 በእሱ ጊዜ ኤንሪኮ ፈርሚ (1901 - 1954) ወደ ፔታቮልት ለመድረስ ፈጣኑ በምድር ዙሪያ መሄድ እንዳለበት ገምቷል ።
In his time, Enrico Fermi (1901-1954) estimated that, in order to reach the petavolt, the accelerator would have to go around the Earth.