Light reflected from Earth, especially the faint illumination of the dark side of the Moon caused by sunlight bouncing off Earth.
Compound of 'earth' and 'light.' A modern astronomical term describing a specific optical phenomenon observed in space.
Astronauts describe 'earthlight' on the lunar surface as heartbreakingly beautiful—our pale blue planet glowing in the black sky is often what makes them truly understand Earth's fragility and isolation.
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