|MadSci Network: Astronomy|
I read recently that there was a probable 26 million year periodicity in meteor impacts on earth and that this possibly corresponded to extinctions. Jave crates on the moon been dated? In that case, has a periodicity there been observed? Craters on the moon may be less disturbed by plate techtonics, weather and life forms. Also, does the moon have a magnetic field and if it does, has there been any detection of this magnetic field's variation such as it has on earth, and was there any relationship between the variations on both planets?
Re: Moon crater survey and impact dating
Try the links in the MadSci Library for more information on Astronomy.