37 Can Cloud Nine be built? 2016-02-23T20:26:50.700

28 Hiding a subterranean alien megastructure 2017-10-24T01:40:24.557

26 Can I just stack the Earth? 2016-02-05T09:52:31.843

25 Can you protect a Space Elevator from Space Junk? 2017-12-13T06:33:05.573

24 Are there any benefits to a large body of water in a space habitat? 2018-02-09T07:17:01.530

23 What to do with all the heat in a Dyson Sphere? 2017-02-10T15:11:55.283

22 What does a solid, 1 mile diameter subterranean glass sphere look like? 2018-08-13T20:03:58.320

20 Where to Anchor My Space Elevator 2015-01-17T04:15:34.203

20 Are planetary orbits absolutely necessary? 2016-08-14T16:51:36.400

16 How long would it take a civilization to see and understand a Dyson ring? 2018-01-17T19:04:39.050

15 Where to place industry in a megastructure? 2014-11-14T13:02:18.503

13 Artificial star? 2015-04-24T13:25:26.500

13 Prevailing winds on a rotating space habitat 2018-07-31T22:04:09.033

12 How much mass does a human need to live a satisfying life? 2017-05-31T07:18:24.963

11 Stable ringworld interactivity with other solar system objects 2017-05-01T18:08:46.330

11 Life on the Broken Ring - an issue of size 2019-06-26T18:56:25.547

11 How large would a space station have to be to hold one million people indefinitely? 2019-08-30T20:50:10.907

10 Uproot, Lift Up and Replant a City 2015-03-18T16:26:43.627

10 The Rollercoasters of Ancient Egypt 2015-07-20T23:10:01.997

10 Extremely huge dirigible/airplane hybrid feasibility 2017-08-23T14:59:42.967

10 O'Neill/McKendree Looping River 2017-09-28T16:20:51.930

10 In extreme cases, can skyhooks or space elevators be used to funnel extreme planetary heating 2018-12-31T14:48:31.757

10 Hurricane-force winds or gentle breezes in an O'Neill Cylinder? 2019-10-24T17:10:24.677

10 How to mine a star? 2019-11-02T12:16:36.973

9 Designing cities inside a hollowed-out asteroids 2015-04-11T00:53:48.633

9 Can we build a space elevator on the Moon with present technology? 2015-09-29T12:46:50.673

9 Mass transit across the solar system 2016-08-25T15:58:54.113

9 With minimal terraforming, what features/structures would need to be built to protect a 25mi radius city from wind? 2017-06-02T18:10:46.230

9 Stellar Compression in Dyson Sphere 2017-07-06T01:41:06.973

9 Floating island made of concrete, part 1: can it be made of roman concrete? 2017-10-17T15:54:48.813

9 How, and for how long, could a permanent storm be maintained on Earth by a stationary mega-structure? 2018-09-25T21:11:18.927

