The moon is getting slightly farther away from the Earth each year — a physicist explains why

Scientists measure the distance to the Moon by bouncing lasers off mirrors placed there by space probes and astronauts.
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The Earth's celestial companion, the moon, is drifting away from us

Every year, the moon, Earth's reliable celestial companion for 4.5 billion years, is getting 1.5 inches away. The distance to the moon is calculated by measuring the amount of time it takes for light ...