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Unveiling the Solar System’s Flatness: A Matter of Spinning Pizza Dough

If you have carefully observed the solar system model, you may have noticed that the sun, planets, satellites and asteroids are all approximately on the same plane. But why is this so?

To answer this question, let us first go back to about 4.5 billion years ago, when the solar system was first formed.

At that time, the solar system was just a huge, constantly rotating cloud of dust and gas, with a diameter of about 12,000 astronomical units (one astronomical unit is the average distance between the earth and the sun, which is about 150 million kilometers). Because the cloud is so large, even though it contains only dust and gas molecules, it begins to collapse and shrink under the pressure of its own mass.

As the swirling cloud of dust and gas began to collapse, it became flatter and flatter, like a pizza chef flipping dough into the air and spinning it into a flatbread. At the same time, in the center of this increasingly flattened gas cloud, all the gas molecules are tightly packed together, and the temperature is getting higher and higher. Under this extreme high temperature and pressure, hydrogen and helium atoms began to fuse, triggering a nuclear reaction that lasted billions of years, and a young star was formed – this is our sun. Over the next 50 million years, the sun continued to grow, collecting gas and dust from its surroundings while releasing large amounts of heat and radiation. As the sun continues to grow, a clearing gradually clears around it, like a donut.

As the sun continues to grow, the gas cloud continues to collapse, forming an increasingly flatter and larger disk around the star.

Eventually, this cloud formed a flat structure orbiting the star called a protoplanetary disk. According to Haji Jipur, the diameter of this protoplanetary disk reaches thousands of astronomical units, but the thickness is only one-tenth of the diameter.

Over the tens of millions of years that followed, the dust particles in the protoplanetary disk continued to rotate slowly, occasionally colliding with each other, and some even coalescing together, gradually turning into large particles several millimeters long, and then again It became a few centimeters long pebbles. These pebbles continue to collide and combine, eventually turning into huge celestial bodies. After these celestial bodies reached a certain size, they were gradually shaped into spherical planets, dwarf planets and satellites under the influence of gravity. Other celestial bodies are less regular in shape, such as asteroids, comets, and some small satellites.

Although these celestial bodies vary in size, they are basically located on the same plane because the raw materials that make them come from this plane. This is why today’s eight planets in the solar system and other celestial bodies revolve around the sun on the same plane.

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