195 I'm stranded on an alien planet. How do I measure an earth year without a clock? 2015-09-21T20:01:14.570

118 Could a planet made completely of water exist? 2014-12-04T20:28:41.187

116 Which major solar system body could most realistically be artificial? 2017-03-18T14:41:10.760

106 How would having multiple moons affect tides? 2014-09-16T22:04:49.500

106 What would make scientists realize they were on a flat world? 2016-05-27T13:02:38.770

88 A mosque on Mars? 2018-06-13T18:59:29.313

71 Is it physically possible for a planet to have seasons of different lengths? 2014-09-17T14:58:11.893

71 How can I move a planet? 2016-06-20T19:15:43.183

68 Would earthlike planets in other solar systems have well-known Earth gemstones such as rubies, emeralds and sapphires? 2018-04-02T13:19:17.293

66 Are geographically typed planets realistic? 2014-09-16T19:39:14.647

66 The opposite to Worldbuilding: World Destruction 2014-11-27T10:03:26.680

58 Would the human body support living on planets with a greater gravity than Earth? 2014-09-17T11:45:05.767

58 What would it feel like on the surface of a planet while it collides with another planet? 2016-04-18T14:28:23.447

57 What impact would a dragon the size of Asia have on the environment? 2019-07-14T15:15:28.293

53 Planetary Scale Artworks 2014-12-16T12:56:39.440

52 If we put humans on planets with atmospheres different from Earth's atmosphere, but still containing oxygen, would humans be able to breathe? 2015-02-17T18:24:44.640

51 What kind of recurring phenomena could cast darkness on a planet for days/weeks at a time? 2017-03-03T04:14:11.617

51 If a large space ship crashes on a planet, what could kill passengers without obliterating the ship? 2018-07-26T16:35:40.887

50 What would a planet spinning fast enough to allow geostationary orbit near the surface look like? 2014-09-20T06:02:14.997

50 Could two planets be tidally locked to each other so close they share their atmosphere? 2014-11-23T18:33:07.017

49 How would they learn astronomy, those who don't see the stars? 2016-10-12T13:23:18.053

48 How would a Martian colony be able to celebrate Christmas? 2014-12-04T15:01:54.587

48 How large would a world have to be for a sailing ship to never make it past the horizon? 2016-03-10T13:53:05.623

47 What would the sky look like from the surface of a planet with rings? 2014-10-15T03:45:36.470

47 What would be best way to re-melt Mars' mantle and core to revive its magnetosphere 2015-01-16T17:43:16.570

46 Can a planet be tidally unlocked? 2019-02-19T15:01:51.873

45 Can there be a planet with no dust? 2017-01-24T00:16:24.170

45 Can two adjacent, life-sustaining planets orbit a star such that they are rarely near each other? 2017-12-12T17:54:18.357

44 Could two planets follow the same orbit and never "see" each other? 2018-01-19T19:46:20.080

44 What are the safety margins for destroying a planet from space? 2018-04-24T21:34:35.340

43 How would winds behave on a tidally locked planet? 2014-12-01T20:39:19.307

43 How do seasons work in a binary system (planet orbits one star, not both)? 2015-09-09T02:16:43.477

42 What's the largest body in the solar system that you could destroy without endangering humanity? 2017-05-29T02:50:02.060

41 So we glassed it, now what? 2017-10-08T11:25:10.067

40 How can you prevent a theocracy from being inevitable when religious leaders have power over nature? 2019-01-08T11:48:08.667

39 Resources to justify long-distance space mining missions 2015-04-28T19:11:57.823

39 Reasons why air travel isn't feasible, but ground travel is? 2017-09-21T18:39:54.447

39 Planet wide seasons: Possible? 2018-06-25T02:37:38.583

37 Stumped: How can I get a huge Earth-like planet? 2015-04-23T15:56:28.327

37 Can a planet survive a supernova? 2015-06-11T21:44:18.190

37 Can 3 planets rotate around each other like this? 2016-09-01T17:46:24.613

36 How extensive could a habitable twilight zone be on a tidally locked planet? 2014-09-21T07:28:13.563

36 Can a planet realistically have multiple suns? 2014-10-15T19:43:05.993

36 Habitable moon of a gas giant: working out the sizes and distances 2015-01-05T20:37:15.170

36 How can I destroy a gas giant planet? 2015-02-12T14:12:15.610

36 What conditions would prevent the possibility of human-made satellites orbiting a habitable planet? 2017-02-21T15:45:00.470

