Posted: Mar 24, 2017 7:05 pm
by jamest
newolder wrote:
I'm easily confused. Could you ask the question again, please?

If it's the one about measuring distances to galaxies then that concerns finding 'standard candles' that shine equally in all galaxies.

This leads me to ask another question (sorry squire!) : apparently red-shifted light has less energy, so why would these standard candles not vary in brightness according to distance - assuming brightness correlates with light-energy?