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Curious facts about cosmic life and their inhabitants.
The crust of Earth's Moon is 43 miles thick on the near-side hemisphere, and 93 miles on the far-side. It is composed of silicon, magnesium, oxygen, calcium, aluminum, and iron. There are also trace amounts of titanium, uranium, thorium, hydrogen, and potassium.
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Mars may be circled by many moons smaller than 160 to 330 feet in diameter, and a ring of dust has been predicted to circle Mars between Phobos and Deimos.
The first observations of Mars as an object traveling in Earth's night sky was recorded by the ancient Egyptian astronomers, and by 1534 BCE the ancient astronomers were familiar with the retrograde movement of the planet. By the time of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets, as well as systematic detections of their behavior. In the case of Mars, the ancient astronomers realized that it made 42 circuits of the zodiac every 79 years. These scientists of long ago even invented arithmetic methods so that they could make minor corrections pertaining to the predicted positions of the planets inhabiting our Solar System. The ancient astronomers referred to the planets as "wandering stars".
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The most popular theory of lunar formation suggests that the Moon was born in a monumental collision between a Mars-size object named Theia and the ancient Earth--and that this ancient smash-up would have melted our primordial planet. This model further suggests that more than 40 percent of Earth's Moon is composed of the debris of the tragedy that was Theia. However, more recent theories indicate that our planet suffered from several giant collisions during its formation, with the lunar-forming crash being the last great grand finale event.
"A late Moon-forming event, as suggested by our work, is very consistent with an identical Earth and Moon," Dr. Jacobson told Space.com.
"I think the best thing about this work is that they explain this link between the mass of the moon and the orbital distance, which was known before but not understood," said planetary scientist, Dr. David Nesvorny, in the November 29, 2012 Scientific American. Dr. Nesvorny, of the Southwest Research Institute in Boulder, Colorado, who did not contribute to the new research, added that "If you had asked me a few years ago, I would think of our Moon's formation and the formation of the satellites of the outer planets differently. This puts things on common ground."