Terra incognita refer to the hypothesized continent Terra Australis Incognita ("The unknown land of the South"), as seen in the Theatrum Orbis Terrarum map by Abraham Ortelius (1570). During the 19th century "terra incognita" disappeared from maps of the earth, since both the coastlines and the inner parts of the continents had been fully explored. But the bottoms of the seas remain mostly un-mapped, as do many other land surfaces in the solar system. The phrase is now also used metaphorically by various researchers to describe any unexplored subject or field of research. For more history of the terms, see Terra Australis,
Another Planet / Voyager / "Voyager". Another Planet / Voyager "Another Planet" / "Voyager" is the second single by Australian drum and bass band Pendulum. It was released on 23 February 2004 by independent label Breakbeat Kaos, and was their first single to use the 12" picture disc format. The single peaked at number 46 in the UK Singles Chart, and reached number one in the UK Dance Chart. The song "Another Planet" contains samples from Jeff Wayne's musical version of "The War of the Worlds", and was included on the CD edition of "Hold Your Colour" when it was released in July 2005.