The astronomers then conducted an analysis called a Bouger correction in order to subtract the gravitational effect of topological features, such as valleys and mountains, from the total gravity field. What is then left is the gravity field hidden beneath the lunar surface, existing within its crust.
Earth's Moon Reveals An Ancient Secret. Many astronomers think that during an ancient era, termed the Late Heavy Bombardment, our young Moon was violently battered by a marauding multitude of invading asteroids that crashed onto its newly formed surface. This attack of pelting objects from space occurred about 4 billion years ago, and the shower of crashing asteroids excavated impact craters, and also slashed open deep fissures, in the lunar crust. This sustained shower of merciless impacts increased lunar porosity, and opened up an intertwining network of large seams under the Moon's surface.
I found that this was true with most fish species and the activity level of fish is largely due to what the weather and moon are doing at the time that you go fishing. In other words I discovered that I could use the weather and moon to my advantage when I was fishing. I began to think back to the times that I had experienced amazing days fishing. The kind of days where it seemed as if no matter what I did, I caught fish, and not only did I catch fish but those fish tended to be larger than "average". Have you ever experienced this kind of day while fishing?