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For questions that ask if a given concept is consistent, or being used consistently, in the context of the referenced world rules. Answers should say yes or no, with supporting info. This tag should not be used with the science-based, hard-science, or science-fiction tags. Comparisons to the real world should use the science-based tag. This tag may not be used alone. This tag may not be used with the science-fiction, science-based, or hard-science tags.

8 votes

What if we lived near a boundary of the universe?

I don't think any sort of "hard" wall would make sense without violating conservation of mass/energy/momentum but perhaps you could imagine the edge of the universe as a broad singularity, kind of lik …
spraff's user avatar
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10 votes
10 answers
2k views

Can a mountain range form with a very loose surface?

In my story there is a mountain range which is almost impossible to climb because it is very steep, and it has a very, very loose surface. Wherever you put your foot, the ground is liable to slip away …
spraff's user avatar
  • 2,269
2 votes

Are jumping ships feasible? (Not jump drives, but ships that jump)

If you have very long legs, yes. Spreading out the force over a long distance means you need less power (and will incur less $v^3$ air resistance. If you wanted short legs they'd have to be telescopic …
spraff's user avatar
  • 2,269