Most of the information we have about the planets is basic. It is difficult to predict what these worlds are actually like because researchers don't know much more than the planet's mass and distance from the star. Researchers are able to learn more about the density of a planet thanks to new tools and techniques.
There are two planets that seem to be water worlds, with oceans that are 500 times deeper than the oceans on Earth.
It wasn't until recently that the density of the planets was revealed by the data from Hubble and Spitzer It has been shown that up to half of the planets volume could be made up of water.
"We used to think that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-earths." We now know that the two planets, Kepler-138 c and d, are different in nature and that a large portion of their entire volume is water. Water worlds, a type of planet that was theorized to exist for a long time, is the best proof yet.
We should not be thinking about the planets in our solar system but the moons. They would hold large water-vapor envelopes.
The planets in question have very hot atmospheres and wouldn't be like any place in our solar system. They would have a thick atmosphere of steam and liquid water.
We might see more similar worlds in the future. As our instruments and techniques become more sensitive, we might find a lot more of these water worlds.
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