elbowgrease0000
elbowgrease0000 t1_iyxsc7a wrote
Reply to How are we sure that speed of light and other basic constants are really constants on a large cosmological scale of time and space? by The_Dark_Passenger93
not trying to be contrary, here, but....
i was under the impression that the speed of light DOES vary, depending upon the medium its travelling through??
the "speed of light" (c=) constant is actually referring to speed of light in a 'perfect' vacuum only.
right?
and so, i guess, by definition: it must have changed as the density of the universe changed over time with expansion.
right?
i mean, the value for (c) itself wouldn't have changed, but the ACTUAL speed that ACTUAL light was traveling would have changed over BOTH time AND space, as the density of the universe decreased with expansion.
right?
elbowgrease0000 t1_iyycnqp wrote
Reply to comment by The_Dark_Passenger93 in How are we sure that speed of light and other basic constants are really constants on a large cosmological scale of time and space? by The_Dark_Passenger93
ahhh, yeah that's a great way to think about it.
space-time "inflation".
hey, now i understand part of why they call it the "inflationary period", so thanks for helping me to make a connection of understanding, there!
cheers