Boot prints on the Moon

Boot prints on the Moon

Fig. 5.18 . On 20 July 1969, Neil Armstrong (1930- ) became the first human to walk on the Moon. His boot print, shown here, reveals a thin layer of Moon dust, about 0.01 meters thick. Because there is no atmosphere or weather on the Moon, the footprint will probably remain for 1 or 2 million years. By that time, the constant rain of micrometeorites will have erased it. Altogether, twelve astronauts have left boot prints on the Moon. (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University