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Physics, Astronomy & Cosmology / Re: What's the brightness of a star 16 times wider but half as hot as the Sun?
« on: 20/04/2021 21:24:43 »star with 16 times the radius of the Sun would have a surface area 255.926 times as highReally?
I'd have gone for 16 times.
Though there's another complicating factor.
The spectrum emitted will change.
Imagine that the "sun" was at 700K
It would emit virtually no visible light.
But, if you heat it to 1400K it will glow quite brightly.
"Brightness" isn't well defined here.
However, looking at the numbers, I'm pretty sure that the answer they expect is 16.
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