Our solar system began as a giant ball of gas
In short: Before the eight planets and hundreds of moons existed, our cosmic backyard was nothing more than an explosive cloud of gas and dust. Understanding how this massive nebula transformed into the structured system we inhabit today reveals the violent, fascinating history of our place in the Milky Way.
The solar system's origin is a story of transformation. It began as a massive, rotating ball of gas that underwent an explosive evolutionary process to become the structured arrangement of planets and celestial bodies we observe today. At the heart of this system sits the Sun, an average star that exerts enough gravitational force to influence every orbiting body. Remarkably, the Sun contains more than 99 percent of the entire system's mass.
The architecture of our neighborhood is defined by distance. Moving outward from the Sun, the planets follow a specific order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The composition of these worlds varies significantly based on their proximity to the Sun. While all planets except Mercury and Venus possess at least one moon, the four outermost giants—Jupiter, Saturn, Uranus, and Neptune—are also distinguished by their ring systems.
Beyond the eight primary planets, the system includes five officially named dwarf planets and a vast array of smaller objects. This includes at least 290 moons, over 1.3 million asteroids, and approximately 3,900 comets. The discovery of icy objects like Eris and others in the Kuiper belt led to the reclassification of Pluto, which had been considered a planet since its 1930 discovery. Today, our solar system resides within the Orion Arm of the Milky Way, orbiting the galactic center at roughly 515,000 mph.
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Sources
- Summary by Intellect · source: Introduction to the Solar System: Crash Course Astronomy #9
- Also: Solar System Exploration
- Also: Solar system | Definition, Planets, Diagram, Videos, & Facts | Britannica
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