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The Emergence of Life on Earth: A Journey Through Time

Explore the fascinating journey of life on Earth, from a supernova explosion 4.6 billion years ago to the evolution of dinosaurs and mammals. Learn about key milestones like the first cells and mass extinctions, as documented in CS Brown's "Big History."

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The Emergence of Life on Earth: A Journey Through Time

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  1. How did life emerge By Crby cr steussy Most material from CS Brown’s “Big History”

  2. Earth • About 4.6 bil yrs ago a supernova exploded in the Milky Way • From the debris our star, the sun, and planets, including earth appeared.

  3. Earth • About 4 billion years ago as the earth cooled bubbles formed in the molten lava

  4. Early Earth • From 3.8 to 1.8 billion years ago a sort of blue-green bacteria spread across the cooling earth. • The first form of life.

  5. Early Earth • The earliest cells (right) had no nuclei. • eukaryotic cells with nuclei began about 1.9 billion years ago • The “Goldilocks conditions”

  6. not so- Early Earth • Around 600 Million (with an M) the first soft tissues sea creatures, about the width of 5 human hairs, appeared. • Goldilocks conditions

  7. not so- Early Earth • Between 400-600 Million years ago animals with “hard parts” like trilobites emerged, as did plants and something like a sow bug (right) crawled from the sea. • The so-called “Cambrian explosion”

  8. not so- Early Earth • Around 250 million years ago a mass extinction occurred. • Fungus ruled the earth of pangea afterwards

  9. not so- Early Earth • 200 million years ago reptiles appeared that evolved into dinosaurs • Flowering plants and hardwood trees emerged 100 million years ago

  10. Earth • Around 65 million years ago a massive asteroid impact caused the extinction of the dinosaurs. • In its wake mammals began to flourish

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