Scientists have found potentially habitable exoplanets beyond our solar system. Such planets include Gliese 667Cc, Kepler-22b, Kepler-62f, Kepler-186f, Kepler-442b, Kepler-452b, Kepler-1649c, Proxima Centauri b and TRAPPIST-1e. All these planets are considered among the most Earth-like due to their size, rocky composition and location within the "habitable zone", where liquid water could exist.