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Timeline ((First multi celled organism was 5.4 million years ago, Humans…
Timeline
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Humans invented agriculture 5,000 years ago
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Homo sapiens left Africa 64,000 million years ago
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Dinosaurs go extinct about 65,000,000 billion years ago
Homo sapiens come about 250,000 million years ago
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Our galaxy is about 100,000 light years
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Eruption of mount toba 74,,000 reduced the human population to a few thousand
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By dating the rocks in the ever-changing crust, as well as neighbors such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion
Results from NASA's Wilkinson Microwave Anisotropy Probe (WMAP) released in February 2003 show that the first stars formed when the universe was only about 200 million years old. Observations by WMAP also revealed that the universe is currently about 13
The evolution of multicellular life from simpler, unicellular microbes was a pivotal moment in the history of biology on Earth and has drastically reshaped the planet’s ecology. However, one mystery about multicellular organisms is why cells did not return back to single-celled life.
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Anatomically, modern humans can generally be characterized by the lighter build of their skeletons compared to earlier humans. Modern humans have very large brains, which vary in size from population to population and between males and females, but the average size is approximately 1300 cubic centimeters.
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A galaxy is a grouping of stars bound together by gravity. All but a few stars in the universe live in galaxies. Our Sun is just one of at least 200 billion stars in our own Milky Way Galaxy.
