. "speed of light"^^ . "speed of light"@en-us . "15284285-n"^^ . . . . "0"^^ . . "c"@en-us . . "114419522"@en-us . . . "115284285"^^ . . . . "the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second"@en-us . . "110979332"@en-us . "light speed"@en-us . . . "0"^^ . . . .