Maybe it's just my browser didn't render something right, but I don't think it was meant to say 1020 eV, but rather 10^20 eV. The rest mass of a proton alone is

Maybe it's just my browser didn't render something right, but I don't think it was meant to say 1020 eV, but rather 10^20 eV. The rest mass of a proton alone is on the order of 938,000,000 eV.