I am interested in a list of mass fractions throughout rocket history. A good answer to this question would be a list of rockets including name(s), country of origin, and mass frac …

Are there any liquids that can exist in hard vacuum, Or does the lack of pressure make all fluids go gaseous?

Background: Seeking to optimize a multimodal orbital launch trajectory and insertion. Considering the use of a turbofan to exploit dense atmosphere near ground rather than waste pr …

I am making an 8.5" mirror. Presently in the final polishing stages. There is a lot of advice on the Internet about correcting various shape defects. But I couldn't find a compreh …

Right now the Ares I-X test vehicle is on the pad and is likely to have its launch scrubbed for the second time. Will launches of Ares I, the crew-carrying vehicle for NASA's Const …

NASA developed the Overflow computational fluid dynamics software for modeling the flow of gases around the space shuttle. Is OpenFOAM a suitable substitute? Can anyone summarize t …

One of the biggest issues with deep space human travel and human orbital missions is the ability to withstand the zero gravity conditions. Will we ever be able to produce gravity …

STS-129 is off and away. I've tagged this as community wiki for discussion on the mission.

Someone has offered to sell me a telescope he made a few years ago. It's a Dobsonian mount, truss-tube reflector. The mirror was purchased from a commercial vendor. It looks like a …