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celtschk
  • Member for 9 years, 9 months
  • Last seen more than 1 year ago
130 votes
20 answers
43k views

Could a planet made completely of water exist?

155 votes
34 answers
20k views

The AI that fails to be evil

19 votes
7 answers
19k views

What would an ammonia-based world look like?

131 votes
21 answers
17k views

How does Santa protect himself from IP lawsuits?

43 votes
12 answers
16k views

A person from medieval times comes into our time. What would he notice first?

45 votes
16 answers
11k views

A pill to make you think faster: Side effects?

88 votes
29 answers
11k views

Encrypting maps

21 votes
12 answers
9k views

If a space ship crashes on a planet, is it realistic that things from that space ship could be rescued afterwards?

57 votes
12 answers
9k views

Hacking the universe

52 votes
16 answers
8k views

On a generation ship, how to handle the dead?

28 votes
9 answers
8k views

Why would alien vehicles be tripods?

4 votes
8 answers
7k views

What would a relativistic kill vehicle hitting the moon look like from earth?

26 votes
4 answers
7k views

What minimal radius is needed for rotation to simulate gravitation without adverse effects on humans?

25 votes
1 answer
5k views

How to make a flying human

14 votes
6 answers
5k views

Realistic spaceships: How to design a transport spaceship?

13 votes
6 answers
5k views

Humans as pollinators

9 votes
9 answers
4k views

How would a disabled person earn their living in a medieval-type town?

35 votes
4 answers
3k views

How large could a planetary diamond be?

14 votes
4 answers
3k views

Bringing potatoes to the middle ages

16 votes
6 answers
3k views

Energy source for a generation ship

16 votes
3 answers
3k views

How long until a small black hole makes the sun fail?

23 votes
3 answers
2k views

What would ammonia snowflakes look like?

19 votes
4 answers
2k views

How far would I have to be from a nuclear detonation in space in order to survive it?

16 votes
6 answers
2k views

Space, the final frontier … to defend

15 votes
1 answer
2k views

Radiation shielding for a space ship

12 votes
7 answers
2k views

Expanding your empire's space from the inside — can it be useful?

21 votes
6 answers
2k views

How to safely wish?

16 votes
6 answers
2k views

Medieval low-energy houses

12 votes
5 answers
2k views

Could higher land-based life exist on a planet with a pressure of about 1 MPa?

25 votes
7 answers
1k views

Power plants — literally