The null result of the Michelson-Morley experiment could be explained if the speed of light depended on the motion of the source relative to the observer. Consider a binary eclipsing star system, that is, a pair of stars orbiting their common center of mass with Earth lying in the orbital plane of the system, as is very nearly the case for the binary system Algol (see the More section). Assume that the stars in the system have circular orbits with a period of 115 days and that one of the star’s orbital speeds is 32 km/s (about the same as Earth’s orbital speed around the Sun). If the suggestion above were true, astronomers would simultaneously see two images of the star in opposition, that is, on opposite sides of its orbit. What is the minimum distance L from Earth to the binary for this phenomenon to occur?