Heaven, the Heavens or Seven Heavens, is a common religious, cosmological or metaphysical term for the physical or transcendent place from which heavenly beings (such as a Sky deity, God, angels, King or Queen of Heaven, Heavenly Father or Heavenly Mother or Son of Heaven, heavenly saints or venerated ancestors) originate, are enthroned or inhabit. It is commonly believed that heavenly beings can descend to earth or take on earthly flesh and that earthly beings can ascend to Heaven in the afterlife or in exceptional cases enter Heaven alive. Heaven is often described as a "higher place", the holiest place, a Paradise, in contrast to Hell or the Underworld or the "low places", and universally or conditionally accessible by earthly beings according to various standards of divinity, goodness, piety, faith, or other virtues or right beliefs or simply the Will of God. Some believe in the possibility of a Heaven on Earth in a World to Come or of a World Tree which connects the heavens, the world, and the underworld.