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" ... In 1976, geologist Jack Hartung suggested that the 22 km (14 mile) wide crater, now called Giordano Bruno, marked the site of the impact the medieval monks witnessed. Fine-grained rock and dust radiate out from the crater in bright rays, stretching 150 km (93 miles) across the lunar surface and still mostly undisturbed by micrometeorite impacts. That means Giordano Bruno is probably the youngest of the Moon’s large craters, and Hartung suggested that it could be very young – about 842 years. ... "
" ... The gold-plated aluminum cover (L) of the Voyager golden record (R) both protects it from... [+] micrometeorite bombardment and also provides a key to playing it and deciphering Earth's location. ... "