The Sun is slowly getting warmer as it burns the hydrogen in its core. In about 5 billion years, the Sun will begin evolving into a bloated red giant. Its outer gas shell will swell up, engulfing the Earth by the time it reaches its peak size and brightness 7 billion years from now.
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Elementary physics tells us that we actually can move the planets. Launching a rocket into space pushes the Earth a bit in the opposite direction, like the recoil from a gun.
Via New Scientist
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