Physics, Astronomy & Cosmology / Re: What's the brightness of a star 16 times wider but half as hot as the Sun?« on: Yesterday at 16:56:51 »
I'd have gone for 16 times.
A sphere with a radius of 1 meter has a surface area of 12.57 square meters. A sphere with a radius of 16 meters has a surface area of 3,216.99 square meters. 3,216.99 divided by 12.57 is 255.926.
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