Astronomers are seeking to understand the types of exoplanets, and their atmospheric and environmental conditions, that could potentially host life outside of our solar system. But since we can't visit exoplanets for an up-close look, data from telescopes and modeling of atmospheres, climates and environments provide the picture we can't see. The models, hypotheses and lab experiments of exoplanet researchers are a test bed to question what's possible. Among the search for weird exoplanets - some so alien when compared with our own solar system - many researchers are focused on a key phrase: "potentially habitable." Exoplanets that are referred to as potentially habitable don't show signs of life. It means that the planet is at the right distance from its star so that it's in the so-called Goldilocks zone, or habitable zone - not too hot, not too cold and just right, within a possible surface temperature range where liquid water could exist on the planet's surface.
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