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user73829
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19 votes
9 answers
8k views

Could a jellyfish be bio-engineered to convert salt water into fresh water?

8 votes
10 answers
2k views

Are supersonic submarine trains necessary in a civilization that spans a galaxy

6 votes
1 answer
143 views

Can sonoluminescence be used to create exotic art in my future civilization?

5 votes
1 answer
310 views

Could pulsars really act as "lighthouses" to help in interstellar travel?

4 votes
5 answers
2k views

Would a planet-sized computer like a Jupiter Brain or a Matrioksha brain be more expensive to build than the Death Star?

4 votes
2 answers
1k views

Could a quantum computer be able to simulate a universe? [closed]

3 votes
2 answers
180 views

How could I make an ion engine work within an atmosphere?

2 votes
1 answer
155 views

What would be more realistic for a universe where FTL is possible?

2 votes
2 answers
278 views

What would discovery of a magnetic monopole do for a civilization? [closed]

2 votes
3 answers
302 views

Feasibility of a pill with the opposite effect of birth control?

2 votes
2 answers
139 views

What would be involved in generating an artificial magnetosphere for planet Mars? [duplicate]

2 votes
2 answers
330 views

How feasible is "invisible spray"?

1 vote
1 answer
86 views

What features would a future, advanced telescope have? [closed]

1 vote
1 answer
94 views

Would vertical forest cities be unnecessary in a Galaxy wide Civilization? [closed]

1 vote
1 answer
404 views

Would a magnetic monopole rocket engine produce more energy than an ion engine?

0 votes
1 answer
165 views

Is this phrase technobabble or can it be broken down to be understandable? [closed]

0 votes
2 answers
213 views

What's a cool function or ability that a new element on the periodic table could have? [closed]

0 votes
3 answers
264 views

Could it be possible to contain an artificial singularity? [closed]

0 votes
2 answers
474 views

What could be done to make a red dwarf become a blue dwarf, then a white dwarf and then finally a black dwarf in a short amount of time?

0 votes
5 answers
306 views

Would a tank with a cloaking device be pointless? [closed]

0 votes
2 answers
168 views

Could a machine be built that allows you to talk on different frequencies? [closed]

0 votes
1 answer
50 views

Is Friction charging or Tribostatic charging, futuristic?

0 votes
1 answer
122 views

Could this algorithm be inaccurate or cause ethical problems? [closed]

-1 votes
4 answers
223 views

What would a "molecular debonding spray" do? [closed]

-1 votes
1 answer
134 views

How would a shrink ray work without actually “shrinking” a living being? [closed]

-2 votes
1 answer
173 views

What's a good name for this technology? [closed]

-3 votes
1 answer
135 views

Are these technologies futuristic or are they already being used in real life? [closed]

-3 votes
1 answer
89 views

What is a nanocomputer processing node? [closed]

-3 votes
2 answers
115 views

How could I explain how a “three body or more system” orbit works? [closed]