Lunar Surface: Changes in 31 Months and Micrometeoroid Flux

Details Lunar Surface: Changes in 31 Months and Micrometeoroid Flux Lunar Surface: Changes in 31 Months and Micrometeoroid Flux

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...170.1092j&link_type=abstract

Science, Volume 170, Issue 3962, pp. 1092-1094

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Comparison of pictures of the lunar surface taken 31 months apart by Surveyor 3 and Apollo 12 show only one change in the areas disturbed by Surveyor: a 2-millimeter particle, in a footpad imprint, that may have fallen in from the rim or been kicked in by an approaching astronaut. Vertical walls 6 centimeters high did not collapse and dark ejecta remained dark. No meteorite craters as large as 1.5 millimeters in diameter were seen on a smooth soil surface 20 centimeters in diameter; this indicates a micrometeoroid flux lower than 4 × 10-7 micrometeoroids per square meter-second at an energy equivalent to about 3 × 10-8 gram at 20 kilometers per second. This flux is near the lower limit of previous determinations.

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