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Curious facts about cosmic life and their inhabitants.
Our Moon makes a complete orbit around Earth in 27 Earth days and it rotates (spins) at that same rate--meaning, in that same amount of time. Because our planet is also moving--rotating on its axis as it circles our Star--from our viewpoint, our lunar companion appears to circle us ever 29 days.
and here is another
"A major difficulty has been to explain why a giant impact on Mars would have left two moons so different from our own Moon, a huge single mass, that also formed from Earth undergoing such an impact," explained Dr. Sebastien Charnoz in a July 4, 2016 Centre National de la Recherche Scientifique (CNRS) Press Release. Dr. Charnoz is a planetary scientist at the Institut de Physique Du Globe De Paris (IPG) who contributed to the new research.
The vanished, ill-fated, large moon could have been a few hundred kilometers in diameter. The large moon would also have allowed a handful of other smaller moons to form--including the duo of small, shapeless ones that survive today. However, this large inner moon would have been born close to or within the Roche limit. This is why it is likely that it crashed into Mars as a result of tidal forces within several million years--and the collection of other small moons followed their leader. Only Phobos and Deimos kept their distance.
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"What people frequently forget in this field is that you never have just one big impact. We have to worry about how big the next biggest impact was," and whether that impact blurred the effects of the previous giant impact, he continued to explain.
Such moon-forming mergers and collisions are not unheard of. For example, the leading theory explaining the formation of Earth's own large Moon, suggests that it was born about 4.5 billion years ago when a Mars-sized protoplanet, dubbed Theia by astronomers, collided with our planet. Just as our Moon is identical geologically to Earth's mantle, the six medium-sized icy sister moons of Saturn are all similar in composition to Titan's icy mantle, the researchers announced in October 2012.
The moon-mergers may have happened very long ago--or maybe quite recently. The mergers could have been tripped off by gravitational disruption caused by a migrating giant planet such as Uranus or Neptune, the researchers told the press in October 2012.