Water on Mars: New NASA study suggests Red Planet once had more water than Earth's Arctic Ocean

The video discusses Mars's ancient ocean, which covered 19% of its surface, similar to Earth's Atlantic Ocean. Mars had significantly more water in the past, but lost 87% of it to space. The presence of heavier water molecules, HDO, indicates this loss. The video explains the composition of HDO, where a deuterium atom replaces a hydrogen atom, making it a heavy isotope of hydrogen.

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