Activity for BuildingBetterWorlds‭

Type	On...	Excerpt	Status	Date
Question	—	How much antimatter would we need in order to wipe out all humans, eradicate all animals and blow up the Earth? Supposing we had many thousands of antimatter bombs (they can be detonated in many different locations), how much total antimatter would we need in order to wipe out all humans on Earth? Supposing we had one antimatter bomb (it has to be detonated in one particular location, but it can be as big as ... (more)	—	over 9 years ago
Question	—	By how much exactly would the time flow be slown down inside a gravity room? A super alien warrior goes training inside a gravity room. It's a room with a flat floor, but the surface gravity of the room can be modified at the push of a button. But under general relativity a higher gravity leads to a slower time flow. So my question is: what is the expression of $\dfrac{t{in... (more)	—	over 9 years ago
Question	—	Would a blind astronaut be able to sense the gravity of an object? Would an astronaut lost inside the Sun be able to sense which way is the core? Would a blind astronaut be able to sense the gravity of a nearby star/planet/moon? Would an astronaut lost somewhere inside the Sun be able to sense which way is the core and which way is the surface? Notes: For question 1, the astronaut is in the vacuum of space, the pressure outside of his spac... (more)	—	over 9 years ago
Question	—	If we put humans on planets with atmospheres different from Earth's atmosphere, but still containing oxygen, would humans be able to breathe? From Wikipedia: By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. For example, would humans be able to survive in these atmospheres? : 100% oxygen, nothing else 10% oxygen, 90% nitrogen 10% oxygen, 90% argon 10% o... (more)	—	over 9 years ago
Question	—	What would be the short-term and long-term effects of an increase in the strength of gravity on humans? I heard that some scientists placed chickens under 2.5g for 6 months, and they survived. A normal human would black out at 5g. A trained astronaut could take up to 8g before blacking out. 20g would kill anyone in a few seconds. I also heard that an increase in the strength of gravity can result in... (more)	—	about 10 years ago