The trouble is, Gemini, you keep discovering the same thing: nobody and nothing is perfect.


According to the Standard Model of particle physics, the universe should be empty. Matter and antimatter, which are identical except for their opposite electric charges, seem to be produced in equal parts during particle interactions and decays. However, matter and antimatter instantly annihilate each other upon contact, and so equal amounts of each would have meant a wholesale annihilation of both shortly after the Big Bang. The existence of galaxies, planets and people illustrates that somehow, a small surplus of matter survived this canceling process. If that hadn’t happened, “the universe would be void,” Schönert said.

The explanation for the survival of some matter may lie in subatomic particles called neutrinos. These particles might have a special property that would give rise to neutrino-less double beta decay.

{ Quanta | Continue reading }

Marty McFly: [referring to Alternate 1985 Biff] How could he be your husband?


Speed of light experiments measure the average speed to a destination and back, leaving open the possibility that the speed may differ over each leg.

{ The Physics arXiv Blog | Continue reading }