When a computer model that takes into consideration the changing solar interior is used to calculate a photon's random walk, what is the re-calculated length of time a photon stays in the sun?
a. 690,000 years 690,000 years, endfragment,
b. 170,000 years 170,000 years, endfragment,
c. 4.6 billion years 4.6 billion years, endfragment,
d. 400 billion years