I have given up communication with Bjarne, but I notice other people are using this thread, and some of the questions discussed are quite interesting, once we clear away the fog of misconceptions and megalomania.
The main fault with people, like Bjarne and that guy on You Tube, when they try to understand/refute SR is that they don't get the whole picture. For instance, Bjarne focuses on the speed - time dilation relationship, and gets confused. However, the point of relativity is exactly that speed makes only sense in comparison with a reference.
Imagine an object in an otherwise empty universe. Let us assume it is a space ship, and call it A.
Q: How fast is A moving?
A: Indeterminable. There is nothing to measure it against.
Now we start the rocket engines, and accelerate to 30,000km/s.
Q: How fast is A moving now?
A: 30,000km/s faster than before. (That is 0.1c, thus A is now slightly heavier than before, and the on board clock ticks slightly slower). However, for an observer ignorant of the fact that the engines have been firing, everything will be the same as before. There will be no way to determine A's speed.
OK, actually A was not quite alone in that universe, because there is another spaceship, B, which some time ago
also accelerated to 30,000km/s, but in the opposite direction. Not only that, but there is a 3rd ship, C, which hasn't done anything, it basically just sits there.
Now we have a configuration similar to the way most people understood Bjarne's drawing: A and B speed by C in opposite directions (I have chosen more moderate velocities, so we can ignore relativistic effects and just add them linearly)
Q: So what does each party observe?
A: C observes A and B speed by in opposite directions at 30,000km/s. C's clock ticks a little faster than A's and B's, which tick at the same speed.
A observes C speeding by at 30,000km/s and B speeding by at 60,000km/s. A observes C's clock ticking a bit faster than its own, and B's clock is the same as its own.
B observes the same as A, except, of course the other way around.
Wait! How can C's clock be faster than A's when A observes C to move at 30,000km/s?
It is really quite simple: Nobody's clock changes because of another
observer. What causes the relativistic time dilation (and mass increase) is the objects
own velocity, within its reference frame. What direction it moves, and what other objects do is entirely irrelevant.
Stay tuned, next time I'll cover redshift
Hans
!
: This assumption is wrong. Cows may come out of the corners, but space doesn't. 