Sayari-nje : Tofauti kati ya masahihisho
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Mstari 3:
[[File:Exoplanet Discovery Methods Bar.png|thumb|300px|Idadi ya Sayari za Nje, kufuatana na mwaka wa kugunduliwa hadi Septemba 2014.]]
Mnamo mwaka 2017 zaidi ya sayari za nje 2000 zilitambuliwa tayari zianzoyozunguka nyota mbalibali. <ref>{{cite web|url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/ExoTables/nph-exotbls?dataset=planets|title=Exoplanet Archive Planet Counts|publisher=}}</ref><ref name="kepler1700">{{cite web |last1=Johnson |first1=Michele |last2=Harrington |first2=J.D. |title=NASA's Kepler Mission Announces a Planet Bonanza, 715 New Worlds |url=http://www.nasa.gov/ames/kepler/nasas-kepler-mission-announces-a-planet-bonanza/ |date=February 26, 2014 |work=[[NASA]] |accessdate=February 26, 2014 }}</ref><ref>{{cite web|url=http://phl.upr.edu/projects/habitable-exoplanets-catalog|title=The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo|publisher=}}</ref>
Hadi miaka ya 1990 idadi kubwa ya wanaastronomia bado walihangaika kama sayari za nje ziko au la. Mwaka 1992 watafiti [[Aleksander Wolszczan]] na [[Dale Frail]] waliofanya kazi ya [[astronomia ya redio]] walitangaza kugunduliwa kwa sayari mbili zinazozunguka [[nyota ya pigapiga]] [[PSR 1257+12]].<ref name="Wolszczan">{{Cite journal | last1 = Wolszczan | first1 = A. |bibcode=1992Natur.355..145W| last2 = Frail | first2 = D. A. | doi = 10.1038/355145a0 | title = A planetary system around the millisecond pulsar PSR1257 + 12 | journal = Nature | volume = 355 | issue = 6356 | pages = 145–147 | year = 1992 | pmid = | pmc = }}</ref> Miaka michache baadaye taarifa hii ilithebitishwa na wagunduzi wengine.
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