Earth's New "Moon" 101

The video explores why Earth has only one permanent moon while gas giants have many. It introduces Earth's temporary second moon, 2020 CD 3, a captured asteroid expected to leave Earth's orbit soon. The concept of quasi satellites, which orbit the Sun but are influenced by Earth's gravity, is explained. The video also discusses the Hill sphere, a region where a planet's gravity dominates over the Sun's, affecting moon capture. Finally, it highlights the challenges Earth faces in permanently capturing moons due to its smaller Hill sphere compared to gas giants.

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