Editing Solar System (section)

=== Comparison with extrasolar systems ===
Compared to many extrasolar systems, the Solar System stands out in lacking planets interior to the orbit of Mercury.<ref name="Martin082015">{{Cite journal |last1=Martin |first1=Rebecca G. |last2=Livio |first2=Mario |year=2015 |title=The Solar System as an Exoplanetary System |journal=[[The Astrophysical Journal]] |volume=810 |issue=2 |page=105 |arxiv=1508.00931 |bibcode=2015ApJ...810..105M |doi=10.1088/0004-637X/810/2/105 |s2cid=119119390}}</ref><ref>{{Cite journal |last=Kohler |first=Susanna |date=25 September 2015 |title=How Normal is Our Solar System? |url=https://aasnova.org/2015/09/25/how-normal-is-our-solar-system |url-status=live |journal=Aas Nova Highlights |publisher=American Astronomical Society |page=313 |bibcode=2015nova.pres..313K |archive-url=https://web.archive.org/web/20220407043952/https://aasnova.org/2015/09/25/how-normal-is-our-solar-system |archive-date=7 April 2022 |access-date=31 March 2022}}</ref> The known Solar System lacks [[super-Earth]]s, planets between one and ten times as massive as the Earth,<ref name="Martin082015" /> although the hypothetical [[Planet Nine]], if it does exist, could be a super-Earth orbiting in the edge of the Solar System.<ref>{{Cite journal |last1=Sheppard |first1=Scott S. |author-link=Scott S. Sheppard |last2=Trujillo |first2=Chadwick |author-link2=Chad Trujillo |date=7 December 2016 |title=New extreme trans-Neptunian objects: Toward a super-Earth in the outer solar system |journal=The Astronomical Journal |volume=152 |issue=6 |page=221 |arxiv=1608.08772 |bibcode=2016AJ....152..221S |doi=10.3847/1538-3881/152/6/221 |issn=1538-3881 |s2cid=119187392 |doi-access=free}}</ref>

Uncommonly, it has only small terrestrial and large gas giants; elsewhere planets of intermediate size are typical—both rocky and gas—so there is no "gap" as seen between the size of Earth and of Neptune (with a radius 3.8 times as large). As many of these super-Earths are closer to their respective stars than Mercury is to the Sun, a hypothesis has arisen that all planetary systems start with many close-in planets, and that typically a sequence of their collisions causes consolidation of mass into few larger planets, but in case of the Solar System the collisions caused their destruction and ejection.<ref name="Martin082015" /><ref>{{Cite journal |last1=Volk |first1=Kathryn |last2=Gladman |first2=Brett |year=2015 |title=Consolidating and Crushing Exoplanets: Did it happen here? |journal=[[The Astrophysical Journal Letters]] |volume=806 |page=L26 |arxiv=1502.06558 |bibcode=2015ApJ...806L..26V |doi=10.1088/2041-8205/806/2/L26 |s2cid=118052299 |number=2}}</ref>

The orbits of Solar System planets are nearly circular. Compared to many other systems, they have smaller [[orbital eccentricity]].<ref name="Martin082015" /> Although there are attempts to explain it partly with a bias in the [[Doppler spectroscopy|radial-velocity detection method]] and partly with long interactions of a quite high number of planets, the exact causes remain undetermined.<ref name="Martin082015" /><ref>{{Cite journal |last1=Goldreich |first1=Peter |last2=Lithwick |first2=Yoram |last3=Sari |first3=Re'em |year=2004 |title=Final Stages of Planet Formation |journal=[[The Astrophysical Journal]] |volume=614 |issue=1 |pages=497–507 |arxiv=astro-ph/0404240 |bibcode=2004ApJ...614..497G |doi=10.1086/423612 |s2cid=16419857}}</ref>