Light travels at its fastest in what medium?
Vaccuum Free space Vacuum technology Perfect vacuum Hard Vacuum Existence of the vacuum Vacuum of free space Vacuum (outer space) Vacume Vacuums Vaccum In vacuo Vacuum Physical vacuum Torricellian vacuum Evacuated space Hard vacuum Partial vacuum Vacuum (space) Space vacuum Classical vacuum Vacua Vacuum Technology Vacuo
partial vacuum physical vacuum vacua vacuum outer space hard vacuum vaccum vaccuum vacuums free space existence of vacuum perfect vacuum evacuated space vacuum technology space vacuum classical vacuum torricellian vacuum vacume vacuo vacuum of free space in vacuo vacuum vacuum space
vacuum
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Vacuum