Atmosphere of Mercury Atmosphere of Mercury Mercury has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor, with a combined pressure level of about 10 bar (1 nPa). The exospheric species originate either from the Solar wind or from the planetary crust. Solar light pushes the atmospheric gases away from the Sun, creating a comet-like tail behind the planet. The existence of a Mercurian atmosphere had been contentious before 1974, although by that time a consensus had formed that Mercury, like the Moon, lacked any substantial atmosphere. This conclusion was confirmed in 1974
Fear of a Black Planet Fear of a Black Planet Fear of a Black Planet is the third studio album by American hip hop group Public Enemy. It was released on April 10, 1990, by Def Jam Recordings and Columbia Records. For the album, Public Enemy's Bomb Squad production team sought to expand on the dense, sample-layered sound of the group's 1988 record "It Takes a Nation of Millions to Hold Us Back". Having fulfilled their initial creative ambitions with that album, Public Enemy aspired to create what lead rapper Chuck D called "a deep, complex album". Their songwriting was partly inspired by the controversy