Thread: Science Stuff...Time travel and stuff.

Slash is right, the constancy of the speed of light is what makes it a limit; special relativity can be derived from this single fact.

I'm not sure about the above post. Certainly I've never heard of any massive particles travelling at light speed, or any massless particles travelling above light speed.

Well I understand light affects everything, so wouldn't it be in relative motion for everything?

I can't make sense of that.

There's no doubt that the speed of light is constant regardless of your velocity, if that's what you're talking about.

Well yeah. I'm saying if there's no light to observe, well you're in the dark.
But if there is light to observe, it must be hitting you, meaning any object hit by light (everything, except for black holes. Even distant star light will hit you from any point in space) is interacting with light, so it must be in relative motion with it.

Originally Posted by Xei

I'm not sure about the above post. Certainly I've never heard of any massive particles travelling at light speed, or any massless particles travelling above light speed.

I was thinking tachyons.

Sheesh, quantum physics is crazy. It seems physics isn't in an advanced enough state yet to work out if tachyons are possible or not, though there's no experimental evidence for them.

Well yeah. I'm saying if there's no light to observe, well you're in the dark.
But if there is light to observe, it must be hitting you, meaning any object hit by light (everything, except for black holes. Even distant star light will hit you from any point in space) is interacting with light, so it must be in relative motion with it.

Well, kind of, I guess. Though I don't think you really need the light to 'hit you' to be sure that it's moving relative to you. There can't be any light anywhere in the universe, regardless of its trajectory, which is not moving with relative velocity to you.

Yeah. What you're saying goes perfectly with what i'm saying. haha.

Light is emitted in all directions. If it weren't, you wouldn't see it.

It's kind of a misconception that light is what Einstein's theory is about. Really, it's about any kind of electromagnetic wave (radiowaves, microwaves, UV, infrared, colours...), not just the light we can see. Electromagnetic waves are the fundamental kind of wave in our universe.