Artistic representation of the planetary system of the star Kepler-138. We see Kepler-138 d’in the foreground, and closer to the star, Kepler-138 c. These two planets are probably composed mainly of water. The small planet Kepler-138 b is seen transiting in front of the star. A fourth planet, Kepler-138 e, is further away and not visible in the image. Credit: STScI.
. Artistic representation of the planetary system of the star Kepler-138. We see Kepler-138 d'in the foreground, and closer to the star, Kepler-138 c. These two planets are probably composed mainly of water. The small planet Kepler-138 b is seen transiting in front of the star. A fourth planet, Kepler-138 e, is further away and not visible in the image. Credit: STScI. A team led by UdeM astronomers has found evidence that two exoplanets orbiting a red dwarf star are "water worlds," planets where water makes up a large fraction of the volume.
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