Trappist-1 planetary system

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In a press release on February 22, 2017, NASA announced the discovery of the most Earth-sized planets found in the habitable zone of a single star, called TRAPPIST-1.


This system of seven rocky worlds–all of them with the potential for water on their surface–is an exciting discovery in the search for life on other worlds.

There is the possibility that future study of this unique planetary system could reveal conditions suitable for life.

Astronomers at the National Aeronautics and Space Administration (Nasa) have detected no less than seven roughly Earth-sized worlds orbiting a dwarf star in the system, it was announced today.

Scientists had previously only identified a tiny number of so-called “exoplanets”, which are believed to have the qualities needed to support life.

However, the new system contains an unprecedented number of Earth-sized, probably rocky planets, and is being hailed as an “accelerated leap forward” in the search for extraterrestrial life.

Three of the new planets are said to be particularly promising because they could sustain oceans. Thomas Zurbuchen, associate administrator of Nasa’s Science Mission Directorate, told a press conference in Washington: “This gives us a hint that finding a second Earth is not a matter of ‘if’, but ‘when’.”