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The Blue Marble Photo
- In 1972, three NASA astronauts took the iconic "Blue Marble" photo of Earth.
- This photo highlights water as Earth's defining feature, covering over two-thirds of its surface.
The Water Paradox
- Earth's abundance of water is puzzling considering its hot origins.
- Early Earth was too hot for liquid water to condense, making its presence a mystery.
Molten Earth
- Early Earth was a molten magma marble, too hot for liquid water.
- The question arises: how did so much water condense on such a hot planet?