moon goes around Earth.
Grade 5–6: I can name star, planet, moon, dwarf planet, comet and meteor and say what each orbits.
Grade 9: I never write that gravity "runs out" in space. Weight is smaller far from a mass but gravity still provides the inward force that keeps satellites in orbit.
Go a bit deeper
Then Sun-like: red giant -> white dwarf. Massive: red super giant -> supernova -> neutron star or black hole
Grade 2–3: A star starts as a dusty cloud, shines, then either shrinks to a hot cinder or blows up.
Grade 5–6: I can write nebula, protostar, main sequence, then the two branches.
Grade 9: I name H to He on the main sequence and I never send the Sun into a black hole. Massive stars make the heavy elements in a supernova.
Worked example
Worked example
Grade 2–3: The Sun sits in the middle. Earth goes around the Sun. The Moon goes around Earth. Grade 5–6: I can name star, planet, moon, dwarf planet, comet and meteor and say what each orbits. Grade 9: I never write that gravity "runs out" in space. Weight is smaller far from a mass but gravity still provides the inward force that keeps satellites in orbit.
Lessons in this topic
- The solar system
- Life cycle of stars
- Orbital motion
- Red shift
- The Big Bang
- Satellites
In the app each lesson is video (when we have a real YouTube id) then intro, learn and summary steps.
What the examiner wants
Describe solar-system objects, star life cycles including supernova products, circular-orbit force ideas, red-shift evidence, and compare satellite types.
Try these questions
Cover the answers and have a go first. Worked solutions are underneath.
The Sun produces energy mainly by
A moon orbits
After the main sequence, a star like the Sun becomes a
A supernova can leave behind a
Common mistakes
- A shooting star is not a star. The Moon is not a planet. Do not list "galaxy" as a solar-system object.
- The Sun will not become a black hole. Do not skip protostar. Do not write that stars "burn coal" or need oxygen.
- Do not write that there is no gravity in space. Do not put a force arrow along the velocity for a steady circular orbit.
- Red shift is not a red filter and not "the galaxy is heating up". Nearby blue-shifted galaxies do not disprove expansion of the universe as a whole.
Answers and working
Frequently asked questions
Is GCSE Space physics on Combined Science and Triple?
Space physics is Triple-only Physics. Combined Science students can skip it.
Which exam board is this Space physics page for?
The ideas are board-agnostic for AQA, Edexcel, OCR, WJEC and CCEA. Paper lengths and question numbers differ — check your specification.
Is Space physics Foundation or Higher?
The core ideas appear on both tiers. Higher papers add extra application and some HT-only detail, marked in lessons with a Higher badge.
Learn, try, get feedback, fix the mistake
Open the stepped lesson, then the quiz with hints. Required-practical and calculation questions use the same method you will need in the paper.
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