Launched as GRAIL A and GRAIL B in September 2011, the probes were renamed Ebb and Flow by schoolchildren in Montana. The probes operated in almost circular orbit near the lunar poles at an altitude of approximately 34 miles, until their mission came to an end in December 2012. The distance between the twin probes altered a bit as they soared over areas of lesser and greater gravity that were caused by visible topological features on the Moon's surface, such as impact craters and mountains--as well as by masses that were secreted beneath the lunar surface.
"For the smallest craters that we're looking at, we think we're starting to see where the Moon has gone through so much fracturing that it gets to a point where the porosity of the crust just stays at some constant level. You can keep impacting it and you'll hit regions where you'll increase porosity here and decrease it there, but on average it stays constant," Dr. Soderblom continued to explain to the press on September 10, 2015.
Soul Mates and the Moon. When we think about finding a soul mate, we think of someone who "gets us" on a profound emotional level-someone with whom we can share our darkest secrets, our hopes and dreams. Like a mother goddess, our soul mate accepts us unconditionally. He or she nurtures and loves us no matter what happens. In other words, when we dream of finding a soul mate, we are tuning in to the energy of the Moon!