Then there was a wild yelp of agony and the poodle went sailing up the aisle; the yelps continued, and so did the dog; he crossed the house in front of the altar; he flew down the other aisle; he crossed before the doors; he clamored up the home-stretch; his anguish grew with his progress, till presently he was but a woolly comet moving in its orbit with the gleam and the speed of light.
There are no more uses of "speed of light" in the book.
Show samples from other sources
Some theorize particles called tachyons can travel faster than the speed of light, but others disagree.
I’m falling faster than the speed of light into the black hole that opened with the Arrival and then devoured everything in its path.