evolution
Basically, random mutation and natural selection. With a little genetic drift and gene flow thrown into the mix. Evolution, the change in allele frequency over time in a population of organisms.
They go round and round the Sun, they have done that for some billions of years and they will continue for some more billions of years.
Up To Millions And Billions Of years
Yes, white dwarfs are extremely hot when they first form but over billions of years they gradually cool and dim as they release their leftover thermal energy into space. This cooling process is what eventually transforms them into cold, dark celestial objects known as black dwarfs.
evolution
evolution
evolution
evolution
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mass and energy
evolution
evolution
This theoretical process is called Macro-evolution, or just "evolution." Some say that this does not occur beyond the microscopic level, others argue that is does. In any case, DNA had to be created before it could change within a life form.