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I have been reading an article "The Imbrium Impact" by Nils Aall Barricelli, an Italian-Norwegian mathematician, in the August 1971 issue of Analog magazine. He suggests that the Mare Imbriam was caused by the collision of the Moon with another, much smaller sattelite of the earth, with a diameter of about 300 to 350 kilometers. He states that surface features indicate that the smaller sattelite "collided with the Moon after approaching its surface from a low angle to the horizon". He further adds that a high velocity impact from a meteor or a small asteroid would have vaporized the surrounding rock, but an impact on the order of 2 to 3 km./sec would merely have melted the rock, causing a massive lava flow. I am certainly no expert on this, but I had never heard this theory before. I wondered if this theory had been disproved in the last thirty years, or never seriously considered.
Why is "American billion" in quotes? JD79 22:24, 13 March 2006 (UTC)
I had to delete this:
In fact, some of basaltic lava flows in this basin are as young as ~2.5 Ga. Someone should look up the correct ages. Lunokhod 18:28, 30 October 2006 (UTC)
In the TV series UFO (Anderson, 1969-1970) SHADO Moonbase military organization is located in the Mare Imbrium. Alessandro Crisafulli-- 147.163.48.49 ( talk) 16:22, 14 December 2009 (UTC)
In the paragraph on Apollo 15, I do not think it is necessary or appropriate to discuss the postage stamp incident or the Fallen Astronaut sculpture. They have little to do with Mare Imbrium, and a lot to do with the astronauts themselves. A reader can find out about those things in the Apollo 15 articles. What would be appropriate is a summary of the relevant findings of Apollo 15 with respect to Mare Imbrium. Jstuby ( talk) 19:14, 31 July 2017 (UTC)