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?


What will be the ideal response?


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.


Very useful! Thanks for sharing.