Submitted by Thirdy-DOg t3_10fr5ai in space
Underhill42 t1_j53hdho wrote
Reply to comment by Enorats in Are Two Tidally Locked Earth in One Solar System Possible? by Thirdy-DOg
Keep in mind the moon is only ~1% the mass of the Earth, it's not doing much.
I would imagine the time to tidal locking decreases at *least* linearly with increasing gravity from the "lock-er" (e.g. twice the force = half the time, maybe less. That's normal for most systems), in which case if the moon were Earth-mass, 100x larger, Earth would lock to it 100x faster, and the 50 billion years until tidal locking (~55 with time served) would be closer to 550 million - almost before liquid water appeared on our surface.
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