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They are the most common type of planet observed in our Milky Way galaxy - two to three times the diameter of Earth but smaller than Neptune, and orbiting closer to their stars than our solar system's innermost planet Mercury does to the sun.
NASA's James Webb Space Telescope may have found signs of life on exoplanet K2-18b through the detection of dimethyl sulphide (DMS).
The National Aeronautics and Space Administration recently announce it would use the successor to Hubble's legacy, the James Webb Space Telescope, to observe and record more information about sup-Neptune planets.