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.
I'm not anti-science, in fact I think our world has only improved because of it. But science should be no less immune from a serious reality check than was the church in the dark ages. I believe in the bible , and I'm sure it gives us only a very short time to the second coming of Christ. But even at that I would never put the bible against science. I am satisfied that science is the book of how, and the bible is the book of why.
NASA's future exploration of ocean worlds is enhanced by HST's monitoring of Europa's possible plume activity and Cassini's long-term observations of the plume of Enceladus. In particular, the investigations of both ocean worlds are providing the groundwork for NASA's Europa Clipper mission, which is planned for launch in the 2020s.