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28 March, 12:25

A star is moving toward the earth with a speed of 0.9 c (90% the speed of light). it emits light, which moves away from the star at the speed of light. relative to us on earth, the speed of the light moving towards us (emitted by the star) is

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  1. 28 March, 12:36
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    The speed of light is constant in ALL frames of reference. That is 2.9 x10^8 m/s (290,000,000 m/s). It is independent of the motion of the light source.
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