The radiation or insanely high tides. You might be safe from drowning if you could get to the top of a mountain.
On the plus side, to be in a stable orbit the earth would need to complete a revolution in something under 5 hours, so you'd be looking at almost five Christmases every day!
(, Tue 22 Sep 2026, 17:10, Reply)
Also the moon would be tugged around a lot more than usual...
Best case scenario would be ejection into wildly different orbits for us and the moon, ideally with the Earth being flung out farther and the moon being swallowed whole.
Seems more likely we'd both turn to lava then hit each other though.
I tried using online Roche calculators but the numbers are too big and my brain is too small.
(, Tue 22 Sep 2026, 18:08, Reply)