[填空题]
Assume that the nearest st5g6so oze,1rkl0pa *qars t.k1bj pk*:drlr t df4 xbo899to us have an absolute luminosity about the same as the Sun's1:dkxot9k tfj* p4bl.rb d9r 8. Their apparent brightness, however, 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
