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|orbit=[[Oort cloud]] '''C/2020 F8 (SWAN)''', or '''Comet SWAN''', is an [[Oort cloud]] [[comet]] that was discovered in images taken by the Solar Wind Anisotrop ...

{{Short description|Oort cloud comet}} | orbit = [[Oort cloud]] ...

An observation arc less than 30 days can make it difficult to recover an [[Inner Solar System]] object more than a year after the last observation, and may [[Oort cloud]] comet [[C/2017 K2]] was announced when it had a short 2.6 day observation ...

...eous corona that surrounds the Milky Way. Inspired by this proposal, [[Jan Oort]], of Leiden University, Netherlands, proposed that cold gas clouds might b ...well as their slower-moving counterparts known as [[intermediate-velocity cloud]]s (IVCs). Several astronomers proposed hypotheses (which later proved to b ...

...tside Neptune's orbit. Far beyond this region is the vast spherical [[Oort cloud]] enshrouding the Solar System, whose presence was deduced from the orbits ...d to determine the outer limit of the Kuiper belt and directly detect Oort cloud objects out to 10,000 AU. Such objects are too small to detect with cu ...

...have a stable source located beyond 1,000 astronomical units (in the Oort cloud) where they come from", notes Carlos de la Fuente Marcos. "But if they are ==Oort cloud and comets== ...

{{short description|Oort cloud comet}} | orbit = [[Oort cloud]] ...

Antimatter comets thought to exist in the [[Oort cloud]] were in the 1990s hypothesized as one possible explanation for [[gamma-ra ...|title=Gamma-Ray Bursts from Comet-Antimatter Comet Collisions in the Oort Cloud|url=http://link.aip.org./link/?APCPCS/384/744/1|last=Dermer|first=Charles D ...

| orbit = [[Oort cloud]] '''C/2013 A1''' ('''Siding Spring''') is an [[Oort cloud]] [[comet]] discovered on 3 January 2013 by [[Robert H. McNaught]] at [[Sid ...

| [[Comet ISON|C/2012 S1 (ISON)]]<br />(weakly hyperbolic<br />Oort Cloud comet) || {{cvt|0.2|km/s|au/years|2|disp=br}}<ref name="Note-1" /> Interstellar comets occasionally pass through the inner [[Solar System]]<ref name="Valtonen" /> and approach with random velocities ...

...he gravitational collapse of a pocket of matter within a [[giant molecular cloud]]. The infalling material possesses some amount of [[angular momentum]], wh ...d]]; only the inner [[Oort cloud]] has a toroid-like shape. The outer Oort cloud is more spherical in shape. ...

...ng | first1 = RP | last2 = Merrifield | first2 = MR | title = Refining the Oort and Galactic constants | journal = Monthly Notices of the Royal Astronomic ...The halo may be further subdivided into an inner and outer halo, with the inner halo having a net prograde motion with respect to the Milky Way and the out ...

...Galaxy rotation curve|galactic rotation]] by [[Bertil Lindblad]] and [[Jan Oort]]. In 1924, Dutch astronomer [[Jan Oort]] [[:Category:Discoveries by Jan Oort|discovered]] the [[galactic halo]], a group of stars orbiting the [[Milky W ...

...leislordscie00pais}}</ref> and disproves the existence of the hypothesized inner planet [[Vulcan (hypothetical planet)|Vulcan]]. ...ttps://web.archive.org/web/20210126014353/https://www.space.com/16401-oort-cloud-the-outer-solar-system-s-icy-shell.html |url-status=live }}</ref> and in 19 ...

...hypothesis could also explain ETNOs with orbits [[perpendicular]] to the [[inner planets]]<ref name=TAJ201601/> and others with extreme inclinations,<ref na ...proposed for Planet Nine, with the observed clustering more likely if the inner edge is at 200&nbsp;AU. Unlike the gas nebula, the planetesimal disk is lik ...

...awai‘i and Chile (iotw2225c).jpg|thumb|upright=2|The [[interplanetary dust cloud]] illuminated and visible as [[zodiacal light]], with its parts the ''false ...ch in turn feed and maintain the [[interplanetary dust cloud|Zodiacal dust cloud]].<ref>{{cite journal |last1=Whipple |first1=F.L. |title=A comet model. I. ...

...319173919/https://www.salon.com/2019/03/12/oumuamua-sped-up-as-it-left-the-inner-solar-system-this-might-be-why_partner/ |url-status=live }}</ref><ref name= ...ion.png|thumb|[[Hyperbolic trajectory]] of {{okina}}Oumuamua through the [[inner Solar System]] with the Sun at the [[focus (geometry)|focus]].<ref>{{cite w ...

...ance, 2I/Borisov's nucleus was surrounded by a [[Coma (cometary)|coma]], a cloud of dust and gas.<ref name=Greskno2019/> ...elion]] (closest approach to the Sun)<ref name=JPL-Data/> and was near the inner edge of the asteroid belt. In late December, it made its closest approach t ...

...nter could trigger a 40-fold increase in the number of comets reaching the inner Solar System. Impacts from these comets could trigger a mass extinction of ...ns. Among the deleterious effects resulting from a major impact event is a cloud of fine dust ejecta blanketing the planet, blocking some [[Diffuse sky radi ...

...burn out. The Sun will likely expand sufficiently to overwhelm most of the inner planets (Mercury, Venus, and possibly Earth) but not the giant planets, inc ...te=August 2012 |title=Cupid is doomed: An analysis of the stability of the inner uranian satellites |journal=Icarus |volume=220 |issue=2 |pages=911–921 |arx ...