If you’ve seen models of the solar system, you’ve noticed that the sun, planets, satellites, and asteroids are in about the same plane. But why?
To answer this question, we must go to the first stage of the solar system about 4.5 billion years ago.
at that time, Solar system Nader Hagi Hypur, an astronomer at the University of Hawaii at Manoa, told Live Science. The giant cloud measured a total of 12,000 astronomical units (AU). 1 AU is Earth And the sun, or about 93 million miles (150 million kilometers). Haghighipour said the cloud had grown so large that it was only filled with molecules of dust and gas, but the cloud itself began to collapse and shrink under its own mass.
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As the spinning cloud of dust and gas began to collapse, it also flattened. Imagine a pizza maker throwing a spinning dough slab into the air. As it rotates, the dough expands, but becomes thinner and flatter. That’s what happened to the very early solar system.
Meanwhile, in the center of this constantly flattening cloud, all those gas molecules were squeezed together very much, they became hot, Haghighipour said. Under enormous heat and pressure hydrogen When helium The atoms fused and initiated a billion-year-old nuclear reaction in the form of a baby star, the Sun. For the next 50 million years, the sun continued to grow, collecting gas and dust from its surroundings, spitting out intense heat and radiant waves. Slowly, the growing sun wiped out the donuts in the empty space around it.
As the sun grew, the clouds continued to collapse, “forming a disk around the stars. [that] It will become flatter and flatter and will expand around the sun, “said Hug Haipur.
Eventually, the clouds became a flat structure called a protoplanetary disk, orbiting a young star. According to Hug Haipur, the disc stretched over hundreds of AU, only one-tenth the thickness of that distance.
For the next tens of millions of years, the dust particles of the protoplanetary disk swirled gently, sometimes bumping into each other. Some were stuck together. And for those millions of years, those particles became millimeter-length particles, those particles became centimeter-long pebbles, and the pebbles continued to collide and stick together.
Eventually, most of the material in the protoplanetary disk stuck together to form a giant object.Some of those objects grow very large, and gravity makes them spherical planets, dwarf planets, and Month.. Other objects, such as asteroids, comets, and some small satellites, have become irregularly shaped.
These objects vary in size, but they more or less stay on the same plane where the building materials originated. As a result, eight planets and other celestial bodies in our solar system are still orbiting at about the same level today.
Originally published in Live Science.
Why do the planets of the solar system orbit in the same plane?
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