Question
Evaluate the evidence for the Big Bang theory of the origin of the universe.
Mark scheme (6 marks — levels):
- Level 3 (5–6): Detailed and balanced. Explains red-shift of distant galaxies (light from receding galaxies shifted to longer wavelengths) showing the universe is expanding. Refers to the Cosmic Microwave Background (CMB) radiation as the cooled remnant of high-energy radiation from the early universe. Considers strengths (consistent with Hubble's observations; CMB temperature ≈ 2.7 K matches predictions) and limitations (does not explain what caused the Big Bang; alternatives like Steady State theory rejected because they cannot account for CMB). Reaches a justified conclusion.
- Level 2 (3–4): Describes red-shift and CMB but with limited evaluation; conclusion partial.
- Level 1 (1–2): Simple statements (e.g. "galaxies are moving apart") with no evaluation.
- Level 0 (0): No relevant content.
6 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.