Is there molecular hydrogen in the Sun's atmosphere? If so, how much, and how was that first determined and measured?
What was the "optical illusion" that led to erroneous metal concentrations in stellar atmospheres in the galactic center?
At what point does an astronomical body's surface stop being gas giant-like and start being sun-like?
The sun "burns" hydrogen and even has "campfires" on it, but has anyone calculated a rate of actual chemical burning on the Sun?
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