english: We know that there must be a lot of high-energy electrons in the plane to produce the synchrotron radiation that we see, and we think they're produced by supernova remnants, but there don't seem to be enough.
non_english: Знамо да мора постојати много електрона високе енергије у равни да би се произвело синхротронско зрачење које видимо, а мислимо да их производе остаци супернове, али се чини да их нема довољно.