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Title: Could the Earth-Moon system have shed a large angular momentum excess?
Plain: Some impact scenarios that mix Earth and impactor well leave the system spinning about twice too fast. They work only if a gravitational resonance with the Sun later removed the extra spin.
Precise: High-angular-momentum scenarios (fast-spinning proto-Earth, synestia) require removal of roughly half the post-impact angular momentum, for example by evection resonance capture. Determine whether resonance capture and escape occur for realistic tidal parameters of the early Earth and Moon. An answer is a tidal-evolution calculation giving the angular momentum removed as a function of tidal model, with probability of the required outcome.
Settled by: Coupled orbital and tidal evolution models with self-consistent Earth and Moon dissipation across the plausible parameter range.
Kind: well-posed
Answer type: yes-no
References: (empty)
Literature status: contested
Status note: (empty)
Posed since: (empty)