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PSR J1748-2446ad is a 32km diameter (you could stack three in our atmosphere), 4×10^30kg mass (twice our sun's) object. It also rotates 716 times per second (24% of the speed of light at its surface).
pulsars are fucking wild en.wikipedia.org/wiki/PSR_J174

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pretty gay personal instance, kinda too lazy to display something here 🌸