Tag: solar-system

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 Where does the Solar System end? 2014-10-04T15:32:43.693

33 Do all stars have an Oort cloud or is it a rare occurence? 2014-10-18T18:10:45.733

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 Can our Sun become a black hole 2015-01-05T09:04:41.973

30 Why is our solar system "tipped" about 63° with respect to the plane of our galaxy? 2013-10-09T01:12:39.320

30 Why is the Sun's density less than the inner planets? 2016-05-16T15:02:43.743

27 Pluto's orbit overlaps Neptune's, does this mean Pluto will hit Neptune sometime? 2014-01-24T06:54:44.470

26 Why do the planets in our solar system orbit in the same plane? 2013-09-25T14:48:33.620

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

22 Are we made of the stuff of one star or more stars? 2014-01-12T16:56:06.117

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

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

19 How often do comets survive passage by the Sun? 2013-10-01T13:20:01.323

19 How much magnification is needed to see planets of solar system? 2015-02-06T07:09:00.500

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

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

17 How many planetary systems exist in our galaxy? 2013-10-09T01:05:29.667

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 are the current observational constraints on the existence of Nemesis? 2013-10-01T00:06:31.483

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 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

15 Do we get any benefit from being in a galaxy? 2014-10-21T14:12:30.187

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

14 Have we ever observed a body, such as a large asteroid, "hitting" the Sun? 2016-01-07T02:51:54.960

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 Are any Pluto-sized objects remaining to be discovered in the Kuiper Belt? 2013-10-01T00:09:34.760

13 What Causes the Large Radiation Fields Around Jupiter? 2013-10-08T13:43:41.017

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 Why is the solar system often shown as a 2D plane? 2014-04-21T14:54:53.743

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

12 Do any known exoplanetary/solar bodies have "annular" eclipses similar to Earth's? 2013-09-26T14:53:45.853

12 What implications do younger Earth and Moon have on Late Heavy Bombardment genesis hypotheses? 2013-10-01T00:42:11.570

12 Is the Jupiter-Sun system considered a binary system of some type? 2013-12-11T16:16:54.367

12 What was the length of year 1 million years back? 2013-12-18T06:12:29.327

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

12 What is the name of our Solar System? 2015-06-22T13:06:54.533

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

12 Why do comets appear to have a continuous supply of dust? 2016-03-07T10:35:07.620

12 Is the Sun in our solar system moving or stationary? 2016-08-31T09:01:43.590

11 Does the Moon Have Enough Water for Robert Zubrin's Mars settlement Plan To Work? 2013-10-01T19:45:47.330

11 Finding the solar noon based on longitude and latitude? 2013-10-27T13:17:53.890

11 Using the Sun as a Gravitational Lens 2014-06-10T03:43:06.343

11 How did the Earth come to be in orbit around the sun? 2016-06-05T20:18:30.107

11 How did the lighter elements end up in the center of the solar system? Solar System Formation 2017-10-07T09:19:46.087

10 Which is the closest exoplanet to Earth? 2013-10-03T10:42:53.120

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

10 Is there a pattern between the mass of a body and the mass of orbiting objects around it? 2013-12-09T14:23:08.600

10 What's the likelihood of the existence of unknown elements in the Solar System? 2014-06-26T19:49:11.450

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

9 What does observational evidence say about the number of protoplanets believed to exist in the early solar system? 2013-10-26T10:14:36.990

9 Emulation of an Orrery 2014-01-10T10:46:04.420

9 How did our ancestors discover the Solar System? 2015-07-17T06:24:40.163

9 Could the trajectories of non-periodic comets be used to infer properties of the 'ninth planet'? 2016-01-21T08:28:50.997

8 Effect of Charon on Pluto 2013-09-30T19:21:27.070

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 Asteroids between Mars and Jupiter 2014-01-24T09:35:19.030

8 Why does the darkening of the Moon go from left-to-right during an eclipse? 2014-02-20T06:36:30.733

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

8 Is it possible to move a planet out of its orbit? At least a lighter planet? 2014-07-18T08:09:28.267

8 How unusual is the solar system? 2016-01-10T06:06:12.530

8 As viewed from Mars, what are Jupiter's and Saturn's maximum brightness in apparent magnitude? 2016-01-29T11:31:34.607

8 Lack of objects between heliopause and Oort cloud? 2016-02-02T04:33:17.560

8 How did they decide the length of one year even though it wasn't known that earth revolves around the sun? 2016-12-31T18:19:28.433

8 Which celestial object in the solar system has the fastest tangential velocity at its surface? 2016-12-31T19:55:15.117

8 How did we first determine the Earth's departure from sphericity? 2017-08-04T02:04:54.490

8 Why do stars twinkle but the Sun doesn't (I'm asking this because the Sun is also a star) 2018-02-06T05:56:03.627

7 Have Pluto or any of its moons been mapped? 2013-10-07T19:31:52.247

7 Standard practices and models for generating the ephemerides of the solar system 2014-11-13T19:23:06.520

7 Meteorites bring water 2015-01-11T13:19:04.807

7 Best approximation for Sun's trajectory around galactic center? 2015-10-28T19:39:09.033

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

7 What are the problems that need to be taken in consideration when trying to find planetary position by using jpl ephemerides? 2018-06-12T22:32:17.760

7 Are there any natural satellites in retrograde Sun orbit? 2018-07-10T11:31:27.337

6 Are Barlow lenses stackable for bright objects? 2013-10-17T22:23:16.317

6 Source of T Tauri wind? 2013-12-06T04:51:52.863

6 Can we calculate the average temperature of the heliosphere? 2014-01-23T09:04:10.547

6 Do solar systems have to evolve in a galaxy? 2014-02-11T17:16:54.663

6 What is the maximum number of planets in the habitable zone? 2014-02-23T22:26:32.543

6 Where can I find a set of data of the initial conditions of our solar system? 2014-05-13T00:18:49.360

6 Image sets for testing stacking algorithms? 2015-04-25T15:59:40.380

6 Official Definition of Satellite? 2015-07-14T02:47:25.453

6 Do most planetary systems have fewer planets than the solar system? 2015-08-28T02:25:19.997

6 What is the format of the data from the JPL's HORIZONS system? 2015-09-24T19:21:44.990

6 If a person were to die on the Moon or Mars, would the body decompose? 2015-10-08T04:05:57.603

6 Ninth planet - what else could it be? 2016-01-22T02:09:10.007

6 Do planets migrate suddenly or gradually? 2016-01-23T19:48:31.590

6 What good evidence exists for the 9th planet as spoken of by Caltech? 2016-01-25T17:34:09.223

6 Planetary reference systems and time 2016-01-25T18:11:02.340

6 Is Earth slowing down in order to stay on its orbital track? 2016-06-15T09:36:31.000

6 Do astronomers generally agree that the distinction between comets and astroids is not so clear? 2017-02-07T10:39:36.560