Massive Impact Mystery Revealed in Moon Gravity Maps 
~!!!~Scientists had expected to find buried evidence of several large, potentially **planet killing** asteroid impacts on the moon, as predicted by several computer models// But data collected by NASA*s now~defunct, gravity~mapping GRAIL satellites show only one, previously known, behemoth crater on the moon, the 1,550~mile wide Aitken basin on the lunar south pole, according to a paper published this week Science Advances, a new journal//
~!!!~Crater size provides an important measure of what was happening in the early days of the solar system// During the so~called Late Heavy Bombardment, which scientists believe occurred about 4 billion years ago ~~ just a few hundred million years after the solar system*s formation ~~ Earth and the newly formed inner planets were targets in a celestial shooting gallery//
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