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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

One of the findings they found out is that the lunar phases are consistently rotating. They go round and round without ending and every cycle is similar as the previous cycle. As there were no tools or technological devices to remind them of time, prehistoric populace only had the moon to be their guidance in life, besides the mighty Sun. The phase of the moon would indicate the time or month of the year, although it was not implied exactly in the form of months like how we are symbolizing the periodic months. But of course, the use of the moon did differ from one culture to another, one religion to the other.

and finally

Titan circles its giant parent-planet once every 15 days and 22 hours. Like Earth's own large Moon, and a number of other moons dancing around the quartet of giant gaseous planets of our Solar System's outer realm, its rotation period is identical to its orbital period. This means that Titan is tidally locked in synchronous rotation with Saturn--always showing only one face to its planet.

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However, this did not prove to be the case. Instead, Cassini's measurements did not suggest any great difference in temperature between the surrounding shore and the methane sea over this span of time. This finding indicates that the terrains surrounding the lakes and seas on Titan are wet with liquid hydrocarbons, which would cause them to warm up and cool down in much the same way as the methane sea itself.

The Giant-Impact Theory, alternatively termed the Theia Impact, or Big Splash Theory, proposes that Earth's Moon was born from the debris remaining from a catastrophic collision, that occurred about 4.3 billion years ago, between the primordial Earth and an unfortunate protoplanet, that was about the size of Mars. The Earth's Moon-forming collision would have occurred when our Solar System was still forming during the Hadean eon. The Hadean eon occurred about 20 to 100 million years after our Solar System emerged from its frigid, dark natal cloud of gas and dust. The doomed impacting protoplanet, often called Theia, received its name in honor of a Titan in Greek mythology who was the mother of Selene, the Moon goddess. An analysis of lunar rocks, published in 2016, indicates that this catastrophic crash was a direct hit--causing a thorough mixing of both Earth-stuff and Theia-stuff. The Giant-Impact Theory is the favored scientific explanation for the birth of Earth's Moon.

The efforts of planetary scientists to determine the lunar birthday have suggested a range of ages. Some have proposed an early event, about 30 million years after our Solar System formed, while others suggested that it occurred over 50 million years and perhaps as much as 100 million years after our Sun's family took shape.