Cosmic rays

Cosmic rays enter the "dark" age (March 2005) - News - PhysicsWeb: "Of the eight sources detected, at least two have no counterparts at radio, optical or X-ray wavelengths. According to the team, these sources could be a new class of 'dark' cosmic accelerators. Moreover, the main particles accelerated in these objects are nucleons rather than electrons as in the more conventional sources."

Cosmic rays are an interesting topic. Usually they are high speed electrons that inhabit space. Of course, some of them are much faster than is supposed to be allowed, but that is a topic in and of itself. And the fact that we found some sources in our own galaxy is great news, but mostly just for astrophysicists. But now we have two sources that are nothing visible - Dark matter perhaps? And they act differently, accelerating nucleons, instead of electrons. Just another peek into the emerging weirdness of deep space - and just how much we have yet to learn.