[填空题]
Two stars 15 light-y6 rnlzsx;d:p ,9 9tdawrgkjfs:,-g u+ears away are barely resolved by a 55-$cm$ (mirror diameter) telescope. How far apart are the stars? Assume $\lambda=550\mathrm{~nm.}$ and that the resolution is limited by diffraction. $ \times10^{11 }\;m$
