Oddbean new post about login | logout @b4c50e1b well that's a first step. now: does antimatter MAKE gravitational fields just like matter does? i guess if energy can, so does anitmatter? still should test. will need several grams of antihydrogen to test that i think.
@f604b7a1 - again the answer is obvious from the laws of physics: yes, antimatter makes gravity. But again, testing it will be major nuisance. The lightest object whose gravity we've deteted is a 90-milligram gold sphere: https://arstechnica.com/science/2023/09/antimatter-falls-downward-not-upward-just-like-regular-matter/ But it was shaken back and forth, not easy to do with antimatter! And antimatter currently costs about $60 billion per microgram, which would be $5.4 quadrillion for 90 micrograms. Even worse, that quoted price is for antiprotons, which wouldn't work: antihydrogen would cost even more! https://en.wikipedia.org/wiki/Antimatter_weapon