The chemistry of Moon rocks would be different from that of Earth rocks.
“The big question was always, why do we not see this difference, why are Earth and the Moon so similar?
“It changes the nature of the debate,” says Robin Canup, a planetary scientist at the Southwest Research Institute in Boulder, Colorado, who was not involved in the study.
” says Daniel Herwartz, an isotope geochemist at the University of Cologne in Germany and a member of the study team.
The giant impact “is a nice theory that explains a lot of things, but there was this problem”.
Finding a difference Herwartz and his colleagues decided to examine oxygen isotopes because planets and moons have a distinct oxygen fingerprint that records the exact environmental conditions in which they were born. Earlier studies found that the proportions of the different oxygen isotopes in Earth and the Moon — as averaged over their entire bulk — were essentially identical.
For the new study, the researchers used an extremely precise laser-based method to measure oxygen isotopes in a range of Earth rocks, meteorites and three lunar samples gathered by the Apollo astronauts.
Here's a look at the real chemical composition of the Moon.
Answer: The Moon is similar to the Earth in that it has a crust, mantle, and core.Based on what we know about how planets and moons form, the core of the Moon is believed to be at least partly molten and probably consists primarily of iron, with some sulfur and nickel.The core likely is small, accounting for just 1-2 percent of the Moon's mass. This is the layer between the crust (the part we see) and the inner core.Both are types of igneous rocks, which formed from cooling lava.Although it is very thin, the Moon does have an atmosphere.He suggests that the body that triggered the Moon-forming impact, which some scientists call Theia, may have been chemically similar to a class of meteorites called enstatite chondrites.