We learned from school that Earth is the only planet in the universe where living things can survive, but what if there’s more? Based on new research, Earth may not be the most suited place for life when you try to look at other superhabitable planets closely. And as scientists look outside of our solar system for habitable planets, planets that are like Earth may not be the most suitable answer.

Dirk Schulze-Makuch, lead study author and professor for astrobiology and planetary habitability at Washington State University, said in a study published in the journal Astrobiology, “We are so focused on finding a mirror image of Earth that we may overlook a planet that is even more well suited for life,” in an email to CNN. In the latest research, Schulze-Makuch, together with his coauthors, classified 24 exoplanets and exoplanet candidates (planets that are not yet positively verified as exoplanets). The distances of these planets are more than 100 light-years away, which could be potential superhabitable planets with situations more fitting for survival than Earth.

Nevertheless, the authors announced that it does not suggest they have proved that there is life on these planets. Rather, it means that these planets could sustain life. “We caution that while we search for superhabitable planets, that doesn’t mean that they necessarily contain life (or even complex life),” Schulze-Makuch said. “A planet can be habitable or superhabitable but uninhabited. This has to do with the natural history of the planet. There could have been a calamity (like a nearby Supernova explosion).”

For Schulze-Makuch, a superhabitable planet is “any planet that has more biomass and biodiversity than our current Earth. Essentially, it would be slightly older, bigger, warmer, and wetter than Earth.” “The habitability of our planet has also changed throughout our natural history,” he said. “For example, Earth in the Carboniferous period with all the swamps and rainforest (that produced most of our current gas and oil) was likely more habitable — superhabitable using our definition — than Earth currently.”