San Lumen wrote:Valrifell wrote:
People who thought the Earth was the center of the universe lacked conflicting evidence to the contrary, and it seemed quite obvious given how rotations work. But actually, even 1500 years ago people were challenging the idea of the central Earth because there were things that didn't make sense, like "orbits" that appeared to go backwards across the sky.
500 years ago nobody actually thought the Earth was flat, that's a myth perpetuated for some reason. Eratosthenes famously calculated (with a high degree of precision) the circumference of the Earth with some shadows in Egypt, this was 2,000 years ago, because of conflicting evidence to the idea of the central Earth.
Wait... are you... quoting a movie at me.
There's significant experimental data to corroborate Einstein and Maxwell's ideas and none to challenge it on large scales. Gravitational lensing is a direct byproduct of the universe's insistence that the speed of light be constant everywhere for everyone.
No one is saying the speed of light isnt constant. But what's to say alien races haven't figured out how to travel faster?
Because the invariance of the speed of light is why you can't travel faster than it.
If you're moving .8c and shine a flashlight, the light will still appear to be moving at c from your frame, but it will also be moving at c for a stationary observer. Things like length contraction and time dilation (which, again, experimentally confirmed) also point towards the idea of the speed of light being ubeatable.








