What is TRAPPIST-1?
[[File:Trappist1-final-hour-long-cadence.gif|300px|thumb|Artists [[Kepler space telescope|Kepler]] of the image of TRAPPIST-1.]] '''TRAPPIST-1''' (or '''2MASS J23062928-0502285''') is an ultracool [[red dwarf]] [[star]] located almost 40 [[Light year|light years]] away from the [[Sun]] in the [[constellation]] of [[Aquarius (constellation)|Aquarius]]. The red dwarf is known for having seven Earth-sized [[terrestial planet|rocky]] planets around it.<ref>https://www.space.com/41714-water-rich-exoplanets-trappist-1-system.html | TRAPPIST-1 Worlds Are Rocky and Rich in Water, New Research Uncovers | September 05, 2018</ref> These planets were discovered between [[2016]] and [[2017]], and are likely rocky and some may even have liquid water on them.<ref>https://www.nasa.gov/feature/jpl/new-clues-to-trappist-1-planet-compositions-atmospheres | New Clues to TRAPPIST-1 Planet Compositions, Atmospheres | Feb. 5, 2018 | [[NASA]] </ref> Four of these planets ([[TRAPPIST-1d|d]], [[TRAPPIST-1e|e]], [[TRAPPIST-1f|f]], and [[TRAPPIST-1g|g]]) are in the [[habitable zone]], so they are most likely to have liquid water. Three other planets here ([[TRAPPIST-1b|b]], [[TRAPPIST-1c|c]], and [[TRAPPIST-1h|h]]) are not in the habitable zone, and are likely not habitable. ==Planets== In August of [[2017]], the [[Hubble Space Telescope]] possibly found traces of possible water in the atmospheres of some of the TRAPPIST-1 planets.<ref>https://www.spacetelescope.org/news/heic1713/ {{Webarchive|url=https://web.archive.org/web/20190125141001/https://www.spacetelescope.org/news/heic1713/ |date=2019-01-25 }} | Hubble delivers first hints of possible water content of TRAPPIST-1 planets | 31 August, 2017</ref><ref>{{cite web | url=https://indianexpress.com/article/technology/science/first-evidence-of-water-found-on-trappist-1-planets-4827977/ | title=First evidence of water found on TRAPPIST-1 planets | date=4 September 2017 }}</ref> [[File:PIA22093-TRAPPIST-1-PlanetLineup-20180205.jpg|thumb|Impression of the planets around TRAPPIST-1.]] *'''T