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The fate of the entire solar system is difficult to prognosticate. What may eventualy happen with the "gas giant" planets is a very good question, indeed. But as far as the inner, terrestrial planets, the end is easy to describe, as our knowledge in this area is good. The sun is an utterly typical main sequence type K star. In another billion years, it will have expanded somewhat - not a lot, but probably enough to make surface life here on earth untenable (by that time, mankind, or humanity's successor, if one, will have "moved on"). Over the next 3.5 billion years, the outer shell of the sun will get larger and redder, swallowing in sequence Mercury, Venus and ultimately Earth (it may eventually swallow Mars, though that is a "question" area).

Then the sun's core will reach the point where it can no longer convert any elements atomically. It will violently collapse, and blow off the outer shell of gas. Our sun will then appear at a distance exactly like the Ring Nebula in Lyra does today. The core of the sun will be a "white dwarf". Which brings us back to what will happen to the four gas giants. What indeed??

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