8 How might a capital ship keep its hangar secure without doors or force field 2016-08-28T01:54:15.090

8 Building a Dyson Shell around a black hole? 2016-10-07T02:43:15.477

8 Preferred method of mass transit inside an arcology? 2017-11-18T17:55:09.610

8 I want to build a flat Earth, for real 2019-03-22T13:26:42.247

7 Hot rods into space! 2015-07-29T02:21:34.573

7 How would a six kilometre long space station appear when viewed from the ground? 2016-06-07T16:49:29.757

7 A self-eclipsing orbital ring 2018-08-17T02:00:46.990

7 How could a skyhook stay in orbit with no human involvement for thousands of years 2019-12-10T21:59:39.467

6 Environmental/meteorological effects of a superstructure 2018-03-26T20:09:52.427

6 Viability of options for super tall tower 2018-04-13T14:20:22.023

6 Would there be gravity on the plates of a Dyson swarm? 2018-04-21T21:03:46.797

5 How long to freeze a planet? 2015-01-11T18:24:43.287

5 Could an Alderson Disk be habitable? 2015-05-26T18:16:12.647

5 What would be the population size of a fully urbanized Earth? 2016-02-05T16:27:03.207

5 How long does a component of a Dyson swarm spend in shadow? 2016-11-30T21:08:23.977

5 How can you set up a mine for the lower layers of the gas giants? 2017-02-17T04:46:08.277

5 How much ice do I need at 0.79c to protect my megastructure 2018-01-27T13:38:11.907

5 What would the climate of a planetwide city be like? 2019-04-02T19:10:59.010

5 What would a cyberpunk apartment building be built out of? 2019-08-19T16:00:18.530

5 Is it possible to have multiple different climates within one O'Neill cylinder? 2019-09-27T12:11:43.643

5 Maximum Size Limit for a Wooden-and-Bamboo Neo-Ziggurat 2020-01-10T15:24:28.457

5 How to allow a cylindrical habitat (O'Neill or McKendree) to radiate heat to space? 2020-02-06T21:09:59.997

4 Dyson Laser feasibility 2015-01-11T05:38:12.890

4 Mountain-sized Machines - How do they Move? 2016-02-03T18:53:08.030

4 Airborne Hotels - Stabilizing and steering a Cloud Nine tensegrity sphere 2016-05-30T07:04:20.820

4 Using Europa's geysers as a source of geothermal power? 2016-11-23T00:20:42.183

4 How long would it take to be able to make artificial moons? 2016-11-23T03:33:03.093

4 Ringworlds and habitability on other planets 2017-05-01T18:27:23.110

4 Creating a viable/stable Alderson disk 2017-06-19T07:48:56.227

4 Would a planet-sized computer like a Jupiter Brain or a Matrioksha brain be more expensive to build than the Death Star? 2017-09-12T20:17:13.330

4 How do 21st century C.E. submersibles enter an underwater dome swiftly and safely? 2017-10-03T07:55:12.590

4 Artificial water planet and shell world combo 2018-03-27T23:31:13.547

4 How would gravity affect a structure that completely encircled the earth 2018-06-24T08:46:20.547

4 Creating a Matryoshka Shell world: temperature regulation 2018-11-08T18:30:06.553

4 How long would it take for all evidence of humanity to be erased from Earth? 2019-08-22T22:07:15.923

4 How much industry is required to keep maintain in a western living-style for 10000 people? 2019-09-26T15:50:50.160

3 Lighter-Than-Air-Bridge II: Tethered Gondolas 2015-03-31T22:46:31.000

3 Neutron star mining? 2017-09-09T19:52:05.010

3 White Dwarf mining? 2017-09-10T02:40:54.177

3 Reasons for every floor of an office building needing a unique code to access that floor via the lift 2017-12-10T21:57:25.913

3 Reality check: multi-shell worlds and rotation 2018-11-13T16:33:19.493

2 Building and stabilizing a SupraWorld. 2016-05-23T12:01:15.173

2 Supervolcano Defense - 2100 2016-09-20T07:05:24.610

2 Would this megastructure work? 2016-10-01T04:17:52.817

2 Stopping Glaciers and Colonizing a Super Antarctica 2016-10-03T02:37:06.297

2 How to crash the earth into the sun? 2017-05-01T10:22:19.147

2 Reasons someone might build a giant ring around a planet? 2017-09-13T02:10:08.660

2 How to accelerate the rotation of an Earth-sized planet? 2018-04-19T08:00:46.723

2 Has realistic climate modelling been done for inverted Dyson spheres or similar? 2018-05-26T20:14:19.143

2 Life evolving on a artificial Floating Island on a ocean world 2019-03-09T21:20:08.147

2 Could an enormous structure be used to attract rain by acting as an artificial mountain? 2020-01-10T05:41:35.233

1 Could you build a non-spherical structure that's >1000km long? 2016-09-15T03:22:09.650

1 Energy transfer to a planet far from its star 2018-01-31T00:58:35.140

1 Building a planet with a primordial black hole core 2018-08-04T11:54:15.737

1 Creating a Matryoshka Shell World: Sectioning 2018-11-15T20:36:39.830

1 Building a Dyson Array as an energy source 2018-12-10T11:50:21.180

1 How big does a LEO object need to be to be clearly visible from the ground? 2018-12-18T05:01:05.660

1 How massive can a structure get on the inside of a Mckendree cylinder? 2020-01-18T13:04:04.483

0 Reasonable Legislative Restrictions on a Super Weapon 2018-03-09T14:34:59.563

0 How long would it take to move the population of the earth into a single city? 2019-06-27T12:29:13.920

0 Are Orbital Rings feasible to construct in another star system? 2020-02-29T02:45:25.937

-1 With modern science and engineering, what is the tallest and thickest structurally sound wall we can make 2017-04-22T12:47:31.543

-1 How can a medium-sized island be moved covertly? 2018-09-22T22:36:25.797

-1 The Underdown, part 1: Size issues 2018-10-08T18:55:53.323

-2 How Many People Per Dam Arcology? 2017-06-08T01:01:25.790

-2 How to blow up an alien skyscraper? 2017-07-01T12:29:01.700

-3 What would the surface of a Jupiter brain look like? 2016-09-26T23:28:46.770