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Alfonso asked the Naked Scientists: Question regarding speed of light and distance to stars. Please correct me: If a star or a galaxy is, letīs say, 2.5 million light years from the Earth, its light will take 2.5 million light years to reach us. But under that period of time, the universe would have expanded and the origin of that light would be further away from us. How does this affect the calculations of the astronomers regarding the distance of celestial objects? Thank you for the programmeWhat do you think?