Why does Earth need rotation for gravity- either for the plot or for real? Gravity didn't need rotation when I was at schoolStarted watching 'Wandering Earth'. It's a big grossing Chinese Scfi film that's come on Netflix. Fortunately it's dubbed.
Only got 20 minutes in but it's fantastically far fetched. The sun is on the verge of exploding, so rather than wait for the inevitable, we build 'earth engines' and decide to 'fly' earth off into space ! Most folk live under ground. One slight issue is they have forgotten that earth needs rotation for gravity, but the engines are on one side.
What could possibly go wrong ?