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THE SKY GUY: Star colours and variability  

Why choose these two star topics?

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I mean, stars are white, aren’t they? And clearly, they are always the same brightness.

The stars themselves are actually a little redder or slightly blue, but these are very delicate hues, which are caused by the star’s temperature. If we look at the element on an electric stove, we can clearly see that its colour changes as it heats up when turned on. We don’t turn stars on, but their surface temperatures vary. Some stars are much hotter than others.

To help you remember this temperature range,........

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