"Einstein pulled all of these ideas together in his 1905 theory of special relativity, which postulated that the speed of light was a constant. For this to be true, space and time had to be combined into a single framework that conspired to keep light's
speed the same for all observers."
https://www.livescience.com/space-time.html
"In special relativity, the speed of light remains constant by allowing both space and time to change in such a way as to keep the speed of light constant."
https://coursehero.com/tutors-problems/Physics/28577046-According-to-special-relativity-the-speed-
of-light-is-the-same-for-al/
Michelle Thaller: "All of the universe shifts around this constant, the speed of light."
https://youtube.com/watch?v=DO7J2YIz8tY
Brian Greene: "If space and time did not behave this way, the speed of light would not be constant and would depend on the observer's state of motion. But it is constant; space and time do behave this way. Space and time adjust themselves in an exactly
compensating manner so that observations of light's speed yield the same result, regardless of the observer's velocity."
http://www.pbs.org/wgbh/nova/physics/special-relativity-nutshell.html
Neil deGrasse Tyson, Death by Black Hole: And Other Cosmic Quandaries, pp. 123-124: "If everyone, everywhere and at all times, is to measure the same speed for the beam from your imaginary spacecraft, a number of things have to happen. First of all, as
the speed of your spacecraft increases, the length of everything - you, your measuring devices, your spacecraft - shortens in the direction of motion, as seen by everyone else. Furthermore, your own time slows down exactly enough so that when you haul
out your newly shortened yardstick, you are guaranteed to be duped into measuring the same old constant value for the speed of light. What we have here is a COSMIC CONSPIRACY OF THE HIGHEST ORDER."
https://www.amazon.com/Death-Black-Hole-Cosmic-
Quandaries/dp/039335038X
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