Activity for Irigi
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Calories production in plants per year I am trying to estimate how much calories is available in form of plants to mammal herbivores per square meter per year in optimal conditions. By optimal conditions I mean that the climate is temperate, with enough water and sun for most of the year. By other words: how much food does the photosynth... (more) |
— | over 8 years ago |
| Question | — |
How deep can underground tunnels be within the scope of science? If the Earth's interior was not hot and liquid, how deep could we dig before the tunnels collapsed by the pressure or the air became too pressurized to be breathable? In other words: how deep can underground tunnels be and still be scientifically plausible? (more) |
— | about 9 years ago |
| Question | — |
Technology without heavier elements The theory of Late Heavy Bombardment says that approximately 4 billions of years ago, something disturbed the orbits of asteroids in the Kuiper belt, which caused extremely heavy bombardment of Earth by asteroids. This probably brought many heavy elements to Earth's surface. The heavy elements that w... (more) |
— | about 9 years ago |
| Question | — |
What could restrain post-singularity societies from spreading across the Galaxy? Imagine a world in which technology we would probably call "technological singularity" is possible and already happened on few places of the galaxy. By the singularity I do not mean that anything is possible, but rather that original biological species transform themselves into extremely highly intel... (more) |
— | over 9 years ago |
| Question | — |
Cost of colony on Mars/Moon per metric ton One possible approach how to estimate extend of space colonization is to define costs of it and then estimate the investments the governments and organizations would be willing to pay. In an excellent analysis of starship costs on the Rocketpunk Manifesto blog, the author shows that currently, the co... (more) |
— | over 9 years ago |
| Question | — |
Space station mass per person Imagine we build a space station much larger than the ISS with more or less today's technology. (For example in a scenario in which price of transport to orbit per kg is significantly reduced by technological progress.) The design of the station might look approximately like the Space Station V from ... (more) |
— | over 9 years ago |
| Question | — |
What is the minimum size of a self-sufficient industrial country? Imagine there is a country in which there are all important natural resources (oil, gas, metal ores, wood, etc.) in their natural form and which lies in a temperate climate region. There may be some portion of a sea. The country is completely isolated from the rest of the world - nothing (except for ... (more) |
— | over 9 years ago |