The birth of our solar system from a nebula cloud composed of dust and gas.
The nebular theory proposes that a spinning cloud of material composed largely of light components, known as a nebula, flattened into a protoplanetary disk and evolved into a solar system composed of a star and orbiting planets. We can establish a reasonable estimate of the total number of planets in the Universe based on what we know about stars, gravity, and cosmic history, and it likely outnumbers our stars by a ratio of 100 to 100,000. Space is teeming with planets, most of which lack stars.
Our galaxy, the Milky Way, is just one of billions of galaxies in the cosmos. There are at least 100 billion stars within it, and each star has at least one planet around it. This suggests that there might be hundreds of planetary systems similar to our solar system throughout the Cosmos.cosmos
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