Tag: planet

47 How many planets are there in this solar system? 2013-10-08T23:43:31.327

46 Why hasn't the "9th Planet" been detected already? 2016-01-23T01:36:35.630

35 9th planet location? 2016-01-20T19:54:14.817

33 Considering our methods of exploration, how likely is it that there are unfound planets (not dwarf planets) in our solar system? 2018-10-31T03:02:17.583

31 Did I see another planet? 2016-03-27T13:27:32.133

29 Can small gas planets exist? 2013-09-29T00:51:20.507

26 Why do (most of) the planets rotate counterclockwise, i.e. the same way the Sun does? 2014-08-21T17:46:55.930

22 Is it odd that our Sun has so many planets? 2016-01-21T19:26:28.250

21 Is there a upper limit to the number of planets orbiting a star? 2013-11-05T18:30:49.010

20 Why do the planets orbit in the same direction? 2016-06-26T15:19:37.860

19 What physical features determine if a planet is a major, minor or dwarf planet? 2013-09-26T07:33:33.467

19 How bright would the sun appear from the hypothetical Planet Nine proposed by Caltech? 2016-01-21T06:01:25.047

18 Why does a planet rotate and revolve? 2013-09-29T10:35:02.707

18 How do/did we figure out that planets move in orbits? 2013-10-10T22:37:07.967

18 Doesn't gravity attract objects in space until they collide? 2013-11-21T04:48:01.427

18 Hypothetical trans-Neptunian planets orbiting the Sun 2013-12-16T04:21:08.577

18 How did Mars come to have a 24 hour 39 minute day? 2015-10-25T21:07:54.400

17 Does a planet's mass or gravity affect the height of it's mountains? 2013-11-13T06:44:01.813

16 Moon orbits crossing each other 2013-10-03T22:43:55.840

16 How long should it take for us to observationally determine if Caltech's Planet Nine is really there? 2016-01-20T18:42:58.860

16 Could the 9th planet be virtual? 2016-05-30T10:04:10.740

15 What reason is there to doubt the existence of the hypothesised planet Tyche in the far distant solar system? 2013-10-18T06:54:33.457

15 Why are orbits elliptical instead of circular? 2013-12-23T15:10:05.213

15 How did scientists determine an estimate of the number of planets greater than Sedna's size to exist in the Inner Oort Cloud? 2014-09-24T04:05:32.370

14 Planets and Pluto? Neptune? 2014-10-15T18:06:59.810

14 What wavelength to best detect the "9th planet"? 2016-01-22T11:43:40.690

14 How can clouds form in Jupiter's atmosphere of Hydrogen and Helium? 2016-11-28T18:06:07.763

13 Do the orbits of planets change sometimes? 2013-09-24T23:50:13.957

13 What is the current theory for the formation of the Earth's Moon? 2013-09-27T02:07:51.733

13 Were effects of a planetary magnetic field reversal observed on other planets than Earth? 2013-10-09T02:33:07.800

13 How do we detect if a planet has a liquid core? 2013-10-15T18:47:32.730

13 How would I measure that I'm at a pole? 2013-11-20T14:13:38.147

13 Does the gravity of the planets affect the orbit of other planets in our solar system? 2014-01-29T01:26:46.003

13 Any possibility for life on moons of planets in our Solar System 2014-02-03T11:23:18.097

13 Is it Possible for Planetary Bodies To Exist In Close Proximity Without Adverse Effects? 2014-07-09T13:30:48.523

13 Is Pluto still a dwarf planet? 2014-10-05T14:59:26.310

13 Open problems in astronomy that an amateur (with a PhD in some other field) would have a chance of solving? 2015-04-05T12:20:26.120

13 Where might a semi proficient amateur analyst participate in meaningful astronomical efforts 2015-05-17T14:11:30.250

13 How would parallax affect an object at 200-1000 AU (for example, the 9th planet)? 2016-01-21T00:50:52.610

12 Changes to Earth's orbit 2013-11-01T00:12:56.400

12 Do planetary rings have geometric bounds? 2013-11-01T16:00:22.640

12 Is it possible for a moon to orbit a planet floating free in the galaxy rather than orbiting a star 2013-12-23T17:38:13.063

