Problem: A distant galaxy is moving away from the Milky Way at a speed of 0.8 c. If the galaxy ejects some material at a velocity of 0.9 c towards the Earth, measured by astronomers, how fast is the material moving relative to the distant galaxy?

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A distant galaxy is moving away from the Milky Way at a speed of 0.8 c. If the galaxy ejects some material at a velocity of 0.9 c towards the Earth, measured by astronomers, how fast is the material moving relative to the distant galaxy?

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