Activity for justthisonequestion‭

Type	On...	Excerpt	Status	Date
Question	—	How does one calculate the diameter of a 'space fountain'? I need to know how wide the diameter of a space fountain's particle stream is in relation to the mass it's trying to support. It would have to lift its mass at least 40000 kilometers. The vacuum tubes wouldn't necessarily be part of that mass. The planet I'm using it for spins very slowly around it... (more)	—	almost 5 years ago
Question	—	Good explanation for why aliens can't build nuclear engines? "Aliens used uranium and plutonium to generate energy for thousands of years. However, by the time they got into space exploration, they've used up every last bit of it. That's why they'll have to try leaving their high-gravity planet with chemical engines." This sounds good to me, but I fear that ... (more)	—	almost 5 years ago
Question	—	When will the last white dwarfs become black dwarfs? I want my planet to be the last planet in a universe to host life forms. I expect a rough estimation as answer. Thanks. (more)	—	almost 5 years ago
Question	—	How to transform a cells energy source into explosives I'm basically searching for an ATP that can be used to supply cells and also have its energy extracted efficiently into a basic form of explosive material (the stronger the better) without a lot of additional energy being added. I'll need it to explain why my alien species used explosives long befor... (more)	—	almost 5 years ago
Question	—	'Nuke the sky' to make a rocket launch a tiny bit easier My aliens want to build the heaviest chemical rocket possible: They never were much into space travel, since their planets' gravity is about 1.5 of ours. They made lots of bad experiences fighting against gravity and 'decided' to keep their technology on the ground. Suddenly the world's biggest corpo... (more)	—	about 5 years ago
Question	—	What's the limit of my rockets weight? I want to launch the heaviest booster + spaceship possible in about 1.5 of earths gravity, using the technology we currently have. To make things easier, imagine there was the same atmosphere as on earth. Anyways: Is there a weight limit to rockets, where fuel can't be burnt quickly enough to ... (more)	—	about 5 years ago