There’s actually very little solid matter in space, so transmitting signals a long distance doesn’t pose much of a problem. Radio waves (via which information is transmitted from satellites) travel at the speed of light, but it takes a relatively long “section” of wave to encode data, and images require a lot of data, so even though the waves travel quickly, it still takes a while to receive a complete image. Once the signal gets closer to Earth, it may be relayed to other satellites for easier transfer through the atmosphere.
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