Pearson Edexcel · GCSE · Physics
Course version: 1PH0 · Version from Sept 2016
7.10P Recall that as there is more evidence supporting the Big Bang theory…
Full specification wording
Topic 7 – Astronomy: 7.10P Recall that as there is more evidence supporting the Big Bang theory than the Steady State theory, it is the currently accepted model for the origin of the Universe
The Steady State theory proposed that the Universe has always existed and looks the same at all times, with matter continually created as it expands.
Checked against the Pearson Edexcel 1PH0 specification (opens in a new tab) on .
- Point 9 of 18
Study notes
From the checked teaching notes for this specification point.
The idea
The Steady State theory proposed that the Universe has always existed and looks the same at all times, with matter continually created as it expands. The Big Bang theory proposes the Universe began from a small, hot, dense region and has expanded since. Scientists compare the evidence: red-shift and the cosmic microwave background support the Big Bang, and the CMB in particular is hard to explain with a steady, unchanging Universe. Because more evidence supports the Big Bang theory than the Steady State theory, the Big Bang is the currently accepted model for the origin of the Universe. Acceptance rests on the weight of evidence, not on proof beyond all doubt, and the model could be revised if new evidence demanded it.
What earns the marks
- States that the Big Bang theory is the currently accepted model for the origin of the Universe.
- Explains that more evidence supports the Big Bang theory than the Steady State theory.
- Recognises that scientific acceptance depends on the weight of available evidence.
- Contrasts the expanding Universe of the Big Bang with the unchanging Universe of the Steady State theory.
Common mistakes and how to put them right
Claims the Big Bang theory is accepted because it has been proved.
Put it right by saying it is accepted because it is supported by more evidence than the Steady State theory.
States that the Steady State theory is the accepted model.
Put it right by naming the Big Bang as the currently accepted model.
Says acceptance is a matter of opinion.
Put it right by linking acceptance to the weight of supporting evidence.
Describes the Steady State Universe as expanding from a single point.
Put it right by describing it as unchanging over time.
Exam tips
- Look for the option that links acceptance to the amount of supporting evidence.
- Reject options that claim proof or that name the Steady State theory as accepted.
- Recall that the CMB and red-shift are the evidence that favours the Big Bang.
Try the lesson
The start of the Topic 7 – Astronomy: 7.10P Recall that as there is more evidence supporting the Big Bang theory than the Steady State theory, it is the currently accepted model for the origin of the Universe lesson, made from checked teaching notes for this specification point.
Have a go first
Why is the Big Bang theory the model for the origin of the Universe that scientists currently accept?
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