Scientists describe a tiny, molten metal exoplanet in unprecedented detail

Scientists are getting better at characterizing exoplanets, and that's leading to some surprising discoveries. As Reutersreports, a DLR-led team has determined that the relatively nearby (31 light-years) planet GJ 367b is significantly smaller than Earth at 5,592 miles across, but is more dense than Earth -- it's about as dense as iron, and 86 percent of the planet is made from the metal. The planet more closely resembles Mercury than humanity's homeworld. GJ 367b certainly isn't habitable. It's...