[ricardo81]

One thing I've always admired as a Layman about astronomy, is all the eloquent deductions they've been able to make that adds another framework of ways to discover new information, particularly the discovery of Cepheids.

Obviously the engineering side is also as impressive, being able to look at objects light years away and using the paltry several hundred million miles our Earth orbit takes us around the sun as a means of information discovery.

[cma]

Good overview here: https://en.wikipedia.org/wiki/Cosmic_distance_ladder

More: https://www.math.ucla.edu/~tao/preprints/Slides/Cosmic%20Dis...

https://terrytao.wordpress.com/2020/10/10/climbing-the-cosmi...

[ricardo81]

Really enjoyed the math.ucla.edu link, good pace for me. Thanks.