Activity for TPK‭

Type	On...	Excerpt	Status	Date
Question	—	How much liquid hydrogen to stop neutron radiation? I have a spaceship that's powered by an efficient hydrogen fusion drive, but the drive outputs a large amount of dangerous neutron radiation as a side effect, and those neutrons are not captured and directed away from the ship by its magnetic nozzle. Fortunately, my research indicates that hydrogen-... (more)	—	over 6 years ago
Question	—	Does my Fast-as-Light travel method run afoul of causality or relativity? I am writing a hard science fiction story and I want to avoid violating known physics, while still enabling some of the classic mainstays of science fiction under the auspice of sufficiently advanced engineering. To that end, I have developed a method of interstellar travel that I believe avoids vio... (more)	—	over 6 years ago
Question	—	Using Solid Oxygen for a Rebreather I'm designing an environment suit for humans to wear while interacting with a benevolent alien species while in alien space. Here's my question: How much solid oxygen (by mass and volume) it would take to allow for six hours of comfortable, low-stress breathing by an average-sized human? These are... (more)	—	about 7 years ago