Astronomy - Measuring Distance, Size, and Luminosity (12 of 30) Luminosity and Size

[@joneslu1377]

Nothing on KZbin can be compared to this series of lectures in explaining everything down to examples, equations, and mathematical operations! Absolutely the best! I guess maybe we are going to touch standard candles next to determine distances of stars?

[@mezji1527]

why we divided by 16? when we already assumed that the Ly= 16Lr then we again assumed Ly= 48Lr?

[@MichelvanBiezen]

If the temperature of one star is half the temperature of another star, the light emitted by that star is 1/2^4 = 1/16 time the amount of light compared to the other star.

[@mezji1527]

what about the 48 ?

[@MichelvanBiezen]

3 x 16 = 48 which means that the star is twice as hot and has 3 times the surface area.

[@bigbrothersinnerparty297]

@Anna Sui it is the scenario itself. The question itselfs states it.

[@0219-n1e]

Great stuff : ) ... One big problem >: I