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The Rupes Nigra ("Black Rock"), a phantom island, was believed to be a black rock located at the Magnetic North Pole or at the geographic North Pole itself. Described by Gerardus Mercator as 33 French miles in size, it provided a supposed explanation for why all compasses point to this location.
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The first group to reach the north magnetic pole was led by James Clark Ross, who found it at Cape Adelaide on the Boothia Peninsula on 1 June 1831, while serving on the second arctic expedition of his uncle, Sir John Ross. Roald Amundsen found the north magnetic pole in a slightly
Rome might not have built ancient history’s biggest empire – a shout out to Genghis for that one – but it was undoubtedly the most enduring and influential.
Rupes / ˈ r uː p ɪ s / (plural / ˈ r uː p iː z /) [1] is the Latin word for 'cliff'. It is used in planetary geology to refer to escarpments on other worlds. As of January 2013, the IAU has named 62 such features in the Solar System, on Mercury (17), Venus (7), the Moon (8), Mars (23), the asteroids Vesta (2) and Lutetia (2), and Uranus's satellites Miranda (2) and Titania (1).
Discovery Rupes is an escarpment on Mercury, approximately 267 kilometers (166 mi) long, located at latitude 58.52 N and longitude 53.25 W. [1] It was formed by a thrust fault, thought to have occurred due to the shrinkage of the planet's core as it cooled over time. The scarp cuts through Duccio crater.
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Dermatosis papulosa nigra, a condition of many small, benign skin lesions on that face that closely simulate seborrheic keratoses, a condition generally presenting on dark-skinned individuals; Linea nigra, a dark vertical line that appears on the abdomen during pregnancy; Substantia nigra, a portion of the brain associated with dopamine production