35 That's no Moon: Planet-sized Plants Possible? 2015-02-26T14:56:42.913

35 How large could a planetary diamond be? 2015-03-12T20:22:42.483

35 What's the smallest reasonable natural planet or moon with Earth-like surface gravity? 2017-04-03T08:52:19.840

35 How Would Civilisations on Different Planes of a Cube Planet Interact? 2019-10-23T12:09:16.627

34 Could you float a boat on a gas giant? 2018-01-11T19:48:55.840

33 Are "planet of hats" realistic? 2014-09-17T02:42:07.660

33 What environment would make leaves light blue? 2014-10-01T11:55:08.707

33 What would the problems with / consequences of a torus shaped planet be? 2014-12-13T18:43:27.673

33 What are the effects of a planet staying long-term inside of a nebula? 2015-04-16T16:37:05.843

33 A monochrome planet 2016-08-24T06:05:06.830

33 How could a planet have erratic days? 2019-03-21T11:36:30.057

32 What would skies look like on Worlds inside Nebulae? 2014-12-02T11:06:10.883

32 Gravity on a Minecraftian world? 2015-03-20T23:43:20.120

31 A planet rotating twice per second; what mass is needed to hold it together, and how oblate would it be? 2017-01-17T17:03:58.260

30 What happens when one planet "lands" on another? 2016-01-28T23:25:53.037

30 How can I have a habitable world on which life can not develop? 2017-03-08T02:00:29.013

30 In what era or tech level in earth's history did people have the ability to cross a super-earth's ocean 50,000 km wide? 2018-05-03T07:15:33.503

30 How can glass marbles naturally occur in a desert? 2019-08-07T16:22:04.420

30 Can there be plants on the dark side of a tidally locked world? 2019-09-02T15:15:47.727

30 What would influence an alien race to map their planet in a way other than the traditional map of the Earth 2019-09-21T18:56:36.423

29 Can a nonspherical planet exist and can it be habitable? 2015-01-15T21:02:54.933

29 Is there anything that would accelerate the death of the sun? 2015-05-18T17:40:33.163

29 Terrestrial Exoplanet Skies – I've Built a Visual Sky Chart. Is it Correct? 2017-12-18T04:53:27.030

29 5km artificial planet, with same gravity as on Earth 2018-07-04T17:31:04.250

29 A planet illuminated by a black hole? 2019-07-25T19:20:52.320

29 How could a planet have one hemisphere way warmer than the other without the planet being tidally locked? 2019-09-03T14:26:38.377

28 How critical is it for life that a planet remains within the habitable zone at all times? 2014-09-21T03:28:26.037

28 Can a planet have a figure-8 type of orbit around two separate stars? 2014-10-16T15:39:37.797

28 How would we build Earth Mark II? 2015-01-29T20:05:39.573

28 Nine Different Earths in One System--How to Make That Possible 2015-10-05T16:51:15.917

28 Why might a planetary recon craft need to be manned? 2016-07-12T02:18:21.390

28 Why didn't we detect that exoplanet before? 2017-12-04T11:48:43.073

28 An Eden-like moon orbits a barren terrestrial planet. Why is the planet barren while its moon is earthlike? 2018-08-29T21:43:11.867

28 How can I launch a projectile to hit something in orbit, using only geological structures and power sources? 2019-02-03T17:18:52.397

28 Best place on Earth to fake being on a distant planet? 2020-02-22T22:44:16.373

27 What is the smallest planet that a civilisation could develop on? 2014-09-16T19:51:17.330

27 What physical and social effects could two stars cause? 2014-09-17T05:43:58.427

27 A planet with changing gravity? 2015-06-09T16:11:52.310

27 In a world without obstacles, would life evolve wheels? 2015-09-01T11:19:53.423

27 How deep can the ocean plausibly be? 2015-11-26T12:48:09.477

27 Is it worth colonizing a planet that travels near the speed of light? 2016-06-21T21:11:27.533

27 Relative Super Powers 2018-06-27T16:06:06.607

27 Could you fall off a planet if it was being accelerated by engines? 2019-06-27T08:16:18.943

26 Can an atmosphere englobe a planetary ring? 2014-10-08T12:07:15.317

26 Is it possible to have a strip of cold climate in the middle of a planet? 2019-03-23T19:05:43.037

26 Keeping an "hot eyeball planet" wet 2019-07-25T03:29:15.143

25 Can planets die of old age 2015-01-15T15:32:19.123

25 Making a Planet Seem Uninhabitable 2016-12-07T16:33:25.333

25 What's the biggest reasonable natural planet or moon with Earth-like surface gravity? 2017-11-05T12:10:17.527

25 Need a specific event that wrecks the surface, allows the race to survive in bunkers, and affords an aftermath suitable for them to rebuild 2019-01-27T19:05:45.980

24 Equatorial icecaps and polar jungles a fantasy or reality? 2015-07-29T21:52:38.147

24 What is the feasibility of a floating city on Venus? 2016-12-08T14:47:06.690

24 What effect would liquid sulfur oceans, sulfur dioxide in the atmosphere have on visibility, sound propagation and other environmental information? 2017-02-06T09:24:30.110