What is the primary mechanism causing debris in Low Earth Orbit (LEO) to eventually be removed?

Answer

Atmospheric drag, which causes them to slow down and re-enter the atmosphere

Objects in LEO experience atmospheric drag because the atmosphere is not negligible at those altitudes, which slows them down sufficiently for them to re-enter the atmosphere and burn up harmlessly.

What is the primary mechanism causing debris in Low Earth Orbit (LEO) to eventually be removed?

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