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A diagram of concentric arcs around a circle, representing the geological ‘clock’ of life, and depicting milestones in billions of years ago (Ga): - Earth: 4.55 Ga - Life 4Ga - Photosynthesis: 3.2Ga - Oxygenation: 2.3Ga - Eukaryotes: 2.1Ga - Multi-cellular life: 1.5Ga - Animals: 0.65Ga - The Cambrian Explosion: 0.54Ga - Populating the land: 0.4Ga - Mammals: 0.2Ga - Dinosaurs dying out: 0.066Ga - Humans: 0.0025Ga.

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A diagram of concentric arcs around a circle, representing the geological ‘clock’ of life, and depicting milestones in billions of years ago (Ga): - Earth: 4.55 Ga - Life 4Ga - Photosynthesis: 3.2Ga - Oxygenation: 2.3Ga - Eukaryotes: 2.1Ga - Multi-cellular life: 1.5Ga - Animals: 0.65Ga - The Cambrian Explosion: 0.54Ga - Populating the land: 0.4Ga - Mammals: 0.2Ga - Dinosaurs dying out: 0.066Ga - Humans: 0.0025Ga.
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Jonathan Schofield (urlyman@mastodon.social)'s status on Tuesday, 17-Dec-2024 17:29:29 JST Jonathan Schofield
in reply to

…If you’ve watched Tom on cosmology (link above), you’ll understand that we are orbiting an unexceptional star in an unexceptional galaxy in an unexceptional region of the known universe, which may perhaps also be an unexceptional universe.
The universe is *not about us*.
Tom’s next video walks us through early life on Earth. He places major landmarks in the evolution of life on a 12-hour clock and shows humans arriving just before midnight.
And the important takeaway is…

In conversation about a month ago from mastodon.social permalink