This is the 100 year anniversary of humans having an idea of what the heck the sun and all the stars actually are. If you had asked a leading astronomer in 1925 what the sun was, they would say that it's basically the same as Earth, but very hot.

In Cecilia Payne's doctoral thesis she was the first to say, from spectral data, that the sun was overwhelmingly made of hydrogen and helium.

It was later described as "the most brilliant PhD thesis ever written in astronomy".

https://en.wikipedia.org/wiki/Cecilia_Payne-Gaposchkin

Cecilia Payne-Gaposchkin - Wikipedia

@wikkit We heard a fascinating short lecture on her life in January. It was really inspiring. The length she went through. A true hero of science in my non-sciencey opinion.
@wikkit Great! I'm giving a talk on Saturday and I'll comment on it because Cecilia is one of the women I'm going to mention.
@wikkit So you're telling me the sun is a mass of incandescent gas - a gigantic nuclear furnace - where hydrogen is built into helium at a temperature of millions of degrees.
@wettpaynt @wikkit yes, but we don't know exactly how big they are. For all we know, they might be giants.
@travisfw @wettpaynt @wikkit You got me humming Birdhouse in Your Soul..
@wettpaynt @wikkit I'm saying the sun is a miasma of incandescent plasma.

@wikkit @wettpaynt
The Sun is a miasma of incandescent plasma. The sun's not simply made out of gas.

Forget that song. They got it wrong.
That thesis has been rendered invalid

@quoll @wikkit @wettpaynt Perhaps you should tell them - they might correct it. Katie Melua did with 9 million bicycles... https://youtu.be/iXhxDDY1GYI
Katie Melua - Nine million bicycles (Katies's bad science)

YouTube

@stephenhomewood That's a great video!

You may not realize that my toot is quoting the song where they do just this:
https://youtu.be/sLkGSV9WDMA?si=OSY3I93VeVG5rdAL

They Might Be Giants - Why Does the Sun Really Shine? (The Sun is a Miasma of Incandescent Plasma)

YouTube
@quoll Ahh - I did not realise - that's awesome - thank you 😀

@wikkit Harvard College Observatory director Harlow Shapley sent Payne’s thesis to Princeton’s heavyweight astronomer, Henry Norris Russell, who dismissed her result as “clearly impossible.” Payne dutifully inserted a statement in her thesis that the calculated abundances of hydrogen and helium were “almost certainly not real.”

Within a few years, Russell realized Payne’s calculations were on the mark when his analysis of the data took a different route to the same conclusion. Russell promptly took credit, publishing his finding with barely a nod to Payne. (Princeton for years credited him as the sole discoverer.)

@wikkit dissertation not thesis, right?
@Cayucosine that would be the modern norm. Not sure about 100 years back.

@Cayucosine @wikkit Maybe "dissertation" is the technically correct term according to some authority, I'm not sure, but in practice both are often used interchangeably.

And honestly, I doubt that raising that question will help anyone understand the original toot better.

@wikkit they called it „most brilliant“ and not „most illuminating“ or the like?
Were they even trying?
And thanks, TIL!
@wikkit thanks for highlighting. Found the book The Glass Universe in the references. Will put that on my read list.
https://openlibrary.org/books/OL26210179M/The_glass_universe
@wikkit
"In her autobiography, Payne said that while in school she created an experiment on the efficacy of prayer by dividing her exams in two groups, praying for success only on one, the other one being a scientific control group. She achieved the higher marks in the latter group. Later on, she became an agnostic."
Love this.
@wikkit that sounded like it was going to be a @lowqualityfacts then it turned out to be legit. Nice. I had no idea
@willlll @lowqualityfacts There are more hydrogen atoms in a single molecule of water than there are stars in the entire solar system. 
@wikkit That's an outright lie. Helium was discovered in the mid-19th century in the rays of the solar corona

@liilliil @wikkit

You're correct that helium was discovered in the Sun earlier (and hence the name "helium") but the relative abundances of the Sun were thought to be Earth-like until Payne's research.

That is, astronomers knew there was helium, they just didn't think there was a significant amount.

@wikkit

"she transferred to St. Paul's Girls' School, where her music teacher, Gustav Holst, encouraged her to pursue a career in music. "

That's a neat connection!

I will now think of Cecilia Payne-Gaposchkin when I listen to Holst's "The Planets"

#ClassicalMusic

@wikkit

I can just imagine the stable genius explaining the sun:
“Well. The sun, you know. It’s very hot. And big. Some people say it’s bigger than our planet, but I’m not sure. Have you looked at it? It’s so small. Anyway, it’s very hot. And great for getting a tan. Have you seen my tan? It’s great. Everyone should have a tan. But not brown people. I mean, their skin is really brown and that’s very dangerous.But my tan… that’s how a tan should look.”
D. Trump

@wikkit Thank you for the inspiring information. Cecilia was indeed brilliant.

@wikkit

All very strange as Helium was first identified in the spectrum of the Sun in 1868.

Given it was found there then why did no one join the dots and wonder if the Sun could be made of it also? 😕