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Curious facts about cosmic life and their inhabitants.

Our third theory to discuss is the "Co-Formation Theory" which alleges that the Moon and Earth were formed within the nebular disk around the Earth (similar to how our solar system formed around the Sun). This theory falls short when one revisits the composition of the Earth and Moon. If the Moon did indeed share some of the same building material as the Earth did and form in the same area, it should be very similar in composition to the Earth. We've seen, however, that the Moon doesn't share a significant iron core like our home planet does. There is one theory which remains to be discussed, and it is the one that is widely accepted today. The Giant Impactor Theory: The Giant Impactor Theory claims that the Moon was formed when an object the size of Mars slammed into the Earth shortly after the solar system's formation. After this object hit the Earth, tons of material from both the object and the Earth were sent into space and began to orbit around the Earth. This material slowly began to come together and collide until what we see as our Moon was created. This theory most easily explains the criteria we previously mentioned. The heat that would have been generated after the collision explains the evidence of "baking" on the Moon's surface. It also supports the fact that the Moon doesn't have a large iron core like the Earth. Finally, we have seen evidence of other such collisions in other parts of the solar system.



and here is another

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 finally

Dr. Li continued to note that "Other studies have suggested the presence of water ice in shadowed regions at the lunar poles, but the pyroclastic deposits are at locations that may be easier to access. Anything that helps save future lunar explorers from having to bring lots of water from home is a big step forward, and our results suggest a new alternative."

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The more recently obtained data concerning the Red Planet comes from seven active probes that either roam the Martian surface or orbit around the planet. The seven spacecraft include a quintet of orbiters and a duo of rovers. This collection includes 2001 Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, MAVEN, Mars Orbiter Mission, Opportunity, and Curiosity.



Two French astrophysicists, proposing the new, alternative scenario explaining moon-birth, reported their findings in a paper titled: Formation of Regular Satellites from Ancient Massive Rings in the Solar System, published in the November 30, 2012 issue of the journal Science. Dr. Aurelien Crida, an astrophysicist at the University of Nice--Sophia Antipolis and the Observatory of Cote d'Azur in France, explained in the November 29, 2012 issue of Scientific American that "It's fundamentally the same process that gave birth to the Moon and to the satellites of the giant planets, and that's the spreading of rings." Dr. Crida is a co-author of the study with Dr. Sebastien Charnoz of the University of Paris--Diderot.



In 2010 and 2011, the French astrophysicists devised their model to explain how the moons of Saturn were born. They based their findings on data derived from the Cassini probe--that is investigating the Saturn-system--and on numerical simulations. The team found that Saturn's bewitching rings, which are slender disks composed of tiny chunks of gleaming ice surrounding the giant planet, gave rise to the icy moons. This happened because the rings spread as time went by--and when the rings attained a critical distance from the planet (termed the Roche limit), their ends melded together and created small worldlets that broke off and floated away. In this way the rings created the icy moons orbiting Saturn.