They discovered a planet with an ocean of water, but it's unlike anything we know

It is about The outer planets Kepler-138c and Kepler-138d. They are unlike anything we know of and this is where the huge problem arises. Although we’ve known about their existence for several years, we didn’t expect that they could be water worlds.

Latest observations of these globes, by Hubble Space Telescope and Spitzer Space Telescope, which revealed that they are lighter than terrestrial planets, but at the same time heavier than those dominated by hydrogen and helium. And here a problem arose in the world of astronomy.

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