expanding universe
What expanding universe means in Physics GCSE, as defined for AQA.
Definitions of expanding universe
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain expanding universe in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The conclusion drawn from the change of each galaxy's speed with distance, where the further away a galaxy is the faster it recedes and space is expanding everywhere.
Space itself is expanding, and observations of supernovae and red-shift provide evidence that supports the Big Bang theory.
Space itself is expanding and carrying the galaxies with it, rather than the galaxies flying apart through space.
Topics that use expanding universe
- Red-shift (physics only) (AQA GCSE)
Related terms
- absorption line spectra
- accelerating expansion
- dark energy
- dark mass and dark energy
- increase in wavelength
- measuring distance
- receding galaxies
- red end of the spectrum
Using expanding universe in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge