Compared with intergalactic space, our galaxy is gravitationally dense. Compared with interstellar space, our solar system is gravitationally dense. We know that light waves bend with gravitational compression of space. How do we know that our “speed of light in a vacuum” isn’t slower in solar space because of all the nearby objects creating drag than it would be in intergalactic space which is gravitationally sparse by comparison?

from Forbes – Tech http://ift.tt/1S0h86r
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