© NASA
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 density of matter in deep space is very low, but there are sufficient atoms for the idea of temperature to make sense. However, the intensity of radiation from stars is very low in the regions of space between stars and galaxies due to the inverse square law. Nevertheless, the universe has a temperature due to the cosmic microwave radiation left over from the Big Bang, and this radiation can tell us about the expansion of the universe.
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