- Keeping air in a giant gravitationally-bound space balloon -Addresses the basic concept of center-caves.
- Amount of material required for a pressure tank - Concluded that structural materials scale directly proportionally to the pressure x volume product with conventional pressure vessels.
- Stress in a thick-walled pressure vessel -Asks how the structural materials would change if the pressurized volume was small compared to the vessel. It seems to be a more restrictive case.
- Attenuation mass-thickness for sunset light - I wanted to get these parameters for the transport of sunlight within large space habitats, and we found them.
- Can a minimum ultimate tensile strength (UTS) for an asteroid be established based on its diameter and rotation? - Turns out that some asteroids rotate so fast that their geosynchronous orbit is effectively below the surface. This is rare, and exclusive to small bodies.
- Effect of water on wobble of rotating structure - Interesting query about management of rotating artificial gravity tubes. Turns out that water will have some very spooky effects, like pushing a half-full jug of milk on the counter. But this isn't necessarily a bad thing.
- Can structural trusses in centrifuges be helpful at all? -Compared the structural requirements of a "barbell" type of artificial gravity structure to a simple ring. Turns out the barbell is easier to build, but for complicated reasons.
Space Exploration (http://space.stackexchange.com/)
- What is the hollow asteroid concept in "Mining the Sky" - A similar concept is purportedly mentioned in this book, although I have yet to find out what that concept is.
- Method to estimate asteroid density based on spectral type -I've started to use the method from my reference here. You have to factor in porosity, which has potential problems, but it's better than using no density estimation routine.
- What stability issues plague long artificial gravity cylinders? -Kalpana One is a recent proposal for a rotating space station, which limits itself to a "stubby" shape. Exactly why was discussed, and I've adopted the design thinking myself.
- How to derive asteroid mass/size estimate from JPL parameters - Absolute magnitude is a measure of brightness of an object from 1 AU, so this gives us a very good estimation of diameter of a spherical object if the albedo is know. Albedo is often not known.
- Full list of asteroids that have been optically imaged as of 2013 - Similar to a post I made on the subject. There turn out to be more than what I gave credit to.
- Theories of what asteroid macroporosity actually means - Some dialogue on the nature of rubble piles. The packing factor is surprisingly low for some asteroids, and this reflects a fairly recent area of research.
- What is the range of strength for asteroidal materials? - I was somewhat thinking that asteroid materials could be used to build structures in space without any processing. Still not sure if that works.
- Are there any theoretical size limits of man-made space stations/structures? - About self-gravitation.
- In space can the difference in temperature between the inside and outside, provide useful energy? - One of my favorite questions. Has lot of interesting implications related to Landauer's Limit and our thermodynamic existence.
- What is the largest naturally occurring body that could be hollowed and safely lived in? - Question sort of converges on the idea of a gravity balloon, although it wasn't intended.