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How long will the sun last?

The Sun (and all the planets) started their lives in a giant cloud of cold molecular gas and dust. And then about 4.6 billion years ago, something bumped into the cloud, like the gravity from a passing star, or shock waves from a supernova, causing the cloud to collapse. With the collapse, the mutual gravity from the particles in the cloud pulled together, and formed pockets of denser material in the cloud. These were star forming regions, and one of them was to become the Solar System.

Our Sun is about 4.57 billion years old. About half way through it's life. The Sun will slowly turn into a red giant in about 4.5 billion year and about two billion years later, it will shed it's outer layers and become a white dwarf.

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