The earth and the moon were not “the twins”


Common theory is that the moon is the result of a catastrophic collision of earth with a Mars-wide proto-planet. However, this scenario seems to fit so far Found, which was that of the moon, and the earth is a geochemically almost identical, from the proto-planet, it’s still missing almost. Now, researchers might have at least solved part of the puzzle. Because of the re-analysis of Apollo moon samples from varied Terrain shows significant differences in the isotopes of oxygen. Thus, in the ancient lunar crustal rocks, and some of the basalts are, in fact, it’s not like the earth in perspective, but that’s true of the rocks in the deep lunar layers. This throws a new light on the crash, and the fate of the proto-earth.

The moon owes its existence to the disaster “cosmic” Before, which is approximately 4.5 billion years ago the earth collided with a Mars-wide proto-planet. When it hits the impactor “Theia was destroyed, completely, the debris accumulated together with minor proportions of the earth’s crust, and the mantle of rock in orbit around the earth. Based on these, the moon would have to exist for nearly three-quarters of the material in regions of the former proto-planet was first formed, then. As for the common scenario. But there is one problem: the moon and the earth are very similar. The moon is not, in fact, arose out of the ruins of a proto-planet, it would have the signature isotope in the rocks of the earth and the moon are different. Each and every celestial body in the solar system is the asteroid that has its own, typical of the signature of the isotope, after all.

The mystery of the isotope values of the

However, when the new moon and its predecessor, the, Theia, this does not seem to be the case, for The compositions of isotopic elements, including, silicon, chromium, tungsten, titanium, and, in the case of the earth and the moon are almost identical to the isotope pattern of the water molecules in the terrestrial and lunar origin, they are all the same. The similar is true for the ratio of the isotope oxygen-17 In: “analysis of a lunar basalt samples have mean values that are virtually indistinguishable from those of the earth,” said Tyler Cano, the University of New Mexico and his colleagues. Some of the planetary scientists suggest, therefore, that Theia might have been a product of the chemical section of the earth, the proto-planet must have originated in the same Orbit, and their distance from the Sun, such as on the early earth. Alternatively, I would also like this feature, there will be the earth and Theia at the time of the collision, it is almost completely evaporated, so that the debris, which is then almost comparable to the mix, it could. Both of these scenarios, however, it is only to a limited extent, in the models that are simulated.

So, now the Barrel and your Team are on the hunt for a simpler explanation: it May be that the amounts of the isotopes depend on the nature of the moon samples than was previously assumed. So that you can subject rock samples from the different soil of the moon right now, for a re-think in terms of the ratio of the isotope of oxygen, 17 O in The samples that are included with the various types of Rocks from Mare regions of the lunar highlands, and volcanic glass. For the purposes of this comparison, the researchers determined, in addition to the 17 O values that are different from mantle-derived rocks.

Theia came from even further away?

The analysis revealed that: Take the average of all the studied moon rock samples, and the isotope values of oxygen and, in fact, is almost exactly the size of the earth. “But it’s very clear that the lunar samples are almost three times higher variability of the 17 O values of the underground,” the report from the Muzzle, and his / her Team. Thus, the previous assumption that stone and the moon have the same oxygen-isotope values, therefore, it is not correct in Detail, there is a significant deviation. Specifically, the researchers found that the titanium-rich Martian basalts and highland rocks are significantly lower than 17 The action of the green volcanic glass. How can I explain, originates in the volcanic glass sources in which there were more than 400 miles deep into the ocean of magma on the young moon. “We will assume, therefore, that the high-17-The share of this eyewear, they are representative of the fusion of Rock, to the depth of the mantle of the moon is derived from it,” says Cano, and his colleagues.

But what do these results mean for the collision scenario, and the nature of the proto-planet Theia? According to the scientists, this suggests that the proto-planet was a bit of a different composition from that of the earth, and that all the relics are preserved to this celestial body in the Interior of the moon. “The isotopes of oxygen in the earth system, with the increase of the distance from the sun to the top – -17–they tend to be the sonny & cher celestial body inside the solar values, and then, then, Theia may be more developed than that of the earth,” according to the researchers. After the collision, the wreckage of this proto-planets accumulated, especially in the Interior of the newly-formed moon. Therefore, in the rocks and in the background the moon’s mantle contain a higher ratio of the oxygen isotopes 17 O Theias isotopic composition was not homogenized in the collision altogether,” said the butt, and your fellow students. The rocks of the crust of the moon, mixed in with the remains of the slowly condensing Silikatdampfs. This is the remaining vapour contained in the lower 17 O-values and have been found only in the outer layers of the solidifying of the molten moon and ocean. This explains why, according to the researchers, that the crust of the moon rocks that are about 17-to The content, such as in the lunar mantle.

Source: Erick Cano, University of New Mexico, Albuquerque), et al. Nature Geoscience, doi: 10.1038/s41561-020-0550-0