A dense sub-Earth exoplanet, referred to as GJ 367b or Gliese 367 b, has been discovered, with some reports suggesting it is composed primarily of metal. The planet is said to have a very short orbital period, possibly as short as 7.7 or 8 hours, and is described as hot and dense, with a density comparable to that of lead. Its exact characteristics are still being reported, with some outlets describing it as a "super-Earth" and others as smaller than Earth.