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2 votes
3 answers
241 views

What would a planet where giant creatures live be like? (gravity, weather, etc.)

3 votes
6 answers
367 views

How to keep a city floating beneath the surface of an exoplanet's ocean in place?

2 votes
3 answers
636 views

Frozen Stars - Alternate sources of electricity

8 votes
3 answers
2k views

The Frozen Star - Can U-238 reactors be used as a energy source for 10,000 years?

18 votes
15 answers
5k views

How do I keep my futuristic racing hovercraft from becoming airplanes?

3 votes
1 answer
178 views

What would realistic racing hovercraft look like in terms of aerodynamics?

4 votes
3 answers
381 views

Could a planet much larger than earth have the same gravity if it were hollow?

11 votes
10 answers
3k views

Engines capable of surviving a highly destructive space battle

12 votes
3 answers
4k views

Could a planet orbiting a star have a habitable moon and this moon have its own moon orbiting it?

2 votes
5 answers
278 views

Why is my laser’s effectiveness dependent on the target material?

4 votes
3 answers
2k views

Birds flying or swimming in space

17 votes
5 answers
4k views

Is it possible to make a "safe" electromagnetic "jet engine" using extremely long wavelengths?

10 votes
15 answers
3k views

What makes my artificial intelligence indestructible, but containable?

2 votes
0 answers
226 views

What would the climate of a Pangaea-Ultima-inspired world be like?

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