The Hertzsprung Russell Diagram

This is the most fundamental tool in all of astrophysics. It cannot be understated that this tool basically invented astrophysics, and can even be replicated with amateur-class telescopes. This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
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Luminosity/Radius/Temperature Relation: en.wikipedia.o...
Johnson Filter System: en.wikipedia.o...
Hertzsprung-Russell diagram: en.wikipedia.o...
Luminosity Classes: en.wikipedia.o...
ESA's Gaia Mission: sci.esa.int/gaia
ESA's Hipparcos: en.wikipedia.o...
Gaia's Hertzsprung-Russell diagram: sci.esa.int/gai...

[@TaylrTownsnd]

I have to say; your keyframe animation of sorting a given cluster by colour and then magnitude, is the most sensible and intuitive way of visualising how this graph is constructed I've seen.
It never really clicked how the shape came about until seeing it in one of your feature length compilations some time ago and again here.
Big fan of your work from Australia!

[@barneysmith5592]

Great explanation

[@JasonKendallAstronomer]

Glad you liked it

[@jeremycraft8452]

I ❤ your videos. Thank you.
At 5:17, you discuss luminosity of stars, and how “brightness” depends on distance, then at 8:26, you discuss how “brightness” is used to determine temperature. Can luminosity be used to determine temperature?

[@jeremycraft8452]

Also near 8:20 you refer to B (blue) filters, R (red) filters, and V filters. What’s the V stand for?

[@jeremycraft8452]

Then at 11:00, you say the “brightest” stars go on top. Is that the same as “most luminous?”