Super-Earths Are Bigger and More Habitable Than Earth, and Astronomers Are Discovering More of the Billions They Think Are Out There

Astronomers now routinely discover planets orbiting stars outside of the solar system. The best chance astronomers have of finding life on another planet is likely to be on a super-Earth. Super-Earths are more massive than Earth but smaller than ice giants like Uranus and Neptune. Most habitable planet would have roughly twice the mass of Earth and be between 20 to 30 percent larger by volume. It would also have oceans that are shallow enough for light to stimulate life all the way to the seafloor and an average temperature of 77 degrees Fahrenheit.

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