[Q&A+] Extending the Sun's Life, Moving the Earth Around, Diving Into Uranus' Atmosphere | Q&A 368

How can we theoretically extend the lifespan of the Sun? What would be the best way to change the orbit of the Earth? Would we ever dive into Uranus? And in Q&A+, would Planet 9 even be categorised as a planet, if it's ever found?

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