A science journal receives this claim:
"As the Big Bang theory and the Steady State theory both match the observations of distant galaxies, neither theory has stronger scientific support."
The table summarises two sets of observations.
| Observation | What was measured |
|---|---|
| Light from distant galaxies | Absorption lines are shifted to longer wavelengths, with larger shifts for more distant galaxies |
| Radiation from regions of sky with no visible objects | A faint microwave signal, corresponding to a temperature of about 2.7 K, arrives with almost the same intensity from every direction |
The Big Bang theory's prediction of the microwave signal was published several years before the signal was detected.
Evaluate the claim made to the science journal.
94 exam-style questions on Edexcel GCSE Physics 7.2 The Universe and red-shift, covering 7.2.1 Big Bang and Steady State theories, 7.2.2 Evidence for the Big Bang, 7.2.3 The Doppler effect and red-shift, 7.2.4 Red-shift as evidence for an expanding Universe, and 7.2.5 The CMB and the accepted model. Each one has a worked solution and a mark scheme showing where the marks go.