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.

What percentage of Mars's surface is believed to have been covered by its ancient ocean?

How does the volume of water on Mars compare to the water in its ice caps today?

What is the significance of the heavy isotope of hydrogen found on Mars?

What does the discovery of heavier water molecules on Mars indicate about its water loss?

What is the estimated percentage of water that Mars has lost to space?