User John Dallman - Worldbuilding Stack Exchange

105 votes

Accepted

How to tell a clone apart?

answered Sep 22, 2016 at 7:21

82 votes

How can humans coexist with an intelligent carnivorous species?

answered Aug 13, 2016 at 20:38

70 votes

Could we reach the earth's core using today's nuclear arsenal?

answered Jul 4, 2016 at 16:38

60 votes

Accepted

How would someone hide an asteroid in the void of space so only they could find it?

answered Jun 23, 2016 at 16:22

59 votes

My star will explode as a supernova. What can I do in order to ensure that my planet survives that?

answered Jul 16, 2016 at 23:18

59 votes

Why would space traders pick up and offload their goods from an orbiting platform rather than direct to the planet?

answered Jul 31, 2022 at 10:29

48 votes

Accepted

Humanity after 100 million years?

answered Jul 25, 2016 at 22:47

45 votes

How to protect shops in the medieval era against thievery?

answered Sep 14, 2016 at 13:01

45 votes

How can the stars be wrong, so that an observer realises they're not in our world anymore?

answered Mar 24 at 23:05

41 votes

Accepted

Can a robotic army really defeat humanity?

answered Jul 17, 2016 at 23:18

41 votes

How would they learn astronomy, those who don't see the stars?

answered Oct 12, 2016 at 14:04

41 votes

Accepted

How might an astronomer discover they have been transported 50 years in the future?

answered Jul 14, 2020 at 23:16

35 votes

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Could we mine the Moon if we replaced the taken mass?

answered Sep 2, 2016 at 9:50

34 votes

Universal Phonetic Alphabet

answered Jul 13, 2022 at 21:22

34 votes

Accepted

What would cause horse-riding cavalry to return?

answered Mar 1, 2022 at 17:40

31 votes

The Earth is teleported into interstellar space for 5 minutes. What happens?

answered Jul 26, 2022 at 18:15

30 votes

Gravitational slingshots: could they be used to decelerate a spacecraft traveling at a small fraction of light speed?

answered Jul 20, 2016 at 21:05

29 votes

Is fire possible in this planet's atmosphere?

answered Dec 30, 2023 at 7:00

26 votes

Accepted

What would a planet with no moon look like?

answered Jul 6, 2016 at 22:40

24 votes

Accepted

Neural network used as "doping"

answered Aug 29, 2016 at 13:27

23 votes

Where should we store our brains?

answered Aug 20, 2016 at 6:12

22 votes

Hiding a Continent

answered Sep 24, 2022 at 22:31

21 votes

A person has composite memories from countless pasts - how would you detect this with modern medical equipment?

answered Jul 17, 2022 at 0:04

21 votes

Would life still be possible on Earth if its atmosphere suddenly became as dense as the Venusian?

answered Jul 4, 2016 at 22:33

20 votes

Accepted

How to set phaser to kill the mermaids?

answered Oct 30, 2016 at 10:21

19 votes

How fast is too fast for travel inside the solar system?

answered Jan 26 at 8:42

19 votes

How safe it would be to look at the other planet in double-planet system with naked eye?

answered Feb 25, 2023 at 17:23

18 votes

Are gunswords feasible?

answered Aug 29, 2016 at 20:43

18 votes

How to convey the scale of my humanoid without science or units?

answered Sep 13, 2016 at 10:47

17 votes

Can I send S.O.S in space with just a conventional cellphone?

answered Sep 22, 2016 at 7:29

Stack Exchange Network

334 Answers

How to tell a clone apart?

How can humans coexist with an intelligent carnivorous species?

Could we reach the earth's core using today's nuclear arsenal?

How would someone hide an asteroid in the void of space so only they could find it?

My star will explode as a supernova. What can I do in order to ensure that my planet survives that?

Why would space traders pick up and offload their goods from an orbiting platform rather than direct to the planet?

Humanity after 100 million years?

How to protect shops in the medieval era against thievery?

How can the stars be wrong, so that an observer realises they're not in our world anymore?

Can a robotic army really defeat humanity?

How would they learn astronomy, those who don't see the stars?

How might an astronomer discover they have been transported 50 years in the future?

Could we mine the Moon if we replaced the taken mass?

Universal Phonetic Alphabet

What would cause horse-riding cavalry to return?

The Earth is teleported into interstellar space for 5 minutes. What happens?

Gravitational slingshots: could they be used to decelerate a spacecraft traveling at a small fraction of light speed?

Is fire possible in this planet's atmosphere?

What would a planet with no moon look like?

Neural network used as "doping"

Where should we store our brains?

Hiding a Continent

A person has composite memories from countless pasts - how would you detect this with modern medical equipment?

Would life still be possible on Earth if its atmosphere suddenly became as dense as the Venusian?

How to set phaser to kill the mermaids?

How fast is too fast for travel inside the solar system?

How safe it would be to look at the other planet in double-planet system with naked eye?

Are gunswords feasible?

How to convey the scale of my humanoid without science or units?

Can I send S.O.S in space with just a conventional cellphone?