@bunnyknight said
@lemon-lime
When they think they've finally figured out all the waves and particles, they will scratch their heads and ask "now what the heck is TIME and what is TIME made of?"
Drat, I still have trouble explaining what I think time is.
First of all time is not made up of anything, such as little time particles. It's possible a quantum physicist might disagree, but I'd probably be at a loss to understand the particle-wave duality of time no matter how well it's explained.
That was a wee joke by the way. And yes, I know... VERY wee.
Time is motion. And motion can be defined as obects continuously changing position in relation to other objects.
If there was no motion there would be no time. And if time wasn't variable (if it was a constant) there would be no warping of spacetime... in other words, no gravity.
Einstein calling spacetime a 'fabric' was a brillant analogy. Imagine this 'fabric' being woven from threads made of two different fibers... space, and time. One of the fibers is variable and the other isn't.
Now imagine tossing this fabric into the wash. One of the fibers shrinks but the other remains the same length. Because the two fibers are woven together the fabric becomes warped. Curvatures in spacetime are due to time variations, but this is where things can get confusing because some people will tell you gravity causes the time variations which in turn causes curvatures in spacetime.