[填空题]
Assume that the nearest stars to us u -n2f7l2pdcx g5 *5p+cmyehr have an absolute luminosity about the sai/o rs3e b*3ssme as the Sun's. Their appae s3sr */bio3srent 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
