The Extragalactic Distance Scale

We use many tools to get us out to the farthest reaches of the Cosmos. Herein, we summarize the various ways we learn to measure these gargantuan lengths, using the Cosmic Distance Ladder. This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter. When I originally recorded this in 2018, the Hubble Tension was only just beginning. Now, it's coming to a head, and causing lots of issues....
0:00 Introduction
3:01 Hubble's Law
4:00 Steps to Find the Hubble Parameter Ho
5:25 More on the Leavitt P-L Relationship
7:09 Steps up the Cosmic Distance Ladder
7:41 The Astronomical Unit
8:51 Trigonometric Parallaxes
9:57 Spectroscopic Parallaxes
11:49 Cepheid Variable Stars
14:10 Step 5: Galaxy Standard Candles: Desperation....
15:24 Luminosities of Entire Galaxies
18:57 The Tully-Fisher Relation for Spiral Galaxies
21:48 Redshift Distances
23:11 Critical Measurements for the Cosmic Redshift
24:51 There are still things to work out with H.
27:24 The Big Questions

[@anotherplatypus]

I can't wait to hear you explain the Event Horizon telescope and images of black holes like you explained LIGO and the detection of gravity waves... dunno why, just love the way you do it. = )

[@docsprock7541]

Check out event horizon JMG.... great guests and subject matter

[@docsprock7541]

You just keep pumping out hours of top shelf knowledge Jason... I think it should be mentioned how much time you must have given to aquire such spot on factual subject matter... Also you sound a lot like DR Paul M. Sutter 😂😂😂 a fellow professional Astrophysicist big up DR Sutter 🤘

[@JasonKendallAstronomer]

I appreciate that!

[@giovannilp03]

LETS GOOOOOO

[@icantseethis]

the guy who invented galaxies about to make billions and billions

[@pat8988]

Jason, If higher frequency light is more energetic than lower frequency light, then where does all that energy go when blue light gets shifted to red light when the universe expands?

[@shinten6714]

I don't remember the name of the problem but it's about why galaxies After so much time should have all stopped producing new stars, can you make a video about this because no one is talking about it, please professor.

[@p0lar_bear]

let's go....