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- The speed of light (in vacuum unless another medium is specified)
1994, Ursula K. Le Guin, A Fisherman of the Inland Sea, Victor Gollancz (UK), published 1996, ISBN 0575602392, page 7:
- If we're going to a world a hundred light-years from here at near lightspeed, we spend according to our own perceptions, only a few minutes doing so and arrive only a few minutes older.
2005, W. Strawn Douglas, Oracle And Other Stories, page 134:
- He paused, then finished, “with the drive from the Linz, he can do over 500 lightspeeds to meet us.
the speed of light