is possible this sharing of the same orbit precisely because of the distance between the two planets 60 degrees, they are consistent with the so-called Lagrange points 4 and 5 (see the figure) and a stable path of the two celestial bodies allow the common center of mass (asterisk) around.
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In the proof of the actual existence of two planets on a common orbit, some astronomers now see a confirmation for that statement to the creation theory of the Moon, according to which Earth's satellite to have once emerged from the wreckage of a collision of the young Earth with the Mars-sized celestial bodies such as Theia.
According to astronomer Richard Gott and Edward Belbruno of the "Princeton University" must be this clash have gone relatively slowly from Amsterdam - an indication that Theia orbiting once in a similar distance and the Earth and on the same orbit the sun had reported "
NewScientist.com
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sources: international scientific aktuell.de / newscientist.com arxiv.org /
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