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4 votes
6 answers
404 views

Small Arms Laser Alternatives

4 votes
3 answers
168 views

Disease that rapidly kills and replaces cells - severity of symptoms

3 votes
2 answers
190 views

What traits would a species have if it eats electricity to survive?

8 votes
8 answers
2k views

Idea for a more "efficient" brain?

3 votes
5 answers
322 views

War and Conflict within a O'Neil Cylinder

5 votes
4 answers
522 views

Colour of the sky on a moon with an thin artificial atmosphere

1 vote
1 answer
101 views

If the USA was hit by a bombardment of nuclear warheads, what would the landscape look like?

6 votes
15 answers
3k views

Is there any practical reason to keep a primitive civilization on an artificial habitat

17 votes
4 answers
5k views

Would the "Rods from God" satellite actually create an explosion?

28 votes
26 answers
6k views

Why are my combat spacecraft crewed?

1 vote
1 answer
66 views

Human precursors design powered armor for invertebratre Cephalopod slaves that have lungs too, up-right or octopus-form?

-1 votes
1 answer
136 views

Performance Comparison of Some Common Sci-Fi Propulsion Systems

10 votes
7 answers
2k views

What would an alien spaceship need to have to be undetectable to us with our current technology

2 votes
2 answers
110 views

Electric Arc Discharge Plasma and other forms of Plasma tech as a weapon

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