12 Why are planets spherical? 2014-01-09T17:16:17.643

12 When will all eight planets in our solar system align? 2014-05-13T21:57:15.107

12 Can there be an object with planetary discriminant between Ceres and Neptune? 2015-05-29T19:35:53.177

12 Subterranean Oceans On Other Planets/Planetoids: How Do Astronomers Deduce This 2015-10-23T04:50:19.093

12 Is there a ninth planet? 2015-11-02T06:44:24.420

12 Can dark matter be found in the shape of planets, galaxies etc.? 2016-04-05T19:30:41.543

12 Orbital velocity of a planet - why is my calculation off by about 10%? 2016-10-16T15:29:36.340

11 What is the relevance of the Tropics and the Polar Circles? Do they Exist on other planets? 2013-09-26T09:01:50.140

11 Present distances between planet. How can I find them? 2014-04-01T12:05:35.947

10 What effects do other planets have on the solar system? 2013-10-24T08:50:42.803

10 What might cause a planet to have a significant tilt in their orbit? 2013-10-24T21:25:03.080

10 Is there anything special about our position in the galaxy thats necessary for life? 2014-02-01T13:17:45.387

10 Are there large underground caverns on Mars? 2014-06-29T14:41:45.330

10 Why does the Solar System have no (natural) satellites of satellites? 2015-05-02T06:07:23.403

10 Pluto- Current theories regarding its geological nature? 2015-07-22T11:35:25.780

10 Why does the planet Saturn have numerous (62) moons compared to the rest of the planets in the Solar System? 2016-01-29T14:50:01.063

10 Why don't storms on gas giants move to the poles, like hurricanes on Earth do? 2016-02-01T02:30:06.043

10 Why are Saturn bands much fainter than Jupiter's? 2016-07-12T15:38:36.930

10 Do blue giants have a habitable zone? 2017-04-03T00:07:29.137

9 Find distance from star to star? 2013-12-04T07:46:33.977

9 Why don't planets and asteroids have (cometary) tails? 2014-04-10T15:53:24.373

9 Is it possible that only one hemisphere of a planet has an atmosphere? 2014-10-10T00:02:02.310

9 Years, months, days, and ... weeks? 2015-04-17T00:57:03.460

9 Are there equal number of planets, stars, galaxies etc in observable universe spinning in both directions? 2015-11-04T07:54:56.693

9 Period coincidence of Planet Nine with furthest Kuiper belt objects 2016-11-04T20:10:03.300

9 What could be the possible origin of boron found in the Martian soil if not from ancient groundwater? 2016-12-19T03:36:51.930

8 Did the Late Heavy Bombardment Period Happen Because of a Stellar System Collision? 2013-10-08T21:18:50.483

8 Why do the planets in the Solar system stay in the same orbital plane? 2013-12-08T10:42:52.113

8 What does the term alien planet actually refer to? 2013-12-28T00:13:28.147

8 How are rogue planets discovered? 2014-02-13T07:02:50.463

8 Galactic Habitable Zone 2014-03-14T15:57:23.503

8 How small can a planet be and still have Earth-like gravity? 2014-04-30T00:52:53.497

8 What is the process for vetting the 4,175 candidate planets Kepler has discovered? 2015-01-12T16:25:07.277

8 How much mass does an object in space need to keep a human on its surface? 2015-02-02T13:29:31.933

8 Is atmospheric turbulence irrelevant for ExoPlanetary transits and radial velocity measurments? 2016-01-13T17:38:55.410

8 How was the hypothetical ninth planet kicked so far out of the Solar System? 2016-01-22T01:37:51.897

8 Why do planets tend to rotate in the same direction although they have formed from tumbling asteroids? 2016-02-03T10:41:09.473

8 Is Pluto a "proto-planet"? 2016-11-15T17:43:23.747

8 How close can planets form to one another? 2017-02-22T20:57:24.117

7 Selecting a Telescope for Viewing Planets 2014-09-13T22:47:41.407

7 How to calculate the expected surface temperature of a planet 2015-03-13T17:42:59.357

7 Do all planets have a van Allen radiation belt? 2015-08-04T06:05:14.330

7 Are we sure there are no planets inside Mercury's orbit? 2015-11-30T03:20:45.387

7 Do asteroids have a gravitational field? 2015-12-16T23:26:09.507

7 Do all planets have a molten core? 2015-12-17T07:13:15.143

7 Who gets to name Planet Nine if it is confirmed? 2016-03-03T21:25:46.263

7 Are there any known planets whose axis is oriented such that one pole always faces its star? 2016-09-19T17:41:18.413

7 Why does each and every planet of our solar system have an unique axial tilt angle? 2018-06-08T18:33:27.553

7 Saturn's tropical year? 2018-06-11T02:12:56.233

7 Is Mars brightest from Earth at opposition, perihelion or somewhere in between? 2018-06-13T17:41:01.773

6 What method is used to calculate the 'quality' of a solar/planetary image? 2014-02-17T22:45:47.827

6 What is the orientation of planetary orbits? 2014-03-07T05:43:10.523

6 Weight of a celestial body 2014-08-13T04:16:52.760

6 How would we detect a planet behind the Sun? 2014-10-09T08:47:04.467

6 Can a gas giant have an other gas planet as satellite? 2014-11-02T14:52:56.413

6 Maximum and minimum gas giant & ice giant densities 2015-01-03T05:33:54.560

6 What astronomical observations would give conclusive proof of alien life? 2015-02-11T05:01:04.767