Although the giant-impact hypothesis explains many aspects of the Earth-Moon system, there are still a few unresolved problems, such as the Moon's volatile elements not being as depleted as expected from such an energetic impact. (wikipedia.org)
It was an energetic collision that formed the Earth-Moon system and, at the same time, wiped out all potential life on Earth. (deportesenlaboulaye.com)
Rocky planets1
In parts of the Earth, the temperature would have risen to 10,000 °C (18,000 °F). The Moon's relatively small iron core (compared to other rocky planets and moons in the Solar System) is explained by Theia's core mostly merging into that of Earth. (wikipedia.org)
Bodies3
Other proposed scenarios include captured body, fission, formed together (condensation theory, synestia), planetesimal collisions (formed from asteroid-like bodies), and collision theories. (wikipedia.org)
The newly formed Moon orbited at about one-tenth the distance that it does today, and spiraled outward because of tidal friction transferring angular momentum from the rotations of both bodies to the Moon's orbital motion. (wikipedia.org)
Mars was created 4.6 billion years ago but its rocks have been blasted to all the other bodies, even the Moon. (cycliccatastrophism.org)
Mass3
Also, the Moon's titanium isotope ratio (50Ti/47Ti) appears so close to the Earth's (within 4 parts per million) that little if any of the colliding body's mass could likely have been part of the Moon. (wikipedia.org)
The hypothesis requires a collision between a proto-Earth about 90% of the diameter of present Earth, and another body the diameter of Mars (half of the terrestrial diameter and a tenth of its mass). (wikipedia.org)
The asymmetrical shape of the Earth following the collision then causes this material to settle into an orbit around the main mass. (wikipedia.org)
Selene2
The latter has sometimes been referred to as Theia, the name of the mother of Selene, the Moon goddess in Greek mythology. (wikipedia.org)
Its name originates with the Greek word selene , meaning "moon. (isoflex.com)
Single3
The origin of the Moon is usually explained by a Mars-sized body striking the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be formed. (wikipedia.org)
Some proportion of these ejecta escaped into space, but the rest consolidated into a single spherical body in orbit about Earth, creating the Moon. (wikipedia.org)
The researchers measured the variability of a single chromium isotope (54Cr) in meteorites. (deportesenlaboulaye.com)
Include1
Other additives used in crown glasses include zinc oxide, phosphorus pentoxide, barium oxide, fluorite and lanthanum oxide. (mathisfunforum.com)
Rocks1
In 2001, the most precise measurement yet of the isotopic signatures of Moon rocks was published. (wikipedia.org)
System1
NASA Some theories have been stated that presume the proto-Earth had no large moons early in the formation of the Solar System, 4.425 billion years ago, Earth being basically rock and lava. (wikipedia.org)
Chemical1
One of the challenges to the longstanding theory of the collision, is that a Mars-sized impacting body, whose composition likely would have differed substantially from that of Earth, likely would have left Earth and the moon with different chemical compositions, which they are not. (wikipedia.org)
Geology1
The geology of the Moon has since been more independent of the Earth. (wikipedia.org)
Orbit5
Some proportion of these ejecta escaped into space, but the rest consolidated into a single spherical body in orbit about Earth, creating the Moon. (wikipedia.org)
Such an impact would have put enough material into orbit around Earth to have eventually accumulated to form the Moon. (wikipedia.org)
The asymmetrical shape of the Earth following the collision then causes this material to settle into an orbit around the main mass. (wikipedia.org)
The energy liberated during the reaccretion of material in orbit around Earth would have been sufficient to melt a large portion of the Moon, leading to the generation of a magma ocean. (wikipedia.org)
Of course, if collisions fall on the moon, and it was anywhere near the earth or moving in an orbit about the sun, of about the same magnitude as the orbit of the earth, one would expect that collisions would also cover the earth in great density. (lindau-nobel.org)
Earth-Moon2
Although the giant-impact hypothesis explains many aspects of the Earth-Moon system, there are still a few unresolved problems, such as the Moon's volatile elements not being as depleted as expected from such an energetic impact. (wikipedia.org)
This is the conclusion to which I came some years ago and it seemed reasonable to assume that the collisional history had occurred very early in history and possibly at the terminal stage, the formation of the earth moon system, whatever that may have been. (lindau-nobel.org)
Evidence2
A 2012 study on the depletion of zinc isotopes on the Moon found evidence for volatile depletion consistent with the giant-impact origin for Earth and the Moon. (wikipedia.org)
I have been working with Gordon MacDonald on a review of the evidence in regard to the structure and history of the moon for the past two years. (lindau-nobel.org)
Impact2
The origin of the Moon is usually explained by a Mars-sized body striking the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be formed. (wikipedia.org)
The standard giant-impact hypothesis suggests that a Mars-sized body, called Theia, impacted the proto-Earth, creating a large debris ring around Earth, which then accreted to form the Moon. (wikipedia.org)
Early2
NASA Some theories have been stated that presume the proto-Earth had no large moons early in the formation of the Solar System, 4.425 billion years ago, Earth being basically rock and lava. (wikipedia.org)
And hence this collisional process must have occurred early in the history of the moon. (lindau-nobel.org)
Effects1
365. Statement I: Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun, and the rotation of the Earth. (dsguruji.com)
Small2
In parts of the Earth, the temperature would have risen to 10,000 °C (18,000 °F). The Moon's relatively small iron core (compared to other rocky planets and moons in the Solar System) is explained by Theia's core mostly merging into that of Earth. (wikipedia.org)
Also, the Moon would have collided with and incorporated any small preexisting satellites of Earth, which would have shared the Earth's composition, including isotopic abundances. (wikipedia.org)
Formation1
A very fine powdery dust with rocks that must have been melted after the formation of the moon. (lindau-nobel.org)
Side3
Along the way, the Moon's rotation became tidally locked to Earth, so that one side of the Moon continually faces toward Earth. (wikipedia.org)
These collisions have covered the surface of the moon on the far side almost completely with the results of the collisions. (lindau-nobel.org)
And on this side, including the maria to a certain extent, the whole surface again has been fashioned largely by collisions. (lindau-nobel.org)