Al_'s latest activity

Batteries bad The article linked above says batteries are problematic in space. I propose a flywheel, which is suited to the Lunar...

I think you may be referring to the nausea that is caused by turning your head in a small radius rotating environment. But these...

"ultimate deep freeze at about -100°C." yes but insulation is much easier in vacuum, and so is arranging to expose it to sunlight.

Why hollow out - the reason is delta-V. Why not find mass that is already moving where you want it to. And why rotate them? - find ones...

That sounds comfortable. If I were living that far from home, I'd want comfort. And at least 6 meters of radiation shielding.

Yeah, but they just talk about unicorns. Oops, I didn't mean to end the thread. I like to talk about things that actually could be...

One of them is a near-Earth object. The rest are in the asteroid belt. The asteroid belt could be a source of zero-g materials to an...

TL;DR: Fast rotating asteroids could be rotating habitats Fast rotating asteroids The rotation is so fast that if there were internal...

I meant, as the article says, similar to water worlds. Although of course Earth is not a water world, and Venus has a similar density to...

plate tectonics, and/or convection currents, are not responsible for Earth's magnetic field

Yes, the rocky planets are assumed to have iron-nickel cores - but then why does Venus not have a significant magnetic field? The...

I read the phys.org article - https://phys.org/news/2025-09-soot-planets-common-worlds.html and wondered if Venus could be a soot world...