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Nearing the end of When the Moon Hits Your Eye by John Scalzi, which came out a few months ago. It's a bit silly but I'd recommend it. The premise can be summed up as, "What would happen if the moon turned into cheese?"
I'll have to check that one out when I finish the Old Man's War series.
I guess...uh...that it'd be less dense, so that'd dick up tides on Earth.
https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html
Mean density (kg/m³): 3344
https://eurekamag.com/research/001/061/001061121.php
At 8 deg C, mean densities of blockformed and conventionally-hooped cheeses were, resp., 1.094 and 1.091 g/ml.
So that's 1094 kg/m³.
Basically, Earth's tides would be about a third as strong, which I imagine would affect a bunch of things, especially coastal ecology. Dunno how much tides affect weather.
Also, probably alters the reflectivity of the Moon, so would affect the brightness of the Moon. Might affect a lot of nocturnal critters and such. Hard to estimate, since that depends a lot on what cheese is involved.
In the book, it kept the same mass and got a lot bigger. And of course much brighter.
Ah, gotcha. What type of cheese did it turn into, out of curiosity?
I think that might be too much of a spoiler 😄