Media outlets claim researchers have created negative mass, but what they really created is negative 'effective' mass, which is a little different. Black Holes And Gravitational Waves Might...
========== By definition, mass is the quantity of matter
that a body contains. But, could there be negative mass? That seems counterintuitive right? How can you have negative two kilograms of
something... Negative mass seems to violate the laws of
our universe… But, in 2014 a couple of excited researchers
did some calculations and found it was A-OKAY. The Universe is fine with negative mass as
long as that mass isn't’ solid. If it’s a fluid, you’re cool.Science pun. So… Negative mass can exist. According to their calculations, a perfect
fluid -- which doesn’t exist -- would allow negative mass to exist and wouldn’t defy
the laws of general relativity! I know that’s complicated, but put a pin
in that for a second. Because just recently in 2017…...