TRAPPIST-1 f is one of seven roughly Earth-sized planets orbiting TRAPPIST-1, an ultracool red dwarf about 40 light-years away in Aquarius. The discovery of the full system, made with the Spitzer Space Telescope and ground-based telescopes including TRAPPIST in Chile, was announced in a paper in Nature. Planet f is a little smaller than Earth, with a year lasting about nine days, and its orbit lies within the star's habitable zone, where liquid water could exist on the surface. Its density suggests it may contain a lot of water or ice. Because the star is so dim, the planets are close together, and a person standing on one would see its neighbours as large objects in the sky.
Before and after
- 12 January 2017Despacito
- 20 January 2017First inauguration of Donald Trump
- 27 January 2017Executive Order 13769
- 22 February 2017Discovery of TRAPPIST-1e
- 22 February 2017Discovery of TRAPPIST-1 f
- 22 February 2017Discovery of TRAPPIST-1 g
- 26 February 2017I Can't Go On
- from March 2017 to August 20172017 Venezuelan protests
- 22 March 20172017 Westminster attack
More in Universe & space
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The era
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