describing partly random or chaotic phenomena such as crystal growth and galaxy formation.
All stars – like all suns and galaxies – are composed of hydrogen and helium, the two elements that are necessary for the formation of stars. In stars, hydrogen evaporates as helium is made, but the two are attracted to each other very strongly in the core. (This is why they look very similar to each other: for hydrogen, oxygen and silicon atoms, these are familiar elements that you can buy or borrow. For helium, however, these are exotic elements called baryons that cannot be found in nature).
The original H-alpha emission came from the hydrogen-helium core of a star with temperatures below 5 million degrees Celsius.
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