Did the speed of light change recently?

[Iron Woode]

Originally posted by: MillionaireNextDoor

Originally posted by: Iron Woode

Originally posted by: cr4zymofo

Originally posted by: Kalvin00
I've read that quote 3 times and I still have no idea what the fvck it's trying to tell me.

Read the whole article. Much of what we've come to know today was based on that the speed of light is constant.

So?

....The way we measure it is all screwed up.

Interesting idea. The Iron Woode Theory?

Actually what I was getting at was that the accuracy of its measurement was questionable and therefore seemed to change when it was measured by newer methods.

 

[Heisenberg]

Originally posted by: Astaroth33
Actually, technically speaking, the speed of light does vary depending on the medium it's travelling through. However, I recall the speed of light in a vacuum as the constant. But... indeed, what if it's not constant?

Well, yes and no. The group velocity can vary depending on medium (either faster or slower than c), but the phase velocity is always constant at c. If you try to modulate a signal, it will always travel less than or equal to c no matter the medium. So you can never send information faster than c.