Re: Why doesn't the sun disappear?
Everyone is right about the sun burning out, but you don't have to start building your own rocket ship to blast you away from the danger. Our Sun is in its main sequence age and is believed to be about 4.5 billion years old, which is also the age of the earth. The Sun is middle-aged. More than 4 million tonnes of matter are converted into energy every second. Our Sun does not have enough mass to explode as a supernova. In about 5 billion years, it will enter a red giant phase, its outer layers will expand as the hydrogen fuel in the core is used up and the core will contract and heat up. Following this red giant phase, intense thermal pulsations will cause the Sun to throw off its outer layers, forming a planetary nebula. The only object that will remain after the outer layers are ejected is the extremely hot stellar core, which will slowly cool and fade as a white dwarf over many billions of years.
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"Matter tells space how to bend, space tells matter how to move." - John Wheeler
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