TRAPPIST-1: Perbedaan antara revisi

Pada tahun 2015, tim astronom yang dipimpin oleh [[Michaël Gillon]] di [[Universitas Liège]], [[Belgia]] menggunakan [[fotometri transit]] bersama dengan ''Transiting Planets and Planetesimals Small Telescope'' ([[TRAPPIST]]) di [[Observatorium La Silla]] di Chili untuk menemukan tiga planet seukuran Bumi yang sedang mengorbit bintang kerdil.<ref name="Guardian">{{cite web|url=https://www.theguardian.com/science/2016/may/02/could-these-newly-discovered-planets-orbiting-an-ultracool-dwarf-host-life|title=Could these newly-discovered planets orbiting an ultracool dwarf host life?|work=[[The Guardian]]|date=2 May 2016}}</ref><ref name="eso.org"/><ref>{{Cite web|url= http://www.popularmechanics.com/space/deep-space/a20671/three-planets-life-outside-the-solar-system/ |title=Three New Planets Are the Best Bets for Life |work=[[Popular Mechanics]] |date=2 May 2016 |access-date=2 May 2016}}</ref> Tanggal 22 Februari 2017, para ahli astronomi mengumumkan empat [[eksoplanet]] tambahan sekitar TRAPPIST-1. Selain TRAPPIST, pekerjaan ini memanfaatkan antara lain [[Very Large Telescope]] di Paranal dan [[Teleskop luar angkasa Spitzer]] NASA, dan menemukan total jumlah planet menjadi tujuh, di mana tiga di antaranya dianggap berada dalam [[zona layaklaik huni]].<ref>{{cite web |url=http://spaceref.com/astronomy/temperate-earth-sized-planets-found-in-extraordinarily-rich-planetary-system-trappist-1.html |title=Temperate Earth-Sized Planets Found in Extraordinarily Rich Planetary System TRAPPIST-1 |date=22 February 2017 |author= |publisher=SpaceRef |accessdate=11 February 2017 }}</ref><ref>{{Cite press release|url=https://exoplanets.nasa.gov/news/1419/nasa-telescope-reveals-largest-batch-of-earth-size-habitable-zone-planets-around-single-star/|title=NASA telescope reveals largest batch of Earth-size, habitable-zone planets around single star|newspaper=Exoplanet Exploration: Planets Beyond our Solar System|access-date=22 February 2017}}</ref> Yang lainnya juga mungkin dipercaya layaklaik dihuni (memiliki air cair di suatu tempat di permukaannya).<ref>{{cite web |url=http://spaceref.com/astronomy/temperate-earth-sized-planets-found-in-extraordinarily-rich-planetary-system-trappist-1.html |title=Temperate Earth-Sized Planets Found in Extraordinarily Rich Planetary System TRAPPIST-1 |date=22 February 2017 |author= |publisher=SpaceRef |accessdate=11 February 2017 }}</ref><ref>{{Cite news|url= https://exoplanets.nasa.gov/news/1419/nasa-telescope-reveals-largest-batch-of-earth-size-habitable-zone-planets-around-single-star/|title= NASA telescope reveals largest batch of Earth-size, habitable-zone planets around single star |newspaper= Exoplanet Exploration: Planets Beyond our Solar System |access-date= 22 February 2017 |publisher= [[NASA]]}}</ref>

TRAPPIST-1 merupakan sebuah bintang [[kerdilkatai ultradingin]], dengan kelas spektral M8,0 ± 0,5, yang kira-kira 8% massa dan 11% radius dari [[Matahari]]. Temperaturnya 2550 [[skala Kelvin|K]] dan sedikitnya berusia 500 juta tahun.<ref name="Gillon2016" /> Sebagai perbandingan, [[Matahari]] berusia sekitar 4,6 miliar tahun<ref>{{cite web |url=http://www.universetoday.com/18847/life-of-the-sun/ |title=What is the Life Cycle Of The Sun?|author=Williams, Matt |date=24 September 2016 |work= |publisher=Universe Today |accessdate=19 February 2011}}</ref> dan memiliki temperatur 5778 K.<ref>{{cite web |url=http://www.universetoday.com/18092/temperature-of-the-sun/ |title=Temperature of the Sun |author=Cain, Fraser |date=23 December 2015 |work= |publisher=Universe Today |accessdate=19 February 2011}}</ref>

Pada Februari 2017 para ahli astronomi mengumumkan penemuan sistem keplanetan dari bintang ini yang tersusun atas tujuh planet mirip Bumi (''[[TRAPPIST-1e|e]]'', ''[[TRAPPIST-1f|f]]'', ''[[TRAPPIST-1g|g]]'') tiga di antaranya mengorbit dalam zona layaklaik huni.<ref name="nasa.gov">{{Cite press release |title=NASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star |publisher=[[NASA]] |url=https://www.nasa.gov/press-release/nasa-telescope-reveals-largest-batch-of-earth-size-habitable-zone-planets-around}}</ref><ref name="JPL image">{{Cite web |url=http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21422 |title=TRAPPIST-1 Planet Lineup |website=jpl.nasa.gov}}</ref>