The Sun has stayed about the same size for billions of years.
Which statement explains why the Sun does not collapse?
The pull of gravity from the planets balances the Sun's own gravity
Fusion has stopped, so there is no force that could make it collapse
Energy released by fusion causes an outward pressure that balances gravity
The Sun's magnetic field pushes outwards and balances its gravity
50 exam-style questions on OCR GCSE Physics 8.3 Beyond Earth, covering 8.3.1 Red-shift and the expanding universe, 8.3.2 Evidence for the Big Bang model, 8.3.3 Formation of the Sun and stellar equilibrium, 8.3.4 Radiation emitted by hot bodies, 8.3.5 The solar system and satellites, 8.3.6 Gravity and circular orbits, 8.3.7 Orbital radius and orbital speed, 8.3.8 Radiation balance and the temperature of the Earth, and 8.3.9 Seismic waves and exploring hidden structures. Each one has a worked solution and a mark scheme showing where the marks go.