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sharpiefan
01-25-2018, 01:50 PM
Two Trappist-1 planets have watery oceans, most likely to be inhabitable (ARTICLE LINK) (http://www.theregister.co.uk/2018/01/24/trappist1_planets_water_life/)



Excerpt
A team of scientists have identified two out of the seven planets in the Trappist-1 system as the most likely to be habitable, according to a new study.

Since itsdiscovery, announced earlier last year, the Trappist-1 system has been of great interest to astronomers – and anyone else sick of Earth, to be honest.

A previous study picked out three exoplanets in the habitable zone. Now, a paper, to be published in Astronomy and Astrophysics (here's the free Arxiv version), has narrowed that number down to two, in termsof hospitable conditions.

Located about 39 light years from our home world, Trappist-1 is similar to our Solar System. It has seven planets – rather than our eight – circling a cool red dwarf star. The exoplanets are similar in size to Earth, and researchers have previously detected clues that liquid water may exist for the outer planets e, f and g.
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Amy Barr, a senior scientist from the Planetary Science Institute, a private, nonprofit corporation focused on Solar System exploration, said: “Assuming the planets are composed of water ice, rock, and iron, we determine how much of each might be present, and how thick the different layers would be. Because the masses and radii of the planets are not very well-constrained, we show the full range of possible interior structures and interior compositions.”


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