IOAA 2011, theory — Задача 9

*Short theoretical questions

Each question max 10 points*

Условие

9. Interstellar distances are large compared to the sizes of stars. Thus, stellar clusters and galaxies

which do not contain diffuse matter essentially do not obscure objects behind them. Estimate what proportion of the sky is obscured by stars when we look in the direction of a galaxy of surface brightness $\mu = 18.0\ \mathrm{mag\ arcsec^{-2}}$. Assume that the galaxy consists of stars similar to the Sun.

Решение

Оригинал в Архива: 2011_Short_Questions.pdf