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Planetary system
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====Comets==== {{main|Comet}} {{As of|2014|11}} there are 5,253 known Solar System comets<ref>{{cite web |last=Johnston |first=Robert |title=Known populations of solar system objects |url=http://www.johnstonsarchive.net/astro/sslist.html |date=August 2, 2014 |access-date=January 19, 2015 |archive-date=June 9, 2019 |archive-url=https://web.archive.org/web/20190609054832/http://www.johnstonsarchive.net/astro/sslist.html |url-status=dead }}</ref> and they are thought to be common components of planetary systems. The first exocomets were detected in 1987<ref name="Ferlet et al.1987">{{cite journal | bibcode=1987A&A...185..267F |title=The Beta Pictoris circumstellar disk. V - Time variations of the CA II-K line|author1=Ferlet, R. |author2=Vidal-Madjar, A. |author3=Hobbs, L. M.|year=1987|journal=[[Astronomy and Astrophysics]]|volume=185|pages=267β270}}</ref><ref name="Beust1990">{{cite journal |bibcode=1990A&A...236..202B |title=The Beta Pictoris circumstellar disk. X - Numerical simulations of infalling evaporating bodies |last1=Beust |first1=H. |last2=Lagrange-Henri |first2=A.M. |last3=Vidal-Madjar |first3=A. |last4=Ferlet |first4=R. |volume=236 |year=1990 |pages=202β216 |journal=[[Astronomy and Astrophysics]]}}</ref> around [[Beta Pictoris]], a very young [[A-type main-sequence star]]. There are now a total of 11 stars around which the presence of exocomets have been observed or suspected.<ref name="Lagrange-Henri et al.1990">{{cite journal| bibcode=1990A&A...227L..13L |title=HR 10 - A new Beta Pictoris-like star?|author1=Lagrange-Henri, A. M. |author2=Beust, H. |author3=Ferlet, R. |author4=Vidal-Madjar, A. |author5=Hobbs, L. M.|year=1990|journal=[[Astronomy and Astrophysics]]|volume=227|pages=L13βL16}}</ref><ref name="Lecavelier Des Etangs et al.1997">{{cite journal| bibcode=1997A&A...325..228L |title=HST-GHRS observations of candidate Ξ² Pictoris-like circumstellar gaseous disks.|author=Lecavelier Des Etangs, A.|display-authors=etal|year=1997|journal=[[Astronomy and Astrophysics]]|volume=325|pages=228β236}}</ref><ref name="Welsh et al.2013">{{cite journal| bibcode=2013PASP..125..759W |title=Circumstellar Gas-Disk Variability Around A-Type Stars: The Detection of Exocomets?|author1=Welsh, B. Y. |author2=Montgomery, S. |name-list-style=amp |year=2013|journal=[[Publications of the Astronomical Society of the Pacific]]|volume=125|issue=929|pages=759β774|doi=10.1086/671757|doi-access=free}}</ref><ref name="Kiefer et al.2014">{{cite journal| bibcode=2014A&A...561L..10K |title=Exocomets in the circumstellar gas disk of HD 172555|author1=Kiefer, F. |author2=Lecavelier Des Etangs, A.|display-authors=etal|year=2014|journal=[[Astronomy and Astrophysics]]|volume=561|pages=L10|doi=10.1051/0004-6361/201323128|arxiv = 1401.1365 |s2cid=118533377}}</ref> All discovered exocometary systems ([[Beta Pictoris]], [[HR 10]],<ref name="Lagrange-Henri et al.1990"/> [[51 Ophiuchi]], [[HR 2174]],<ref name="Lecavelier Des Etangs et al.1997"/> [[49 Ceti]], [[5 Vulpeculae]], [[2 Andromedae]], [[HD 21620]], [[HD 42111]], [[HD 110411]],<ref name="Welsh et al.2013" /><ref name="Space-20130107">{{cite web |title='Exocomets' Common Across Milky Way Galaxy |url=http://www.space.com/19156-exocomets-alien-solar-systems.html |date=January 7, 2013 |publisher=Space.com |access-date=January 8, 2013 }}</ref> and more recently [[HD 172555]]<ref name="Kiefer et al.2014" />) are around very young [[Stellar classification#Class A|A-type stars]].
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