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Interesting facts about space.
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".
and here is another
The research published in the July 4, 2016 issue of Nature Geoscience highlights the main factor differentiating moon-birth around Mars and Earth: the differing rotation speeds of the two planets prompted "completely different tidal actions," Dr. Charnoz explained in the July 4, 2016 CNRS Press Release. Dr. Charnoz proposes that at the time of their respective impacts, "Earth took less than four hours to spin on its axis whereas Mars rotated very slowly over a 24-hour period." The result of this important difference caused Earth to hold on to its single, large Moon, while the Martian collision created a dozen smaller moons alongside a larger moon. As time went by, Martian tidal action--resulting from the planet's slow rotation rate--caused most of the moons, including the largest one, to crash back down to the surface of their parent-planet. As a result, only the two most distant moons, Phobos and Deimos, survived as testimony to the ancient catastrophe.
If this ancient catastrophic impact really did occur, there should be deposits of these tragic moons on the Martian surface. The Japanese Aerospace Exploration Agency (JAXA) is currently planning a sample return mission to Phobos and Deimos, the Martian Moons Explorer, and NASA has plans to eventually return samples to Earth from the surface of Mars-- perhaps as soon as the 2020s. At the conclusion of their paper, the authors note, "Our scenario provides further motivation for a sample return mission to the Martian satellites."
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"This means that at the atomic level, the Earth and the Moon are identical. This new information challenged the giant impact theory for lunar formation," study lead author Dr. Seth Jacobson told Space.com on April 2, 2014. Dr. Jacobson is a planetary scientist at the Cote d'Azur Observatory in Nice, France.
Most planetary scientists think that Earth's Moon was born near the end of Earth's formation, Dr. Jacobson said in the April 2, 2014 National Geographic News. This is the time that Theia is thought to have blasted into our planet and shot off portions of both traumatized bodies into the sky.
According to the new theory, moon-formation starts at the very edge of a planetary ring, where a fragile baby moon can begin to emerge without the danger of being ripped apart by the fierce gravity of its parent planet. These dancing little moonlets, formed from ring-material, then travel outward. As the ring-system continually produces moonlet after moonlet after moonlet, the small icy worlds coalesce to form increasingly larger moons. The larger moons, in turn, may also merge together, as they dance outward from their parent planet.