A Piece of Armagh on the Moon: Image of the Month

Once, about four billion years ago, an asteroid about a kilometre and a half across fell on our Moon.It fell unwitnessed by the brooding, lifeless Earth which loomed large in the ancient lunar sky, ˆàsmashing into our satelliteòÀÙs central highlands on the nearside.It excavated a crater about 33 km across in the already rugged terrain.

 

A recent image of Lindsay Crater assembled from Lunar Recconnaissance Orbiter imagery.On Earth any of those tiny craters in the main crater's floor would be major tourist attractions.(Image credit:NASA/LRO)

 

 

Time passed, and over the aeons the crater gradually changed.

The slow erosion of meteroids and occasional blankets of ejecta blasted from new craters gradually softened its outlines, while smaller arrivals from deep space poked new craters in its floor.

Time passed, intelligent life arose on Earth and gave the crater a name, Dollond-C.Then ˆàin 1972 Apollo 16 landed about 100km to the crateròÀÙs southeastˆà but that is as close as life as ever come to it. In 1978, the crater got a new name, becoming Lindsay Crater in honour of Eric M. Lindsay (1907-74).

Lindsay, a long-serving director of Armagh Observatory, was of course the man who inspired Armagh Planetarium, so this crater is a very special piece of the Solar System to us all here.

 

(Article by Colin Johnston, Science Communicator)