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Regarding early earth formation and continental drift, 2022
Earth's origins remain a conundrum. This artistic visualization shows Earth today (right) vs Ea... more Earth's origins remain a conundrum. This artistic visualization shows Earth today (right) vs Earth 4.5 billion years ago (left). (Image credit: Tobias Stierli/NCCR PlanetS) Jump to: The core accretion model? The disk instability model Pebble accretion Additional resources Earth's formation remains a strange, scientific mystery. We live on a planet in a solar system with seven other planets and have discovered thousands of exoplanets to date. But how planets like Earth form still remains a subject of great debate. Currently, there are two leading theories on planetary formation. Scientists continue to study planets in and out of our solar system in an effort to better understand which of these theories most accurately describes how the solar system and its planets formed. The first and most widely accepted theory is the core accretion model, which works well to explain the formation of terrestrial planets like Earth but doesn't fully account for giant planets. The second theory, called the disk instability method, may account for the creation of larger planets. These two leading theories are joined by the pebble accretion theory which helps to additionally explain how different objects might form. Related: Earth's layers: Exploring our planet inside and out Click here for more Space.com videos... WHAT IS THE CORE ACCRETION MODEL? Artist's conception of our solar system's solar nebula, the cloud of gas and dust from which Earth, the sun and our solar system's other planets planets formed. (Image credit: Painting copyright William K. Hartmann, Planetary Science Institute, Tucson) Approximately 4.6 billion years ago, our solar system was just a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, condensing the matter and forming the sun in the center of the nebula.
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Videos by Subbaraman Ramaswamy
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