This perspective view of Venus, generated by computer from Magellan data and color-coded with emissivity, shows the impact crater Markham, named after the English aviator Beryl Markham (the crater was briefly known unofficially as Franklin; the earlier name was not approved by the Nomenclature Committee of the International Astronomical Union). Markham, with a diameter of 71 km, is one of more than 400 Venusian craters whose formation triggered the outflow of highly fluid materials. .