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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.



"There's an assumption we do have to make, which is that there's no changes in the material itself, and that all of the bumps we're seeing (in the gravity field) are from changes in the porosity and the amount of air between the rocks," Dr. Soderblom continued to explain in the September 10, 2015 MIT Press Release.



A Moon For Makemake. The observations of April 2015, that unveiled Makemake's tiny moon, were made with HST's Wide Field Camera 3. HST's ability to observe faint objects close to bright ones, along with its sharp resolution, enabled the astronomers to spot the moon that was being masked by Makemake's glare. The announcement of the dim little moon's existence was made on April 26, 2016 in a Minor Planet Electronic Circular.