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The merger took place around 2.2 Billion Light years away OR 2.2 Billion years ago.
In special relativity, the speed of light is constant when measured in any inertial frame. In general relativity, the appropriate generalization is that the speed of light is constant in any freely falling reference frame (in a region small enough that tidal effects can be neglected). In this passage, Einstein is not talking about a freely falling frame, but rather about a frame at rest relative to a source of gravity. In such a frame, the speed of light can differ from c, basically because of the effect of gravity (spacetime curvature) on clocks and rulers.
The redshift-distance connection depends on the mass content of the Universe and the cosmological constant, or dark energy. MAP will determine both of these parameters. The speed of light is constant in a vacuum, but it varies as it penetrates the dust and gas of space. Knowing how much mass is out there, then, will lead to a value for the speed of light in this medium. Dark energy acts to accelerate the expansion of the Universe. The greater the force of dark energy, the faster the acceleration and thus the greater the distance traveled by receding galaxies. So knowing the contribution of dark energy, termed the cosmological constant, places another limit on the redshift-distance connection.
Originally posted by lockheed
So is science in total agreement now that black holes exist without a doubt?