The particles the fuel gives off, which travel faster than the speed of light in water, can as a result produce a particular type of light, harmless in itself, called Cerenkov radiation.
By smashing particles together at close to light speed inside an atom smasher, scientists created a never-before-seen type of matter: an anti-hypertriton.
One possible explanation for these positrons is the mutual annihilation of the matter and antimatter forms of atype of dark matter called weakly interacting massive particles, also known as WIMPs.