The star-Cephei, which lies 300 pc from Earth, is thousands of times more luminous than the Sun. Thanks to this great luminosity, stars like -Cephei can be seen in galaxies millions of parsecs away. For example, the Hubble Space Telescope has detected stars like -Cephei in NGC 3351 galaxy, which lies in the direction of the constellation Leo. These stars appear 9 x 10^-10 as bright as -Cephei. What is the distance to NGC 3351?

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