Normal bulbs around the world are being replaced with LED (light emitting diodes) which, while they are energy efficient and much cheaper to run, do generate much more light pollution. This means that even though astronauts can see Earth, Earth may not be able to see them. I wonder if it would be different if they gave them a red hue - like the red lighting they use in some centres in the US (and possibly elsewhere) where all the exterior illumination is red, which throws very little light pollution and makes the environment great for star-gazing.
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