Express doubts that two celestial bodies could have form from the same substance, but one of them, the Earth, has an iron core, and the other, the Moon, is practically absent [ 15 ] . So, when samples of lunar soil were deliver to Earth and its composition became known, the coaccretion hypothesis was reject [ 16 ]. 4. Capture theory The final theory of the “Big Three” is the hypothesis of the capture of the already form Moon by the Earth. Thomas See (Thomas Jefferson Jackson See) in 1909 [ 17 ]. According to this hypothesis, a celestial body flew past the Earth, which the Earth pull into its orbit by gravitational forces.
It was first voic by the American astronomer
The moon in this version is not a fragment of the Earth Belarus Phone Number List or a “sister”, but a “guest” who happen to be near the Earth. This theory can be confirm by the fact that the planet Mars, probably in this way, acquir its satellites – Deimos and Phobos. They can be “alien” asteroids, just like the Moon [ 18 ]. However, this theory also has weaknesses: celestial bodies-“aliens” often have a bizarre shape, and not spherical, like the Moon. And their trajectories are far from the circular orbit in which the Moon is currently moving. 5. The emergence of the moon from small satellites.
To the Earth could eventually form
The hypothesis known in English as the “Many-moons BT Lists Theory” was describ by the American geophysicist Gordon JF MacDonald in 1966. It is similar to the capture theory – with the only difference that it was easier for the Earth to “capture” several smaller celestial bodies than one large one. According to Macdonald, several celestial bodies attract one large Moon [ 20 ]. This theory does not explains so similar. In addition, it is not clear why several moons could form one large one exactly near the Earth, but nothing like this happen with Mars and its two small satellites.