Kurzgesagt – In a Nutshell

What Happens if the Moon Crashes into Earth?

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After the Moon disintegrated, its rubble would form a massive ring system while lunar dust created meteor showers.
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At geosynchronous altitude, the Moon would appear fixed above one location, completing its full phase cycle every 24 hours.
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Crossing roughly 10,000 kilometers from Earth would carry the Moon past the Roche limit and tear it into rubble.
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At roughly 75,000 kilometers from Earth, the Moon would illuminate the night sky like twilight.
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Tidal bores could reverse rivers, carrying salt water into surface and groundwater supplies.
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Earth's surface gravity is about six times stronger than the Moon's, so a nearby Moon would not lift people.
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As the Moon nears, its gravity warps satellite orbits until exhausted correction fuel leaves satellites uncontrollable.
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Volcanic aerosols and eclipses could plunge Earth into rapid cooling, acid rain, and summers with snow.
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When ports and coastal refineries become unusable, shipping stops and countries depend on existing stocks and rationing.
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An orbit is continuous sideways falling: speed curves an object around Earth instead of letting it collide.
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To change an object's orbit, change its speed. Gravity then carries it along a different path.
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After civilization collapses, survivors emerging from submarines, bunkers, or mountaintops would face rebuilding without guaranteed success.

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