How are light-years measured
Response to comment [from a Christian]: "...[T]he product of the speed of light..."
Right.
"Einstein recalled how, at the age
of 16, he imagined chasing after a
beam of light and that the thought
experiment had played a memorable
role in his development of special
relativity..."
Chasing a Beam of Light: Einstein's
Most Famous Thought Experiment
"...What about the speed of light, how fast it travels?"
It's God's
speed limit.
Light is fascinating (Gen. 1:3–5).
See:
Let there be Light
(right click, open) by Daryl
Ferguson