Space PhysicsAQA GCSE Physics (8463)

Solar System: Stability of Orbital Motions; Satellites

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

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1
How many planets are in our solar system?
Answer & explanation
Correct: option B
Eight planets — Pluto was reclassified as a dwarf planet in 2006.
2
What holds the planets in orbit around the Sun?
Answer & explanation
Correct: option C
The Sun's gravitational pull keeps planets in orbit.
3
What is the Sun?
Answer & explanation
Correct: option C
The Sun is a main-sequence star at the centre of our solar system.
4
Which galaxy do we live in?
Answer & explanation
Correct: option B
Our solar system is part of the Milky Way galaxy.
5
The Sun formed about 5 billion years ago from:
Answer & explanation
Correct: option B
Gravity pulled a nebula together to form the protostar that became the Sun.