Why does the Sun usually appear white to the human eye? How do stars that are cooler, hotter, and about the same temperature compare to the Sun?


#1

What will be the ideal response?


#2

ANSWER: Because the Sun radiates almost half of its energy as visible light, all visible wavelengths from the midday Sun reach the cones, and the Sun usually appears nearly white. A star that is cooler than our Sun radiates most of its energy at slightly longer wavelengths; therefore, it appears redder. On the other hand, a star much hotter than our Sun radiates more energy at shorter wavelengths and thus appears bluer. A star whose temperature is about the same as the Sun’s appears white.


#3

Very useful! Thanks for sharing.