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Anixx
  • Member for 9 years, 7 months
  • Last seen more than a month ago
31 votes
5 answers
8k views

What is the maximum size of a planet that a chemical rocket can leave it?

30 votes
4 answers
5k views

A planet illuminated by a black hole?

23 votes
4 answers
2k views

How would solar activity change if the Sun was impacted by a planet?

18 votes
9 answers
6k views

Would near-lightspeed spaceships have an aerodynamic shape?

17 votes
19 answers
4k views

How can I make so that not much useful scientific knowledge or artifacts remain of an ancient, advanced civilization?

15 votes
6 answers
5k views

Can birds evolve without trees?

15 votes
3 answers
468 views

Planet illuminated by blue-shifted relic radiation

12 votes
8 answers
4k views

Can a galaxy be destroyed by a single but well-accelerated particle?

12 votes
3 answers
959 views

Can a planet be on a stable orbit at a Lagrangian point of a binary star system?

12 votes
6 answers
6k views

How long will global internet connectivity remain if all people are incapacitated?

11 votes
5 answers
971 views

Permanent settlements on the surface of ice

10 votes
7 answers
3k views

What metals will a culture most likely use if use of iron is prohibited?

8 votes
8 answers
329 views

What conditions may lead to an intelligent civilization employing only bio-machines?

7 votes
2 answers
202 views

Other universes in a broad sense [closed]

7 votes
3 answers
360 views

Iron-free metallurgy

6 votes
7 answers
2k views

Can non-intelligent life naturally evolve the ability to space travel and to live in interplanetary space?

6 votes
1 answer
1k views

In world with three opposing factions, what ideological, military, economic, and legal issues would arise?

6 votes
6 answers
794 views

How realistic are ice plants?

6 votes
2 answers
210 views

Is 50% CO2, 50% H2O ocean possible? If not possible, what other proportions are OK?

5 votes
4 answers
433 views

Magnetic thread storage?

5 votes
1 answer
115 views

How close to a star can be a tidally locked planet so to have moderate temperature on its dark side? [closed]

4 votes
5 answers
392 views

Most of Solar System is colonized but Earth dies with most of knowledge and technology. What the colonists may do to rebuild the civilization?

4 votes
6 answers
2k views

How would warfare be different in a world made up of two infinitely large empires? [closed]

3 votes
0 answers
294 views

Living in a world with no mechanical friction [closed]

3 votes
3 answers
615 views

Biology-centric civilization vs AI-based civilization

3 votes
7 answers
473 views

What will happen if very dangerous technology becomes cheaply available?

3 votes
4 answers
656 views

Life on a moon of a moon [closed]

3 votes
4 answers
401 views

How would a government prevent astronauts from making political statements?

3 votes
1 answer
177 views

What would happen if all dark energy instantly converted to radiation due to vacuum metastability event?

3 votes
3 answers
166 views

Planet with two independent forms of life? [duplicate]