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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
The universe was formed in the Big Bang. At this time matter and antimatter particles were created in equal amounts. The Standard Model of particle physics suggests that matter and antimatter should have annihilated to form a universe filled only with radiation. However, for reasons not understood currently, the universe contains more matter than antimatter – there is a baryon asymmetry.
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