Everything You Ever Wanted to Know About the Universe by Newsam Andrew;

Author:Newsam, Andrew;
Language: eng
Format: epub
Publisher: Elliott & Thompson

However, there are a scattering of exceptions, with some stars being both very luminous (much brighter than the Sun) but also quite cool and red, for example. This is because, as we’ve seen, the brightness of a star is related to its size as well as its temperature, so stars that are cooler but bigger can also be very bright, while some stars that are very hot but small can be faint.

We have ended up with three distinct types of star: main sequence stars, which go from small, cool, faint, red stars, right up to very large, hot, bright, blue stars; a smaller number of very bright, large but cool and red stars, very sensibly known as red giants; and small, faint but very hot stars called white dwarfs,* which we detected as telescopes got bigger.

Identifying these three broad types of stars has given us a number of clues about the nature and evolution of stars, and led us to a more complete understanding of their life cycle: how they form, change, evolve and, eventually, ‘die’.

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