Earth's Development and Origin of the Solar System

Early Form of Earth

• 4 billion years ago, it was a boiling sphere of lava.
• No trace of life.

Origin of the Solar System

• 4.6 billion years ago: Solar system did not exist.
• A cloud filled with dust and gas called the "solar nebula."
• Hydrogen and helium gases in the largest quantities.

Supernova and Solar Nebula

• A supernova explosion from a nearby dying star affected the solar nebula.
• Gas and dust condensed and started rotating, forming a proto-planetary disk.

Proto-Planetary Disk

• The formation of the proto-planetary disk and its flat shape.
• Birth of the proto-star and the creation of the sun through the nuclear fusion process.

Formation of Planets

• Dust particles collided and stuck together.
• The process of forming planetary bodies known as accretion.

Development of Earth

• Collision of proto-planets and planetesimals.
• After the collision, the birth of Earth, formation of lava oceans.
• Arrival of essential elements for life on Earth.

Origin of the Moon

• Giant Impact Hypothesis: The moon was formed by the collision of a proto-planet.
• Moon's contribution to the development of life on Earth.

Earth's Internal Structure

• Crust, mantle, and core: Three main layers.
• Heavy elements (iron, nickel) drawn towards the center of the Earth.
• Earth's core is heated due to radioactive decay.

Earth's Magnetic Field

• Formation of Earth's magnetic field due to the movement of iron.
• Importance of the magnetic field for life.

Other Significant Events

• Development of the solar system and the arrival of water on Earth.
• Earth being at the right distance, having the right size and gas balance.

Conclusion

• Marvelous structure of Earth and the origin of life.
• It is essential to preserve this wonderful planet.