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1 vote
1 answer
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Can a habitable S-type planet and three habitable P-type planets exist in one binary star system?

JBH
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3 votes
2 answers
272 views

What is an explosion could explode the whole Earth?

Charlie Hershberger
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10 votes
17 answers
2k views

How might derelict space ships/stations be only partially salvageable?

Zak A. Klajda
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13 votes
6 answers
5k views

Could there be a planet bigger than Earth, but with less gravity?

FuriousNukefrostArcturus
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3 votes
2 answers
255 views

If the current population of humanity along with necessities could fit on a spaceship, how large would that ship need to be?

raevynn
  • 177
20 votes
6 answers
7k views

Cold-blooded intelligent race: Is it possible?

Aaron Abel
  • 21
19 votes
5 answers
3k views

Are hydrocarbons viable foods for larger organisms?

L.Dutch♦
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13 votes
8 answers
2k views

How could I justify that ancient humans ruins have not been discovered?

CommunityBot
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19 votes
14 answers
5k views

Would science emerge in a world with magic?

CommunityBot
  • 1
4 votes
7 answers
2k views

How can a species be fine with digesting poisons and toxins?

CitizenRon
  • 103
-1 votes
6 answers
238 views

Is it always possible to for a warrior to kill themself and die?

Charlie Hershberger
  • 7,596
1 vote
1 answer
103 views

could an equator-round elevator be possible for passing through rings of a planet to reach the moons?

raevynn
  • 177
4 votes
6 answers
1k views

Countering Free-Electron Lidar?

Sanfera
  • 66
3 votes
0 answers
90 views

What If the Gibraltar Strait was shallow enough to close regularly, in every Ice Age

JBH
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