Time Spiral. Illustration credit Pablo Carlos Budassi via Wikipedia
The time spiral depicted here includes several key milestones. At the center is the Big Bang, marking the start of time around 13.8 billion years ago.
Shortly after, atoms formed, followed by stars and galaxies.
Our Sun formed around 4.6 billion years ago, soon followed by Earth.
Life on Earth began about 3.8 billion years ago, with the emergence of cells and photosynthesis within the next billion years. Multicellular life started thriving around 1.7 billion years ago. Fish appeared roughly 500 million years ago, and mammals began walking on land about 200 million years ago.
Humans emerged about 6 million years ago and built the first cities about 10,000 years ago. Although the time spiral ends there, notable recent events include the start of human spaceflight about 75 years ago and the rise of useful artificial intelligence in the past few years.
Illustration credit Pablo Carlos Budassi via Wikipedia
source APOD
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