摘要：An error occurred during the production process. The exponent of N should be “1/2”, not “1?2” in page 3, at the 24th line of the left column (± ρ/N 1/2 ), and at the 27th line of the right column (±NcN 1/2 ).
关键词：Moon;planets and satellites: surfaces;planets and satellites: physical evolution;errata;addenda
