Planets beyond Neptune
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2]
Page Revisions
| Year | Metadata | Sections | Top Words | First Paragraph |
| 2018 |
252693 characters 22 sections 47 paragraphs 19 images 397 internal links 151 external links |
3. Discovery of further trans-Neptunian objects 4. Subsequently proposed trans-Neptunian planets |
pluto 0.365 lowell 0.267 au 0.248 planet 0.208 neptune 0.204 neptunian 0.188 planets 0.182 trans 0.178 sedna 0.164 object 0.154 objects 0.128 observatory 0.127 uranus 0.109 tombaugh 0.106 verrier 0.097 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2017 |
247074 characters 18 sections 47 paragraphs 19 images 397 internal links 148 external links |
3. Discovery of further trans-Neptunian objects 4. Subsequently proposed trans-Neptunian planets |
pluto 0.371 lowell 0.266 au 0.247 neptune 0.210 planet 0.207 neptunian 0.187 planets 0.181 trans 0.177 sedna 0.164 object 0.153 objects 0.127 observatory 0.127 uranus 0.109 tombaugh 0.105 mass 0.103 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2016 |
235336 characters 18 sections 47 paragraphs 19 images 392 internal links 127 external links |
3. Discovery of further trans-Neptunian objects 4. Subsequently proposed trans-Neptunian planets |
pluto 0.373 lowell 0.268 au 0.241 neptune 0.212 planet 0.205 neptunian 0.188 planets 0.182 trans 0.179 sedna 0.165 object 0.155 objects 0.128 observatory 0.128 uranus 0.109 tombaugh 0.106 mass 0.101 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2015 |
202433 characters 16 sections 41 paragraphs 18 images 372 internal links 94 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.391 lowell 0.286 neptune 0.219 au 0.212 planet 0.205 planets 0.185 neptunian 0.183 trans 0.174 sedna 0.164 object 0.154 observatory 0.136 objects 0.121 uranus 0.117 tombaugh 0.113 verrier 0.104 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2014 |
188884 characters 16 sections 40 paragraphs 17 images 367 internal links 76 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.358 lowell 0.329 au 0.219 planet 0.209 neptune 0.203 neptunian 0.188 trans 0.180 planets 0.170 sedna 0.169 object 0.141 observatory 0.127 objects 0.125 uranus 0.121 tombaugh 0.117 verrier 0.107 |
|
| 2013 |
187528 characters 17 sections 39 paragraphs 17 images 362 internal links 75 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.375 lowell 0.345 neptune 0.213 planet 0.212 au 0.180 planets 0.172 neptunian 0.138 trans 0.134 observatory 0.133 object 0.129 uranus 0.126 objects 0.125 tombaugh 0.122 verrier 0.112 ketakar 0.110 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2012 |
187465 characters 17 sections 39 paragraphs 18 images 362 internal links 75 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.376 lowell 0.345 neptune 0.213 planet 0.210 planets 0.173 au 0.172 neptunian 0.138 trans 0.135 observatory 0.133 object 0.129 uranus 0.126 objects 0.126 tombaugh 0.123 verrier 0.112 ketakar 0.110 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2011 |
184112 characters 17 sections 39 paragraphs 14 images 362 internal links 75 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.380 lowell 0.337 planet 0.215 neptune 0.208 planets 0.180 au 0.158 neptunian 0.140 uranus 0.136 trans 0.136 observatory 0.127 tombaugh 0.124 object 0.118 objects 0.116 verrier 0.114 ketakar 0.111 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century but culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2010 |
174649 characters 17 sections 37 paragraphs 14 images 350 internal links 63 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.394 lowell 0.337 planet 0.212 neptune 0.207 planets 0.181 au 0.155 neptunian 0.145 trans 0.141 observatory 0.132 tombaugh 0.129 uranus 0.124 objects 0.120 verrier 0.118 ketakar 0.115 discrepancies 0.114 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century but culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2009 |
144458 characters 17 sections 34 paragraphs 12 images 195 internal links 59 external links |
3. Discovery of further trans-Neptunian objects |
pluto 0.392 lowell 0.324 planet 0.215 neptune 0.206 planets 0.176 au 0.161 neptunian 0.151 trans 0.147 discrepancies 0.136 tombaugh 0.133 observatory 0.129 verrier 0.123 ketakar 0.120 objects 0.118 le 0.112 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century but culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2008 |
130813 characters 16 sections 32 paragraphs 12 images 182 internal links 57 external links |
3. Observed trans-Neptunian objects |
pluto 0.395 lowell 0.321 planet 0.213 neptune 0.195 planets 0.170 au 0.157 neptunian 0.155 trans 0.151 discrepancies 0.140 tombaugh 0.138 verrier 0.126 observatory 0.124 ketakar 0.124 le 0.116 objects 0.115 |
