- #1
Ty1erC
- 10
- 0
I'm trying to fully understand how Cepheid variables are able to give us accurate distance approximations to galaxies. If these galaxies are receding away from us at ever-increasing speeds, wouldn't we notice the variable stars' periods getting longer and longer over time? How can we accurately know these periods and thereby know the stars' luminosities?
Some aspect of this has to be going over my head.
Some aspect of this has to be going over my head.