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The Truth About Moons Orbiting Earth

Mô phỏng tiểu Mặt trăng 2020 CD3 ở trên quỹ đạo Trái đất 3 năm trước khi rời đi.

After centuries of exploration, researchers have discovered that the Earth has 0 to several Moons depending on the period..

Earth appears to have only one Moon. For millennia, we have known no other natural satellites. But over centuries of astronomy and space exploration, researchers have discovered hundreds of moons in the solar system and Many moons revolve around the Earth, Live Science reported March 20.

Simulation of the mini-Moon 2020 CD3 remaining in Earth orbit for 3 years before leaving.
Simulation of the mini-Moon 2020 CD3 remaining in Earth orbit for 3 years before leaving.

Simulation of the mini-Moon 2020 CD3 remaining in Earth orbit for 3 years before leaving. (Photo: Stéphane Masclaux).

The Moon is a solid satellite in permanent orbit around Earth, according to Gábor Horváth, an astronomer at Ðtvös Loránd University in Hungary. But it’s not the only object sucked into Earth’s orbit. A series of near-Earth objects and dust clouds are also influenced by Earth’s gravity. In theory, these temporary satellites can be considered mini-Moons, semi-satellites or ghost Moons.

SO, The question of how many moons Earth has is more complicated than you think. The number of Moons changes over time from 0 to several Moons. At first, about 4.5 billion years ago, Earth had no Moon. Then, 4.4 billion years ago, a Mars-sized asteroid called Theia crashed into Earth. Large fragments of the Earth’s crust were thrown into space. They came together in just a few hours, forming the Moon, according to a study published in 2022 in the journal Letters from the astrophysical journal.

Other moons measuring up to a few meters are often temporary, being pulled by Earth’s gravity for a short time before escaping into space. In 2006, asteroid 2006 RH120 6 m wide remained for 18 months and was the first asteroid observed orbiting Earth in a long time. CD3 2020, a 3.5 m wide meteorite, left Earth’s orbit in March 2020 after spending 3 years functioning as the planet’s second mini-Moon. In 2020, scientists also discovered SO 2020. This mini-Moon drifted into space in early 2021. They realized, however, that SO 2020 was not a natural Moon but the remains of a layer of rocket boosters from the 1960s.

In addition to the Moons entering and leaving Earth’s orbit, there are many cosmic objects that NASA calls semi-satellite as asteroid 3753 Cruithne. They orbit the Sun in a flight path so similar to Earth’s that it runs parallel to the planet in a 365-day orbit. The Kamo’oalewa semi-satellite is governed primarily by the Sun’s gravity but appears to orbit Earth in a corkscrew-like orbit.

Some celestial bodies like asteroid 2010 TK7 called the Moon because They are attracted by the gravity of the solar system Earth or Earth – Moon. The gravity of the two largest celestial bodies creates a region of centripetal force called the Lagrangian, holding small objects fixed to a stable point in space, according to NASA. The two Lagrange points are L4 and L5, forming an equilateral triangle with the Earth. Objects attracted by the Lagrange point are called Trojan horses and will join the Earth’s orbit around the Sun.

Heo Horvath, Lagrangian points L4 and L5 grows and begins to capture interplanetary dust particles. Some astronomers call this a particle cloud “Ghost Moon”. They are also called Kordylewski clouds, named after the Polish astronomer who first described them in the 1960s. However, ghost moons never become solid moons because the dust layer does not stick together . Although the Lagrange point is always stable, dust particles frequently join or leave the cloud.

Article source: VnExpress

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Over centuries of exploration, researchers have discovered that Earth has 0 to several Moons depending on the time period. The Earth appears to have only one Moon…

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