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Interesting facts about space.

When Apollo 11 landed on the Moon in 1969, we were presented with our first human contact with the moon. The mission was able to accomplish the task of not only landing on the Moon, but also to return to the Earth with samples from the Moon. These samples along with subsequent presented us with answers regarding the composition of the Moon, which also gave us some basic facts that any theory about how the moon was created must answer/address. We learned:The Moon does not contain an iron core like our Earth does, due to the fact that the Moon's density is only 3.34 grams per cubic centimeter (compared to the Earth's which is 5.52 grams per cubic centimeter).Samples collected from the surface of the Moon reveal that it underwent extreme heat and baking, much more than what the Earth experienced.



and here is another

It is true that even our most powerful telescopes aimed at the landing sites wouldn't see anything. However, not because the Moon landings didn't happen. It is only because of the optical limitations of telescopes themselves, because of their limited size and distance from the Moon.



and finally

Moons are enchanting, mesmerizing objects dwelling in their orbits around planets both within and beyond our Solar System. Earth's own large Moon, a silver-golden world that shines in our starlit night sky with the reflected fires of our Star, the Sun, has long been the inspiration of haunting poems and tales of love, as well as myths of magic and madness. Most of the moons of our Sun's own bewitching family are glistening little icy worlds in orbit around the giant planets of the outer Solar System. In June 2013, astronomers announced their dedicated hunt for a habitable moon-world beyond our Sun's family, circling around the planet Kepler-22b, that dwells in the faraway family of a different star.

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In addition to the Giant Impact theory, there are several other models that have been proposed to explain how our Moon was born. One alternative model to the Giant Impact scenario suggests that Earth's Moon was once a part of our planet that simply budded off when our Solar System was in its infancy--approximately 4.5 billion years ago. According to this model, the Pacific Ocean basin would be the most likely cradle for lunar birth. A second model proposes that our Moon was really born elsewhere in our Solar System and, like the duo of tiny potato-shaped Martian moons, was eventually snared by the gravitational tug of a major planet. A third theory postulates that both Earth and Moon were born at about the same time from the same protoplanetary accretion disk, composed of gas and dust, from which our Sun's family of planets, moons, and smaller objects ultimately emerged.



The discovery that the hidden interior of Earth's Moon contains water raises some interesting questions concerning lunar formation. Most planetary scientists think that our Moon was born from the debris left behind after the catastrophic collision of our primordial planet with the tragedy that was Theia. This collision would have occurred very early in our Solar System's history. However, one of the reasons scientists had proposed that the lunar interior should be dry is that it is unlikely that the hydrogen necessary to create water could have survived following the ferocious heat of that ancient impact.



He added that "In our model for the Saturn system, we propose that Titan grew in a couple of giant impacts, each one combining the masses of the colliding bodies, while shedding a small family of middle-sized moons."