Sunday space: Why is our sun yellow, and what colours are other stars?

By Eloise Birchall
Updated July 1 2021 - 2:47pm, first published January 23 2021 - 5:00pm
A close-up view of the Jewel Box cluster. Several very bright, pale blue supergiant stars, a solitary ruby-red supergiant and a variety of other brilliantly coloured stars are visible, as well as many much fainter ones. Picture: Shutterstock

On Christmas night, my 5-year-old cousin was enjoying his new toy telescope and asked me why a star he was looking at was red.

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