Hundreds of thousands of simulations show few possible exoplanets with climate conditions like ours.
Humans have long looked to the sky and wondered how many Earth-like worlds were out there. Thanks to powerful telescopes developed in recent years, both professional and amateur astronomers have discovered a plethora of planets orbiting other stars. In the three decades since the first confirmed exoplanet, they’ve indexed more than 4,000 — many of which sit at similar distances from their stars.
They found that about 90 percent of the planets orbiting within their star’s habitable zone would be ice-free. Barnes says that these ice belts are likely more common in exoplanets in the habitable zone due to the process of planet formation. The initial axial tilt of many planets when they form are closer to 90 degrees, he says, so the low tilt of our own planet is comparatively rare: “The Earth does have some unique properties which are potentially relevant for why life arose here.”
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