Hills swelling above each other; and undulations shapely and uncouth, smooth and rugged, graceful and grotesque, thrown negligently side by side, bounded the view in each direction; while frequently, with unexpected noise, there uprose from the ground a flight of crows, who, cawing and wheeling round the nearest hills, as if uncertain of their course, suddenly poised themselves upon the wing and skimmed down the long vista of some opening valley, with the speed of light itself.
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.