Giant impact hypothesis "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. Theia, an early protoplanet the size of Mars, hit Earth in such a way that it ejected a considerable amount of material away from Earth. Some proportion of this ejecta escaped into space, but the rest consolidated into a single body in orbit about Earth, creating the Moon.
Over time, other scientists have posited a variety of theories about what the moon is and where it came from. From mostly debunked hypotheses to the current prevailing theory, scientists have debated several scenarios, each of which might explain our moon, but none of which are without flaws.
Fission theory The fission theory suggests that, at one point, the Earth was spinning so fast that part of it spun off to form the moon. Fission theorists posit that the Pacific Ocean might be the site where the would-be moon material came off of Earth. However, after moon rocks were analyzed and introduced to the equation, they largely debunked this theory because the moon rock compositions differed from those in the Pacific Ocean.
In short, the Pacific Ocean is too young to be the source of the moon. Also, chemical components of both the Earth and the moon suggest they formed at around the same time.
Co-accretion theory This composite image shows the Earth, the moon and a black hole. The co-accretion theory posits that both the Earth and the moon formed together while orbiting a black hole. However, this theory neglects an explanation of why the moon orbits the Earth, nor does it explain the difference in densities between the moon and Earth.
The planetary object that impacted Earth has been dubbed "Theia" by scientists because in Greek mythology, Theia was the mother of the moon goddess Selene. When Theia hit Earth, a portion of the planet came off and eventually hardened into the moon.
Scientists have suggested that, among other alternatives, Theia could have been made of ice, or that Theia could have melted into Earth, leaving no separate trace of its own on the Earth or the moon; or Theia could have shared a close chemical composition to Earth.
Until we can determine how large Theia was, at what angle it hit the Earth and precisely what it was made of, the giant impact hypothesis will have to remain just that — a hypothesis. A possible refinement of the giant impact hypothesis was published in Nature Geoscience in The new study posits that multiple moon- to Mars-sized objects struck Earth, and the debris from these collisions formed disks around the Earth — think Saturn — before forming into moonlets.
These moonlets eventually drifted away from Earth and merged to create the moon we know today. If multiple objects collided with Earth, the chemical signatures between those objects and Earth would even out more as the moon formed than if it had just been a single impact event.
New lunar findings will inform the continued discussion of the origins of the moon. How old is the moon? Determining the age of the moon has proven to be a complicated endeavor. These dates would put the moon between 4. A team of researchers think they have accurately dated the moon at 4. The researchers used moon rocks taken from the lunar surface during the Apollo 14 mission in for their study.
Most moon rocks astronauts have brought back to Earth are composites of rocks fused together during meteor strikes, and that makes dating them tricky as the different pieces of the rocks will reflect different ages.
They isolated when these two elements has decayed to calculate how long the zicorn had formed and used that to provide what they contend is an accurate age for the moon. Speaking to The Verge about the findings, Richard Carlson, the director for the department of terrestrial magnetism at Carnegie Institution for Science, he praised the work but cited concerns about the zicorn approach.
Namely, Carlson questions the assumption that the decayed ratios for the uranium and lutetium would be the same in the early days of the solar system as they would be today.
This story was originally published September and has been updated with new information.Moon A New Theory for the Moon’s Origin A New Theory for the Moon’s Origin. by Dr. Danny R.
Faulkner on March 20, a scenario that hopefully kept the advantages of each of the three basic theories, while avoiding the shortcomings of each. Evolutionary scientists invoke a completely different scenario for the origin of the many. 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 alternate explanations, and research into .
4 theories about how the moon formed other scientists have posited a variety of theories about what the moon is and where it came from. and that makes dating them tricky as the different.
New theory explains how the moon got there "Every other body in the solar system has different chemistry," she said.
"Moon origin theories are concocted in computers, not by watching them. The Origin of the Moon and the Single-Impact Hypothesis I W. BENZ Theoretical Astrophysics Group, 7"-6 MS B, Los Alamos National Laboratory, classical theories of lunar origin had a few particular, on the single-impact hypothesis for its origin (Hartmann and Davis, ; Cameron and Ward, ).
This single-impact theory has the. The Origin of the Universe, Earth, and Life The term "evolution" usually refers to the biological evolution of living things. But the processes by which planets, stars, galaxies, and the universe form and change over time are also types of "evolution.".