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HDE 226868's user avatar
HDE 226868's user avatar
HDE 226868's user avatar
HDE 226868
Moderator
  • Member for 9 years, 9 months
  • Last seen this week
  • A small planet somewhere in the vicinity of Betelgeuse
117 votes
Accepted

Is it worth sending a manned mission to a black hole?

109 votes
Accepted

What could make a star green?

99 votes
Accepted

Is using the Sun as a sort of 'garbage dump' safe?

91 votes
Accepted

Everyone believes everything Joe says. How can he get around it?

87 votes

How might modern humans leave a message for 50,000 years?

78 votes

Chlorine Trifluoride as a Space Weapon?

66 votes

Would planets be cubic in my "cuboverse"?

65 votes
Accepted

Plausible reason not to notice a planet

60 votes

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

59 votes
Accepted

Is my plasma cannon concept viable?

58 votes

How can I make manure without cows?

58 votes
Accepted

How could steampunk civilizations get lifting gas?

56 votes

What elements would be created in a star composed entirely of gold?

55 votes
Accepted

Santa is broke. How much does it cost for someone else to be Santa?

54 votes
Accepted

How early was the Earth liveable for today's humans?

53 votes

What is the best way to use my two portals?

53 votes
Accepted

Can a rational creature have a series of small brains instead of a large one?

53 votes

In a cemetery, what evidence could be found that humans were intelligent and had technology?

52 votes

Exactly how far apart are nearby stars from one another?

50 votes
Accepted

Is homicidal smiley gas possible?

50 votes

How would an aquatic race develop computers?

48 votes

What US states are most likely to rebel?

47 votes
Accepted

How many plants does it take to breathe?

46 votes
Accepted

How reflective is blood?

43 votes
Accepted

What happens when one planet "lands" on another?

42 votes
Accepted

Why would we use direct current instead of alternating current?

41 votes

Why would anyone build robots when they have human rights?

41 votes

Which major solar system body could most realistically be artificial?

41 votes
Accepted

How close to interstellar space travel could humans get in the near future?

39 votes
Accepted

Can you add a mini moon to Earth?

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