# How great could tides be on Earth (or an Earth-like planet) if you swapped the Moon? [closed]

Assuming a planet would have Earth's surface gravity and about the same share of it's surface covered by water, how great could you make tides if you could make the moon bigger, smaller, denser, less dense, closer or farther away as you wished? And would a planet subjected to a bigger pull by it's moon necessarilly be more geologically active or not?

• You're going to need to narrow this down a bit to a specific answerable question, at the moment it's not asking a specific question, more of a bunch really. If you told us what you were trying to achieve, then we maybe can help you get there. May 1, 2020 at 5:13
• In your future attempt to simplify the question, you can forget the density of the Moon. At least as long as the distance between the Moon and the Earth is much larger than the spatial dimensions of both. May 1, 2020 at 5:25
• I liked Slarty's answer. I would like the question to fit that answer. Is there a suggestion for that? Maybe "How great could tides be on Earth if you could make the moon closer or farther away?" Thank you.
May 1, 2020 at 15:21
• According to calculations, backed up by measurements of laser beams bounced off of reflectors left on the Moon by Apollo missions, the moon is slowly receding from the Earth. .The Moon used to be much closer to Earth billions of years ago, and the tides used to be gigantic. skeptoid.com/episodes/4683 Tidal heating of moons of giant planets can cause vulcanic activity,as on Io. Heller, René; Rory Barnes (2012). "Exomoon habitability constrained by illumination and tidal heating". Astrobiology. 13 (1): 18–46. liebertpub.com/doi/10.1089/ast.2012.0859 May 2, 2020 at 17:11
• Thank you, Mr. Golding. I think I got everything I will need.