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Reminds me of the concept of negative mass matter as dark matter. That would make getting hit by it very difficult as it repels and is repelled by regular matte
by Nasrudith 7y ago
Reminds me of the concept of negative mass matter as dark matter. That would make getting hit by it very difficult as it repels and is repelled by regular matter and thus would constantly flee all normal mass. Not sure it would be very consistent with the observed universe though.
- a1369209993 7y agoActually, a: negative mass would have the opposite effect as dark matter - gravitationally repelling all nearby matter - so you'd need even more dark matter to make up for it; b: negative mass is actually attracted to positive mass[0], so quantaties of dark negative mass small enough to not have noticable gravitational effects would follow the same orbital trajectories as positive dark matter. 0: Eg, if you have two particles with equal and oppositely-signed mass in otherwise free space, they'll "fall" in the direction of the positive particle. The two-particle system has zero mass, zero kinetic energy and zero force driving its accelleration, which could be taken as a pretty good argument that negative-mass particles don't actually exist.
- anchpop 7y agoDoes this mean if you had a rock of negative-mass and a rock of positive mass in space they would chase each other?
- a1369209993 7y agoYes; see second paragraph. It's probably highly unstable if there are any other gravity sources involved, but I don't have a good physics simulator on hand to check.