Kepler-452b was hailed as Earth’s “cousin” due to its location in the habitable zone and Earth-like size. But its surface may be uninhabitable. Scientists have identified four major problems ...

It's possible that the world would have clouds in its atmosphere. Kepler-452b is a near-Earth-size world in the habitable zone of stars similar to our Sun. The star is about 10 percent larger and 20 ...