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

56 Is space piracy orbitally practical? 2016-11-30T18:44:53.720

52 Can you shoot someone with a bullet... from orbit? 2015-07-24T17:57:38.473

52 Is it possible to have a planetary system with planets having perfectly synchronized orbits? 2017-11-16T16:22:55.357

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

50 Can I produce a true 3D orbit? 2018-08-19T16:53:45.113

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

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

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

34 How to create an annual celestial event for a world 2018-02-21T16:43:14.163

33 Where is the best place to park your damaged spaceship, longterm? 2017-03-13T22:53:11.490

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

32 Is it possible to orbit inside a gas giant? 2016-06-14T20:05:01.760

29 Can two moons have intersecting orbits yet be guaranteed not to collide? 2019-12-04T18:28:30.207

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

25 How do you non-catastrophically reduce the mass of the Sun by half? 2018-09-26T15:43:22.720

24 What do Martians use for months and weeks? 2017-12-20T01:18:42.090

23 What are the possibilities of a dwarf planet orbiting opposite Earth's orbit? 2015-01-13T13:59:17.783

23 How big can a moon be where you can physically jump out of its orbit, to its planet? 2015-09-30T13:50:21.837

23 How can I prevent Kessler Syndrome among space stations? 2016-12-08T16:21:16.363

23 What major event could disrupt planet Earth's orbit around the Sun? 2016-12-29T16:23:14.663

23 Is it possible to have a sun with visible phases or cycles? 2017-05-11T18:24:39.913

23 Could Earth and the Moon be the same size? 2017-12-30T01:18:37.197

22 Realistic sky of an Earth-like moon orbiting a gas giant (length of day and size of celestial bodies) 2017-02-03T21:29:21.850

22 Severed Space Elevator 2017-02-14T16:06:04.500

22 Is it safe to orbit HDE 226868? 2017-02-22T14:52:08.260

21 Effects of a non-rotating Earth 2015-02-20T17:44:44.590

20 How long does terraforming take if you have to build the planet from asteroids? 2014-10-16T13:04:04.683

20 Could a planet's Karman line hypothetically occur under a liquid surface? 2018-09-11T19:22:03.503

19 Traffic in Space (a traffic controller for low earth orbit) 2014-12-14T08:43:42.097

19 Is it possible for a planet to have a liquid ring? 2017-09-19T19:26:02.753

18 What kind of event, if any, would knock the moon off its orbit, without destroying it? 2014-10-10T09:09:37.770

18 Could a theoretical cube shaped planet have a moon? 2014-12-13T20:39:01.523

18 How short can Milankovitch Cycles be on a world with a stable orbit? 2017-10-24T13:02:01.617

17 How would a torus world (donut shaped) have to rotate in order to have a stable day / night cycle in all of its regions? 2017-04-20T15:49:50.567

17 Why would it be unfortunate for a day length to vary in a planet; other than that Java API developers need to work a few hours more? 2018-11-29T04:20:33.830

17 How difficult would it be to turn the Asteroid Belt into a single body? What's the best method? 2019-01-24T19:05:47.450

