Activity for Philipp‭

Type	On...	Excerpt	Status	Date
Question	—	Permanent river of lava Rivers of lava are a staple of fantasy. But in the real world, lava flows are usually very short-lived phenomenons caused by volcanic eruptions. Is there some plausible way on an otherwise earth-like world to have a naturally occuring river of lava which is several meters wide, several kilometers lo... (more)	—	almost 5 years ago
Question	—	What would be a plausible speed for a 22nd century military ship? No, I am not talking about space ships, I am talking about water-based ships sailing the oceans on planet Earth. What would be a plausible cruise speed and maximum speed for what would be the equivalent of a modern destroyer after about 100 more years of technological progress? Please assume that th... (more)	—	about 6 years ago
Question	—	Why would anyone build robots when they have human rights? I have read (and answered) the question: "If true artificially intelligent robots could be built, would they be allowed human rights?". But let's explore the topic from the other direction. Let's assume that society came to the consensus that artificially intelligent robots do have human rights. Ro... (more)	—	over 6 years ago
Question	—	Could Jupiter moon Europa become habitable when the sun enters its red giant stage? It is estimated that in about five billion years, our sun will enter its red giant stage. During that phase it will expand and completely engulf Mercury, Venus and possible Earth. Earth will either be destroyed or become uninhabitable. Will there be a phase during this development where the sun's en... (more)	—	over 8 years ago
Question	—	What properties would make a plant ideal for use on a space ship? What properties of a species of plant would make it the ideal choice for taking it on a year-long trip through space as both an oxygen source and food source? We should assume that the amount of pressurized volume and payload mass is limited on the spaceship and that we only have technology which i... (more)	—	over 9 years ago
Question	—	How would the appearance of Earth from orbit change when it would be rendered uninhabitable? Through extreme pollution and large-scale warfare with atomic, biological and chemical weapons Earth has become completely unable to sustain life. The atmosphere is toxic, the water undrinkable and all higher plant- and animal life has died. How would this affect the way it looks from orbit? More spe... (more)	—	almost 10 years ago
Question	—	How many people can you feed per square-kilometer of farmland? Questions about how to feed a large population keep popping up on this website quite frequently. One obvious option is farming. But how many people can you feed per square-kilometer of farmland? Interesting would be a comparison depending on the farming method used: prehistoric methods medieval me... (more)	—	almost 10 years ago
Answer	—	A: What could cause Earth to drift out of orbit over a period of months to years? When you want the orbit of earth around the sun to get higher, earth isn't falling out of orbit, it is raising out of orbit. To get an object in orbit to a higher orbit, you need to add rotation energy to it. That energy needs to come from somewhere. A massive object passing through the solar system... (more)	—	almost 10 years ago
Question	—	Where to place industry in a megastructure? I am currently designing a megastructure which is supposed to provide living- and workplaces for about 100.000 people. It is supposed to be designed in a way that it provides everything the inhabitants need for everyday life so they rarely if ever need to leave it. While it is not completely self-con... (more)	—	about 10 years ago