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I have concerns. - Everything falling down and the mess on the floor when this thing has a downtime - The still existing gravity towards the moon, which would

I have concerns. - Everything falling down and the mess on the floor when this thing has a downtime - The still existing gravity towards the moon, which would be a constant additional force pulling you sideways (down) with 1/6 g

SideburnsOfDoom 4y ago
> still existing gravity towards the moon, which would be a constant additional force pulling you sideways That would be why it's a cone not a cylinder, to line up the "subjective down", the sum of forces including lunar 1/6 g; with the direction that the ground is in. Stopping would be an issue. But it looks like there is some accommodation for that in the form of a big "bathtub" at the bottom that could hold the water. IDK why there's so much water in the first place though.
msk-lywenn 4y ago
You mean everything fall left* and do a big mess on the wall, right? Frames of reference are fun. We also have a force pulling us sideways on Earth since it's rotating but without doing the math, it's probably a lot lower than 1/6 g, indeed. * or right, no idea if this is spinning clockwise or anti-clockwise.
- Akronymus 4y ago
  And no matter which direction it spins, it depends on which direction you look. if you are looking "upwards" it falls "backwards", "downwards" = "forwards" and so on.
yellowapple 4y ago
The Moon's "atmosphere" is (practically) frictionless, so if you build this thing with a similarly-frictionless bearing (e.g. really strong magnets) it could theoretically spin near-indefinitely. Whether that's actually achievable (while still allowing people and supplies and water and oxygen and such to enter and exit) is of course another question.
unsupp0rted 4y ago
I wonder what it would do to human biology to have 1 g pulling us down as we evolved to handle, but also 1/6 g pulling us sideways. I guess it would cause all sorts of balance and medical issues.
- SideburnsOfDoom 4y ago
  > 1 g pulling us down as we evolved to handle, but also 1/6 g pulling us sideways. Look at the design, with the surface not vertical but at a steep angle inward. It's pretty clearly designed to produce a total perceived weight equivalent to 1g, composed of 1/6 g downwards caused by the moon, and I suppose 5/6 g sideways caused by rotation. The floor is at an angle that works with the sum of these forces. Having said that, "spin gravity" isn't always comfortable, it depends on how large and how fast it is: https://space.stackexchange.com/questions/9575/mitigating-nausea-when-generating-artificial-gravity-by-centrifuge https://space.stackexchange.com/questions/9575/mitigating-na... This structure looks easily big enough to be out of danger, at 3rpm and 100m radius.

SideburnsOfDoom 4y ago

> still existing gravity towards the moon, which would be a constant additional force pulling you sideways That would be why it's a cone not a cylinder, to line up the "subjective down", the sum of forces including lunar 1/6 g; with the direction that the ground is in. Stopping would be an issue. But it looks like there is some accommodation for that in the form of a big "bathtub" at the bottom that could hold the water. IDK why there's so much water in the first place though.

msk-lywenn 4y ago

You mean everything fall left* and do a big mess on the wall, right? Frames of reference are fun. We also have a force pulling us sideways on Earth since it's rotating but without doing the math, it's probably a lot lower than 1/6 g, indeed. * or right, no idea if this is spinning clockwise or anti-clockwise.

Akronymus 4y ago
And no matter which direction it spins, it depends on which direction you look. if you are looking "upwards" it falls "backwards", "downwards" = "forwards" and so on.

yellowapple 4y ago

The Moon's "atmosphere" is (practically) frictionless, so if you build this thing with a similarly-frictionless bearing (e.g. really strong magnets) it could theoretically spin near-indefinitely. Whether that's actually achievable (while still allowing people and supplies and water and oxygen and such to enter and exit) is of course another question.

unsupp0rted 4y ago

I wonder what it would do to human biology to have 1 g pulling us down as we evolved to handle, but also 1/6 g pulling us sideways. I guess it would cause all sorts of balance and medical issues.

SideburnsOfDoom 4y ago
> 1 g pulling us down as we evolved to handle, but also 1/6 g pulling us sideways. Look at the design, with the surface not vertical but at a steep angle inward. It's pretty clearly designed to produce a total perceived weight equivalent to 1g, composed of 1/6 g downwards caused by the moon, and I suppose 5/6 g sideways caused by rotation. The floor is at an angle that works with the sum of these forces. Having said that, "spin gravity" isn't always comfortable, it depends on how large and how fast it is: https://space.stackexchange.com/questions/9575/mitigating-nausea-when-generating-artificial-gravity-by-centrifuge https://space.stackexchange.com/questions/9575/mitigating-na... This structure looks easily big enough to be out of danger, at 3rpm and 100m radius.