Will each moon have differing gravities?
TL;DRBrian Chambers doesn't know whether the moons will have different gravity, calling it a design question, though the speakers expect plenty of variation across the many planets and moons overall.
That would be for design. It's more of a design question. I know there was talk of that, but I don't know where it's settled. I've been involved in conversations which are incredibly deep and interesting, even as far as weight and mass and how you're coming in from the atmosphere and how you're coming down and the difference between the volume you have and the weight you have and the speed that you've started at and so on. So there's been a lot of detail and discussion that's gone into that, but I'm not sure on specific gravity if they'll differ.
And of course, these are the first three moons out of hundreds of moons that we have. So even if there isn't a tremendous variation on these particular three that are all orbiting the same gas giant, as more and more come online, I think if there's 100 star systems, there's probably somewhere around 325, 350 planets.
That's right around the number that I've read a couple times across design.
And that's just planets. So then you add the moons. There's going to be plenty of variation, even if it's not in these.
Absolutely. And then think of the future ones, too, when you get some more of the alien types and some of the even further out ones, the gas planets and this and that. The differentials that we're going to have will be fairly drastic, I would imagine.