[RadioAstronomer]

except if space is expanding, in which case your measurement unit fails to be constant, which means that although the speed of light is constant, 186,000 mps is a one-time only measurement of that speed. So you're correct in that c is constant, but our representation in units will change with our units.

The speed of light is invariant in all frames of reference.

[RadioAstronomer]

I should add in a vacuum.

[delta7]

What this article means is that the Bible and Gods word is true and correct but man is not smart enough to figure it out yet(this speed of light is a good beginning).I have been studying the Hubble Red shift for years and what the article does not say is NASA scientists are even in a stir over this-Red Shift-in other words time is changing(speed of light slowing down)-put plainly spoken-the theory of evolution is bunk-carbon 14 dating is bunk-man's explanation is bunk-none of it adds up.Put your trust and faith in Gods word for understanding.Chuck Missler explains the Red Shift so that all of us can understand-but to -buy in- you must first believe in our creator and what he created.We are not a random mistake.

[AdequateMan]

Yes, c is constant, but what if the meters aren't? Wouldn't that alter your method of measuring c?
If space expands, your metric expands, wouldn't your measurement of c in meters appear to change?
I mean that if your method of measuring c is to time its bounce between two objects. If the universe is expanding, wouldn't the distance between the two objects seem to increase from a perspective point outside the universe?
My real question would be does the speed of light depend on the size of space?