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How do planets form and evolve over time?

Stage 1: Birth in a Protoplanetary Disk

Origin: Planets start their life in massive clouds made up of gas and dust in space.
These clouds are very cold and thick.

Star Formation: Gravity pulls parts of these clouds together, forming young stars.
Around these stars, leftover material spins around, creating a disk called a protoplanetary disk.
Dust to Planetesimals: Small dust particles stick together when they collide.
They grow into pebbles, then rocks, and finally into large objects called planetesimals, which are about a kilometer in size.

Stage 2: Growth into Planets

Accretion: Planetesimals keep colliding and joining together, growing into bigger bodies called protoplanets.
Gravity helps them pull in more material.
Gas Giants vs. Rocky Planets:
In the colder areas, far from the star, icy cores can gather gas, leading to the formation of gas giants like Jupiter and Saturn.
In the warmer, closer regions, rocky planets like Earth and Mars form more slowly because there's less gas available.

Stage 3: Planetary Evolution

Once planets are formed, they continue to change over time through:

Internal Processes

Differentiation: Heavier materials sink toward the center, creating layers such as the core, mantle, and crust.
Volcanism & Tectonics: Heat from inside the planet causes geological activity, which shapes the surface.

External Influences

Impacts: Collisions with asteroids or comets can change a planet's surface and atmosphere.
Migration: Some planets move from their original positions due to gravitational forces, especially in younger systems.

Atmospheric Changes

Outgassing: Volcanic eruptions release gases, which help form the planet's atmosphere.
Loss or Gain: The solar wind, impacts, and chemical reactions can remove or add gases to the atmosphere over time.

Long-Term Evolution

Climate Shifts: Changes in a planet's orbit, tilt, or atmosphere can affect its climate.
Habitability: The conditions on a planet may become good or bad for life to exist.
Stability: Over billions of years, planetary systems settle into more stable orbits.
Bonus: Our Solar System's Timeline
Gas giants like Jupiter and Saturn formed quickly, within the first 10 million years.
Terrestrial planets like Earth took tens of millions of years to form after the Sun began to shine.

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