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Learn more about Bing search results hereMassive collisionOrganizing and summarizing search results for youEarth's Moon originally formed from a massive collision. A Mars-sized protoplanet hit Earth around 4.5 billion years ago, launching molten debris into orbit that fused to become our Moon. The prevailing theory is the giant impact hypothesis, which suggests that the Moon formed when an object smashed into early Earth. The early lunar surface existed in a molten state, forming the Moon's present-day anorthosite crust.
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Origin of the Moon - Wikipedia
The origin of the Moon is usually explained by a Mars-sized body striking the Earth, creating 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 … See more
Although the giant-impact hypothesis explains many aspects of the Earth–Moon system, there are still a few unresolved problems, such as the … See more
Capture
This hypothesis states that the Moon was captured by the Earth. This model was popular until the 1980s, and some points in its favor are the Moon's size, orbit, and tidal locking.
One problem is … See more2011
In 2011, it was theorized that a second moon existed 4.5 billion years ago, and later had an impact with the Moon, as a part of the accretion process in the formation of the Moon.
2013 See more• Claimed moons of Earth – Claims that Earth may have other natural satellites
• Far side of the Moon – Hemisphere of the Moon that always faces away from Earth
• Geology of the Moon – Structure and composition of the Moon See more• Lunar formation Case Western Reserve University
• The Once and Future Moon (September 28, 2012) Archived January 7, 2013, at the Wayback Machine
• Nature - Moon-forming impact theory rescued See moreWikipedia text under CC-BY-SA license Moon Formation - NASA Science
Feb 14, 2025 · Earth’s Moon is thought to have formed in a tremendous collision. A massive object ― named Theia after the mythological Greek Titan who was the mother of Selene, …
How the Earth and moon formed, explained - University of …
The Earth and moon formed about 4.6 billion years ago from a giant impact between the proto-Earth and another Mars-sized object. Learn how scientists use …
Where Did Our Moon Come From? We Asked a …
Dec 13, 2022 · Earlier versions of lunar formation theories included capture, where the Moon would have been a strayed planetoid. Another version was fission, where the Earth was spinning so fast that it would have blorped out of …
The origin of the Moon: 5 theories to explain the formation of …
Where did the Moon come from? - NASA
The Moon formed from a giant impact of a Mars-sized body with Earth about 4.45 billion years ago. This theory explains the Moon's low density, composition, and extra heating, and is …
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What was the Moon called before it crashed into Earth?
6 hours ago · The direct answer is: The Moon, as we know it, didn’t exist before the hypothesised collision between Earth and Theia. The Moon we see today is believed to have formed from …
How did the Moon form? - Natural History Museum
Museum planetary science researcher Prof Sara Russell explains the origins of Earth's closest companion. Analysis of samples brought back from the NASA Apollo missions suggest that …
Moon - Formation, Craters, Orbit | Britannica
1 day ago · Lunar origin theories can be divided into three main categories: coaccretion, fission, and capture. Coaccretion suggests that the Moon and Earth were formed together from …
Impact that formed the Moon struck a practically newborn Earth
Mar 14, 2025 · The Moon formed from that debris. Determining exactly when is not an esoteric exercise—it’s critical to understanding the history of Earth, says Mélanie Barboni, a …
How Did the Moon Form? - Astronomy.com
Jul 1, 2019 · Evidence suggests the Moon formed when a giant object collided with the proto-Earth several billion years ago, liberating material that then coalesced into the Moon. The …
The origin of the Moon - PMC
It would tell us if the Earth and Moon are unusual in being so similar isotopically. The main meetings around the origin of the Moon have been held in 1984 (Hawaii), 1998 (Monterey) and …
How did Earth get such a strange moon? Exploring the giant …
5 days ago · The moon is unlike anything else in the solar system. So how did our planet end up with such a special moon?
The Moon Might Have Formed a Little Later than Originally Believed
Jul 18, 2020 · A new study indicates that the Moon is actually younger than we thought, and wasn't finished forming until the Earth's core was finished too.
Origin of Earth’s Moon - Let's Talk Science
Learn how scientists think the Moon formed from a giant impact between Earth and Theia, and what we have learned from Moon rocks. Explore different scenarios and evidence for the Giant …
Teach Astronomy - Origin of the Moon
Lighter debris from Earth's mantle and the impactor's mantle mixed together and were ejected into a swarm of material around the Earth, where it formed a ring of material that eventually …
What did Earth look like 4.5 billion years ago?
3 days ago · The Moon’s Formation The formation of the moon played a significant role in shaping early Earth. The most widely accepted theory suggests that a Mars-sized object called Theia …
Where Did the Moon Come From? | Britannica
We still aren’t sure where the Moon came from. Did the Earth capture it in its orbit? Was it created at the same time as Earth? Read on to find out some of the best theories about the Moon’s …
Where Does the Moon Come From? - HISTORY
Mar 27, 2012 · Known as the giant impact hypothesis, the reigning lunar origin theory holds that the moon formed when Earth collided with a planet half its size—roughly as big as …
Composition and origins of the Moon - Institute of Physics
There are three main ways that moons are thought to form. Scientists have found that some planets sucked wandering planetesimals into orbit as they were passing close by. Phobos and …
Did Earth Create the Moon? Research Uncovers Clues About …
Jan 20, 2025 · Researchers from the University of Göttingen and the Max Planck Institute for Solar System Research (MPS) conducted analyses on lunar and terrestrial samples, revealing …
How Did the Moon Really Form? - Science | AAAS
Jun 5, 2014 · Early in its history, Earth was struck a glancing blow by a Mars-sized planet. That planet was destroyed by the impact, but much of its debris—and some of Earth's—formed into …
Where did the Moon come from? - University of Oxford
Aug 14, 2014 · All of this led to a model of a Moon origin through a massive late collision (the 'Giant Impact') between two already formed planets – the proto Earth when it was perhaps …
9.4 The Origin of the Moon – Astronomy
The fission theory—the Moon was once part of Earth, but somehow separated from it early in their history. The sister theory—the Moon formed together with (but independent of) Earth, as we …
When was Earth formed? - The Environmental Literacy Council
6 hours ago · The formation of the moon stabilized Earth’s axial tilt, leading to more stable seasons and a more habitable planet. The impact likely removed much of the Earth’s crust, …
What’s the Definition of a ‘Moon’? | Scientific American
19 hours ago · Here’s a simple question: What’s a moon? As with so many questions in science, it may seem straightforward but truly isn’t. “Why, a moon is a celestial body that orbits a planet,” …
China's Chang'e-6 Samples Reveal Lunar Mystery: 4.25-billion …
1 day ago · Scientists have long sought to determine the age of the Moon's South Pole–Aitken (SPA) basin, the largest and oldest known impact crater on the lunar surface. Recently, a …
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