Which planet was the first to form in the solar system?

There are about 100 young planets in the nascent solar system, and their orbits are chaotic, colliding and merging with each other. After about 500 million years of collisions, more than 100 planets have evolved into the current eight planets, and the eight planets we see today are the ultimate survivors of the original state of chaos.

So it's really hard to verify this, for example, the current Earth was formed by the collision and fusion of the newborn Earth and another planet, Theia. The two planets are almost the same size, so should the age of the Earth be the age of the acoustic Earth or the age of Theia? When was Theia born?

There is no way to verify it now.

The gas giant is even more difficult to study because it is covered by a dense atmosphere, which changes at any time, and we cannot detect its geology. It is not possible to determine its exact age, only an approximate estimate. The only accurate estimate we can make is that the Earth was born 4.6 billion years ago.

We don't know much about the other planets, and we can only estimate that they were born between 50 and 4 billion years ago. The birth of gas giants should be a little slower than the four terrestrial planets in the inner solar system, because gas giants are so large that their accretion process takes longer.

The exact time is impossible to verify, at least at the current level of human science and technology.

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Seventh.

Earth is the third planet in the solar system from the inside and outside, and it is also the terrestrial planet with the largest diameter, mass and density in the solar system, about 100 million kilometers (1 astronomical unit) from the sun. The Earth rotates from west to east while revolving around the Sun. At present, the earth has a natural satellite - the moon - the earth, and the two form a celestial system - the earth-moon system.

It originated hundreds of millions of years ago from the primordial solar nebula.

The radius of the Earth's equator is kilometers, the polar radius is kilometers, the average radius is about 6371 kilometers, and the circumference of the equator is about 40075 kilometers. The Earth's surface area is 100 million square kilometers, of which 71% is oceans and 29% is land. The main components of the atmosphere are nitrogen and oxygen, as well as small amounts of carbon dioxide and argon.

The age of the earth. In the 21st century, scientists have reconfirmed the age of the earth, believing that the earth was created much later than the time of the solar system, spanning about 100 million years, which is much later than the previously thought 30-45 million years.

Previously, scientists calculated that the solar system was formed 100 million years ago through the formula for calculating the age of the solar system, and the age of the earth was about 3 billion to 4.5 billion years later than the solar system, about 100 million years ago. In 2007, Swiss scientists revised the data to conclude that the Earth was created 62 million years after the formation of the solar system.

The Earth is the third planet in the solar system from the inside and outside, 149 597 kilometers 1 astronomical unit away from the sun, is the only celestial body in the universe known to mankind to have life, and is also a planet inhabited by human beings, with a total population of 100 million. With a mass of about kilograms, a radius of about 6,371 kilometers and an average density of g cm3, it is the highest among the planets in the solar system.

The earth rotates and revolutionizes at the same time, resulting in the change of day and night and the four seasons, respectively, with one solar day rotating once and one solar year rotating once in one solar year. The rotating orbital plane is called the equatorial plane, the orbital orbital plane is called the ecliptic plane, and the angle between the two is called the yellow-equatorial angle. The Earth has only one natural satellite, the Moon.

Earth is one of the planets in the solar system.

The solar system is composed of the sun, 8 planets, more than 100 moons, many dwarf planets and countless small meteors, comets, and meteoroids.

The planets are in alphabetical order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury, Venus, Earth, and Mars, which are close to the Sun, are called terrestrial planets.

Their common characteristics are high density (>, small size, slow rotation, few satellites, mainly silicate (silicate) internal composition, and a solid shell. Jupiter, Saturn, Uranus, and Neptune, which are far from the Sun, are called Jovian planets.

The Solar System, the planetary system in which we live, is located in the Orion Arm of the Milky Way, about 10,000 light-years from the center of the Milky Way. The solar system is a very unique planetary system, the only galaxy in the universe known to mankind that has intelligent life. Since the beginning of human exploration of the universe, we have a general understanding of the solar system, but scientists have been searching for an answer to how the solar system was born.

With the advancement of science, scientists have speculated through research that the solar system was born about 4.6 billion years ago and was formed by the gravitational collapse of giant molecular clouds. Before the solar system was formed, it was a quiet cloud of gas with very low temperatures. On a certain day, a massive star near the cloud died, that is, a supernova explosion, and a huge shock wave passed directly through the molecular cloud, resulting in a gravitational collapse, due to the conservation of angular momentum, the collapsed gas cloud rotated faster, the temperature became hotter and hotter, and slowly formed a protoplanetary disk.

In the center of the protoplanetary disk, the temperature and density are extremely high, and the hydrogen gas continues to collapse, and when it reaches a certain mass, a thermonuclear reaction finally occurs, and the sun is born.

4.6 billion years ago, there was a solar nebula made up of swirling particles of gas and dust, and it was from this nebula that our sun was born. The sun is born and then as the remaining pieces of material of different sizes orbit our star at slightly different speeds, they begin to collide and bond together, and under the influence of gravity, small particles grow into large particles, ranging from kilometers to hundreds of kilometers in diameter, and this process continues until the diameter of these objects reaches thousands of kilometers. But away from the stars, the Sun's constant stream of charged particles does not have a strong effect on the lighter elements, which combine to become gas giants.

I think he's different from other people who are single, and the earth is relatively large.

Earth is a planet in the solar system.

The Earth is the third planet in the Solar System and the largest terrestrial planet in the Solar System in terms of diameter, mass and density, at a distance of about 100 million kilometers (1 AU) from the Sun. The Earth rotates from west to east while revolving around the Sun. At present, the earth has a natural moon-moon-moon, and the two form a celestial system-Earth-Moon system.

It originated hundreds of millions of years ago from the primordial solar nebula. The nebula hypothesis asserts that the microplanets that form the Earth originate from the massaching masses of gas, ice particles, and dust with a diameter of 1 to 10 kilometers that are left over from accretion and collapse. The interior of the earth is divided into the core, mantle, and crustal structure, and the surface of the earth has a hydrosphere, atmosphere, and magnetic field.

The Earth is the only celestial body in the universe where life is known, and it is home to millions of living beings, including humans.

The Earth's surface composition

The total surface area of the Earth is about 100 million square kilometers, about the surface area is covered by water, and most of the surface of the Earth's crust (100 million square kilometers) is below sea level. The crustal surface of the seafloor is mountainous, including a global system of mid-ocean ridges, as well as submarine volcanoes, trenches, submarine canyons, submarine plateaus, and abyssal plains. The remaining 148.94 million square kilometers, or 57.51 million square miles) are not covered by water, including mountains, basins, plains, plateaus, and other terrain.

The surface has been reshaped over a long period of time by tectonic and erosion. Plate tectonic movements can alter the landscape, as can wind, precipitation, erosion of the surface such as the thermal cycle, and chemical processes. Glaciation, coastal erosion, coral reef formation, and the impact of large meteorites can all have an impact on the reshaping of landscapes.

The above content refers to Encyclopedia - Earth.