COSMIC MICROWAVE BACKGROUND (CMB) RADIATION
2 marks · NormalDescribe two pieces of evidence that support the Big Bang theory.
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Also accept: expanding universe as measured by red-shift and CMB radiation
Common mistakes: saying 'gravity' or 'stars exist' as evidence
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Marking points
B1 · 1 mark · States observation of red-shift for most galaxies or universe expansion.
B2 · 1 mark · Mentions cosmic microwave background (CMB) radiation detected everywhere.
Worked solution
Two pieces of evidence are: (1) most galaxies show red-shift, meaning they are moving away, which indicates the universe is expanding; (2) the cosmic microwave background radiation is observed in all directions, as a leftover from the Big Bang.