I have been thinking about this for a while, and I am not sure about how I can visualize this. Lets imagine that there can exist clouds of primordial matter, far away in space. 1. Can it be possible for a cloud to exist and be made out of strictly protons at 0 kelvins? I don't suspect they would be very visible, as no electrons would be around to emit EM radiation. I have heard that even protons can emit EM radiation at high velocity, and even in a collision, but at 0K in a cloud with little to know kinetic energy, 2. Would something like this be detectable?