Mercury (planet)
Mercury is one of four terrestrial planets in the Solar System, and is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of . Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan. Mercury consists of approximately 70% metallic and 30% silicate material. Mercury's density is the second highest in the Solar System at 5.427 g/cm, only slightly less than Earth's density of 5.515 g/cm. If the effect of gravitational compression were to be factored out from both planets, the materials of which Mercury is made would be denser than those of Earth, with an uncompressed density of 5.3 g/cm versus Earth's 4.4 g/cm.
List of transiting exoplanets
The most massive transiting exoplanet is KELT-1b which masses 27.23 M (making it a brown dwarf) while the least massive is Kepler-42d which masses less than 0.003 M or 0.9 M. The largest exoplanet known is HAT-P-32b which is 2.037 R. The smallest exoplanet known is also Kepler-42d which is 0.051 R or 0.57 R. The densest transiting exoplanet known is COROT-3b, which has density of 26.4 g/cm; the diffusest transiting planet known is Kepler-12b, which has density of only 0.111 g/cm. The longest period of any transiting planets is Kepler-1647b, which takes 1107 days to orbit its (double) stars. The shortest period is Kepler-42c, which takes just 0.45 days to orbit its star