John Dallman's user avatar
John Dallman's user avatar
John Dallman's user avatar
John Dallman
  • Member for 7 years, 10 months
  • Last seen this week
  • United Kingdom
0 votes

Can a 15km, rapidly-spining asteroid go undiscovered until the asteroid belt is being actively explored?

3 votes

What's a semi-plausible 24 hour planetary sterilization look like?

4 votes

Effects of a hypothetical "proton-decay" bomb for a fictional story

5 votes

What kind of alien technology would make space colonization viable?

45 votes

How can the stars be wrong, so that an observer realises they're not in our world anymore?

0 votes

Help conceive of some possible disasters that threaten the solar system and countermeasures

1 vote

Is it possible for a super Earth to have this specific atmospheric composition?

19 votes

How fast is too fast for travel inside the solar system?

4 votes

Crystals that change color continously

29 votes

Is fire possible in this planet's atmosphere?

1 vote

How likely is it for a father to succeed his late son on the throne, while this son also has a younger brother?

1 vote
Accepted

Solar Flare/CME Range Limits

0 votes

Topology of an exotic wormhole network?

0 votes

How small can an isolated society be at the technological level of the 18th century to also be self-sufficient?

1 vote

requirements for spatial manipulation

2 votes

Black Hole Containment

1 vote

How much would mtDNA testing help to track down matrilineal descendants of a 2000-year old immortal person?

2 votes

Is this sci-fi weapon realistic?

2 votes

Would a Gas Giant be a feasible option for in-atmosphere fighting?

2 votes

Feasibility of a convergent neural code across species?

3 votes

WW1 soldier in WW2 : how would he get caught?

0 votes

How would people protect themselves in a world where scientific laws may be modified almost omnipotently with specialized applied math?

4 votes

Unconventional ranged weapon for primitive sci-fantasy race?

4 votes

Elemental Foundry - Quasar powered post-ferrous material fabricator

4 votes

How can a plant have pure graphite cell walls instead of cellulose?

4 votes

How could a remote controlled bacterium work?

14 votes

Is it possible for rockets to exist in a world that is only in the early stages of developing jet aircraft?

14 votes

Super broad gauge railway vs double wide/multi track railway

3 votes

What are most hydrogen-dense materials that a pre-electric civilization could produce?

1 vote

If humans were killed out in the Great Oxidation Event, would they leave behind any evidence?

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