Matter with negative mass, a seeming impossibility, could actually have existed in the early universe, a new study shows. A novel solution to Einstein’s equations for gravity permits the ...

Washington State University physicists have created a fluid with negative mass, which is exactly what it sounds like. Push it, and unlike every physical object in the world we know, it doesn't ...

Because you could use negative-mass apples to build warp drives, travel in time, and construct a perpetual motion machine. In fact that last one will be today’s actual challenge question.

In our everyday experience, if you push something, it moves away from you. But objects with negative mass would turn that basic principle on its head and accelerate towards you instead. It sounds ...

A negative mass Newtonian apple would fall down to Earth just like a positive mass apple, he points out. But on a negative mass planet, both positive and negative mass apples would “fall” up.

A few days ago, I spotted a strange title on a physics paper, claiming to have produced negative mass. I gave it a read. No they didn’t, I thought to ...

However, string theory does suggest that the energy in empty space must be negative, which corroborates the theoretical expectations for a negative mass dark fluid.

A surprise observation of negative mass in exciton–polaritons has added yet another dimension of weirdness to these strange light-matter hybrid particles.

Physicists have created a fluid with negative mass, which is exactly what it sounds like. Push it, and unlike every physical object in the world we know, it doesn't accelerate in the direction it ...