| Scientists
speculate that early in
lunar history, when large impactors struck the Moon’s surface, causing millions of cubic kilometers of crustal
debris to be ejected, denser
material
from the Moon’s mantle rose
up beneath the impactors almost
immediately, compensating for
the ejected material and thus leaving
no low gravity anomaly in the
resulting basin.
這句話在解釋會何沒有第九行說的那個現象
這裡要注意這個"early"
然後在第32行
Thus
today such
gravitational compensation probably
would not occur:
所以在"today"不會有"compensatiion"
因此如果會有negative gravity anomalies
就是發生在現在了 | 
