Re: samples from Apollo 12
Raoul wrote; We know now that crater Tycho was formed 109 Million years ago.
And Tycho is problably the most recent large impact crater on the Moon. It feels strange that astronauts walking on a plain, on Oceanus Procellarum, could find evidence of an event occuring so far away.
Yes, good point. Tyco's young crater is 56 miles in diameter and 14,000 feet deep with a 5,000 foot center peak. Some other small craters like Stevinus A (5 miles wide) have a ray system 650 miles long and Aristarchus only 25 miles wide but 12,000 feet deep is considered extremely young. Most of the other craters with ray systems are less that half the size of Tyco.
Thanks for the sample note,
SteveS