"Earth's Radiation Belts with Safe Zone Orbit", publisher=Goddard Space Flight Center, NASA [2]Arhivirano 2016-01-13 na Wayback Machine-u, 2009.
nasa.gov
Rachel A.: "Earth's Safe Zone Became Hot Zone During Legendary Solar Storms", publisher=Goddard Space Flight Center, NASA, [3]Arhivirano 2020-08-14 na Wayback Machine-u, 2009.
"Earth's Radiation Belts with Safe Zone Orbit", publisher=Goddard Space Flight Center, NASA [2]Arhivirano 2016-01-13 na Wayback Machine-u, 2009.
Rachel A.: "Earth's Safe Zone Became Hot Zone During Legendary Solar Storms", publisher=Goddard Space Flight Center, NASA, [3]Arhivirano 2020-08-14 na Wayback Machine-u, 2009.