16 Are there any software tools available to map the solar system hundreds of years from now? 2018-12-12T04:04:14.163

15 Habitable zone around a Class O hypergiant 2015-02-05T23:08:42.363

15 How would a moon in geostationary orbit appear to wax and wane? 2017-02-19T23:02:07.933

15 If a planet has 3 moons, is it possible to have triple Full/New Moons at once? 2019-04-26T08:01:05.037

15 Habitable Planet with Highly Eliptical Orbit 2020-01-05T04:17:41.950

14 What would be the effects of traveling faster than light on a worldship? 2014-10-09T08:00:09.367

14 Could it be possible for two planets to collide and not kill everything? 2016-01-29T01:13:45.763

14 Can a planet's axial tilt turn to always be facing its star? 2017-09-10T14:18:03.373

14 Junkyard planet trash distribution? 2018-03-07T19:41:04.130

14 Can a habitable moon rely on the magnetosphere of its parent planet for radiation protection? 2018-09-13T20:54:47.760

14 Would mining huge amounts of resources on the Moon change its orbit? 2019-03-18T08:18:34.163

13 Moon occasionally appears much larger in the sky 2016-02-15T18:00:17.057

13 Can two moons orbit each other while orbiting a much larger planet? 2017-07-18T20:06:05.090

13 Is my Solar System scientifcally possible? 2017-12-18T23:35:40.987

13 Is there a habitability zone between the primary and secondary stars of a binary star system? 2018-02-23T02:13:51.470

13 Can two stars orbit each other but each have their own planets in stable orbits? 2018-05-10T20:00:29.160

13 Early warning detection system for ground troops, against orbital strikes 2018-05-22T14:17:49.743

13 Could the moon crash into the earth if we colonised it and increased its mass? 2018-12-07T16:27:58.940

13 Gravity on an Orbital Ring 2019-09-10T23:27:12.600

12 Would co-orbital planets with very similar convergent evolutionary paths be possible? 2014-10-13T11:42:41.787

12 Could planets switch orbits like Janus? 2014-12-01T23:05:10.890

12 In a created planetary system, how many planets can fit in the goldilocks zone with stable orbits? 2014-12-06T00:05:59.023

12 What did the night sky look like 63 million years ago? 2015-04-09T05:43:18.997

12 Two planets in a stable horseshoe orbit? 2016-09-02T00:26:36.703

12 Is there actually a way to create total orbital denial? 2017-10-23T18:09:08.790

12 Horseshoe Orbits 2018-04-09T03:41:23.210

12 Can the Sun lose enough mass that Saturn's current velocity becomes escape velocity? 2018-09-25T15:31:08.333

12 Make solar eclipses exceedingly rare, but still have new moons 2019-03-29T17:16:34.587

12 In order to successfully have 3 orbital rings around a planet how do you have to orient them? 2019-07-03T21:16:10.817

12 Can planetary bodies have a second axis of rotation? 2019-09-17T22:58:00.147

12 Can a moon orbit a planet's southern pole? 2020-02-07T19:06:28.303

11 What are the parameters of a planet having multiple moons? 2015-12-06T01:46:23.797

11 Earth-like planet orbiting neutron star? 2016-02-01T19:54:15.617

11 Does an arbitrary constant burn path between two orbiting bodies exist? 2016-02-01T22:28:57.700

11 Is a moon made entirely of water possible? 2016-04-18T03:03:34.507

11 How would a planetary ring react to a magnetic field? 2017-02-13T04:48:28.343

11 Is it possible to have a planet that has seasons and is also cold at the equator and hot both poles? 2017-03-08T16:24:58.457

11 What would happen to a man-made orbital ring/belt, if a portion of it was destroyed? 2017-07-10T13:50:30.527

11 If you have multiple moons, do they behave in a standard way? 2017-09-26T13:33:43.180

11 Can one or multiple moon(s) pull the sea around my planet? 2017-10-27T10:52:51.383

11 A supermassive black hole is coming our way. When's the latest that we would notice? 2018-12-07T15:58:52.340

11 Where should a runway for a spaceplane be located? 2019-06-17T01:05:57.000

11 Could a planet have a naturally occuring moon at one of its Lagrange points? 2019-07-15T20:36:11.513

11 What are the odds that an alien spaceship entering a low Earth orbit would collide with an orbiting body? 2020-02-20T20:47:03.630

10 What size asteroid is needed to move the Sun? 2015-01-16T09:29:56.427

10 Creating realistic world - star cluster? 2016-10-03T10:26:15.600

10 Could a gas giant's moon have stable rings? 2017-10-27T13:03:21.727

10 The Nightfall / Kalgash System 2018-06-13T12:35:33.107

10 What sort of acceleration would I need for my space ship to reach Eris in 3 months 2018-12-20T17:07:30.210

10 Tides with 3 Largish Moons 2019-02-18T13:52:01.820

10 Can I render satellite deployment impossible, or at least impractical, by exploiting the Kessler syndrome? 2019-05-20T17:41:50.160

10 Moons in Binary Orbit 2019-06-05T18:42:29.693

9 Varying Gravity 2014-10-14T19:25:10.303

9 Can you catch a fish with a fishing rod... from orbit? 2015-07-25T22:14:19.577

9 How stable is the hexagonal rosette anyway? 2015-10-02T12:01:14.383

9 Twin tidally locked planets, non-rotating 2016-02-26T02:56:46.377

9 Can a situation exist where there is one pole that is hot and another cold on a planet? 2016-03-31T20:55:43.570

9 Would a destroyed orbital body's orbit decay? 2016-06-02T22:12:38.313

9 How would this tidally locked planet be affected by its moon and would the moon have a deaccelerated orbit? 2017-02-27T08:05:38.027

9 Safe communication from Earth surface to orbit and back 2017-03-14T11:01:05.697

9 Details needed for day cycle of lunar world orbiting a gas giant 2017-11-27T10:55:10.940