Why Most “Earth-Like” Exoplanets Aren’t Actually Earth-Like at All
The Kepler-442b Problem When astronomers announced the discovery of Kepler-442b in 2015, headlines blazed with phrases like “Earth’s twin” and “potentially habitable super-Earth.” The planet orbits within its star’s habitable zone, where liquid water could theoretically exist on the surface. But here’s what those excited headlines didn’t mention: Kepler-442b receives about 70% more radiation than […]