Question

At one stage during its birth, the protosun had a luminosity of 1000 L_sun and a surface temperature of about 1000 K. At this time, what was its radius? Express your answer in three ways: as a multiple of the Sun’s current radius, in kilometers, and in AU.

Answer 1

Using T = 5800k, we have that,

R/R.=( T/T.)^2=L/L.= (5800/1000)^2= 1.1 ×10^3. Of the suns radius.