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Oct 7, 2020 at 21:34 comment added notovny @bta Even moving it very fast has negligible effect on the Moon. From the moon's point of view, the barycenter is still in almost exactly the same direction as it was before and moving the barycenter that little doesn't make the orbit unstable. If there are any astronomers left alive after all the water on Earth was sent hurtling to one point, they may notice the slight change in the Moon's orbit, but it's not bringing down the Moon.
Oct 7, 2020 at 20:50 comment added bta @notovny - I didn't do the math, but I'm willing to bet that you could cause problems much faster than that if you were trying. Not normal-strength tides, but rapidly moving the entire mass of the oceans to a single, high-altitude point to shift the Earth/moon system's barycenter. Less gentle tug, more yank.
Oct 7, 2020 at 20:23 comment added notovny @bta The original question makes it seem like she's in a bit of a hurry, and wouldn't want to take a few billion years manipulating the tidal bulge to crank the Moon back in.
Oct 7, 2020 at 19:59 comment added Atog Ahh, i didnt even think of trying to get the moon to collide.
Oct 7, 2020 at 19:48 comment added bta I like it, a reverse tide. Move the water around to tug at the moon instead of vice versa.
Oct 6, 2020 at 22:30 comment added notovny "Spiraling into the sun" doesn't happen without another force acting (or gravitational wave emission, but ain't nobody got time for that on the planetary scale). To get the Earth to fall into the Sun, you need to change its orbit to put its perihelion below the surface of the Sun, and that's difficult. In fact, it's easier to make Earth escape the solar system entirely.
Oct 6, 2020 at 19:37 history answered Atog CC BY-SA 4.0