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century but culminated at the start of the 20th with Percival Lowell 's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the gas giants, particularly Uranus and Neptune, [1] speculating that the gravity of a large unseen planet could have perturbed Uranus enough to account for the irregularities. [2] |
| 2007 |
25544 characters 8 sections 18 paragraphs 0 images 62 internal links 11 external links |
discrepancies 0.414 neptune 0.314 pluto 0.265 planet 0.235 lowell 0.198 search 0.127 planets 0.126 hypothesis 0.123 harrington 0.113 uranus 0.112 orbits 0.111 ecliptic 0.094 verrier 0.093 recognized 0.091 tombaugh 0.090 |
Planet X is a large hypothetical planet beyond Neptune . The scientific basis of the Planet X hypothesis was broadly discounted in the early 1980s and today no significant portion of the scientific community believes it to exist. |
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| 2006 |
22935 characters 8 sections 17 paragraphs 0 images 65 internal links 9 external links |
discrepancies 0.434 neptune 0.293 planet 0.249 pluto 0.223 lowell 0.184 planets 0.151 hypothesis 0.137 orbits 0.121 search 0.118 objects 0.106 kuiper 0.106 harrington 0.105 existence 0.105 calculated 0.096 object 0.095 |
Planet X is a large hypothetical planet with an orbit beyond that of Neptune . The scientific basis of the Planet X hypothesis was broadly discounted in the early 1990s and today no significant portion of the scientific community believes it to exist. |
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| 2005 |
18120 characters 8 sections 13 paragraphs 0 images 71 internal links 3 external links |
discrepancies 0.413 pluto 0.273 neptune 0.269 planet 0.240 lowell 0.226 planets 0.164 ub313 0.134 objects 0.130 kuiper 0.130 existence 0.128 search 0.121 hypothesis 0.112 hypothetical 0.110 orbits 0.106 recognized 0.104 |
Planet X was a large hypothetical planet orbiting beyond the orbit of Neptune . (The X stands for unknown, rather than the Roman number 10.) Its existence, first as a ninth planet, and after 1930 as a tenth, was postulated on the basis of apparent discrepancies in the orbits of the gas giants , especially those of Uranus and Neptune. Those discrepancies have largely been resolved by modern measurement, removing the basis for Planet X. |
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| 2004 |
11238 characters 6 sections 6 paragraphs 0 images 43 internal links 0 external links |
pluto 0.367 lowell 0.304 neptune 0.282 discrepancies 0.238 planet 0.236 au 0.209 hypothetical 0.149 prediction 0.139 calculation 0.122 orbit 0.114 ironically 0.112 sized 0.112 theoretical 0.104 mathematicians 0.101 persephone 0.101 |
Planet X (or Transpluto) is a hypothetical planet beyond Pluto . Its existence was argued for on the basis of apparent discrepancies in the orbit of Neptune . A common name for this hypothetical planet is Persephone . |
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| 2003 |
6440 characters 4 sections 6 paragraphs 0 images 27 internal links 0 external links |
neptune 0.349 pluto 0.303 discrepancies 0.295 planet 0.278 lowell 0.151 ironically 0.139 sized 0.139 theoretical 0.129 mathematicians 0.126 miscalculated 0.126 spectacularly 0.126 hypothetical 0.123 tenth 0.122 ecliptic 0.119 revising 0.118 |
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| 2002 |
3828 characters 0 sections 5 paragraphs 0 images 22 internal links 0 external links |
pluto 0.368 neptune 0.303 planet 0.262 discrepancies 0.239 lowell 0.183 ironically 0.169 sized 0.168 miscalculated 0.153 hypothetical 0.149 tenth 0.148 ecliptic 0.145 revising 0.143 concluding 0.131 powerful 0.129 exists 0.128 |
Planet X is a hypothetical planet beyond Pluto . Its existence was argued for on the basis of apparent discrepancies in the orbit of Neptune . |
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| 2001 |
2161 characters 0 sections 3 paragraphs 0 images 2 internal links 0 external links |
neptune 0.397 pluto 0.322 discrepancies 0.314 sized 0.221 planet 0.196 ecliptic 0.190 concluding 0.171 powerful 0.170 exists 0.167 badly 0.166 apparent 0.145 explain 0.135 orbit 0.129 mass 0.125 comprehensive 0.125 |
Planet X is a hypothetical planet beyond Pluto . Its existence was argued for on the basis of apparent discrepancies in the orbit of Neptune. This led to the discovery for Pluto, but Pluto's mass was not sufficent to explain Neptune's orbit, so the search continued. However these apparent discrepancies were resolved when the Voyager space probes discovered that Neptune's mass had been badly calculated; with Neptune's newly discovered mass taken into account, there was no longer a need for any new planet to explain Neptune's orbit. |