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Light speed is assumed as a constant in Einstein's general relativity theory.In this paper, the polarized light from black hole Cygnus X-1 is found fit wellwith Cherenkov radiation generated by Faster Than Light movement in vacuumunder gravity. Thus, proved the gravitational lens is a real existence, therefractive index of space did increase with the gravity field, and light speedis changeable with gravitational potential energy. Possible experiments todouble verify the theory on the earth is discussed. A new way to find moreadvanced alien civilizations in lower gravitational potential energy area isproposed.

Polarized light from black hole can be a symbol of Cherenkov radiation generated by Faster Than Light movement in vacuum under gravity