Portrait of Venus

Made using an ultraviolet filter in its imaging system, the photo has been color-enhanced to bring out Venus's cloudy atmosphere as the human eye would see it. Venus is perpetually blanketed by a thick veil of clouds high in carbon dioxide and its surface temperature approaches 900 degrees Fahrenheit.

Launched on November 3, 1973, atop an Atlas-Centaur rocket, Mariner 10 flew by Venus in 1974.