[填空题]
Assume that the neares zy bma:ejyon7ds8z;5gr76 m*t stars to us ha qevwus6k1e+(ve an absolute luminosity about the same as the Sun's. Their apparent brightness, 1(6kvu sqe w+ehowever, is about $10^{-11}$ times fainter than the Sun. From this, estimate the distance to the nearest stars. (Newton did this calculation, although he made a numerical error of a factor of 100.) ly
