NASA | Mars' Ancient Ocean

NASA researchers have provided the most accurate estimate of Mars' water history, revealing that at least 20% of the Martian surface was once covered by an ocean with a depth of about one mile. Over billions of years, nearly 90% of this water was lost to space, with the rest trapped in the polar caps. This new understanding suggests Mars was much wetter than previously thought, increasing the likelihood of ancient habitability.

What was the primary focus of the initial discussion about Mars's climate?

• The composition of Mars's atmosphere

• The current temperature on Mars

• The historical climate and water loss on Mars

• The presence of life on Mars

What method did NASA's Goddard Space Flight Center use to estimate Mars's water history?

• Seismic activity measurement

• Satellite imagery

• Soil sample analysis

• Atmospheric ratio of water molecules

According to NASA's findings, what percentage of Mars's surface was once covered by water?

• 70%

• 50%

• 20%

• 10%

What happened to the majority of Mars's ancient ocean?

• It evaporated into the atmosphere

• It was absorbed into the ground

• It froze into glaciers

• It was lost to space

What does the new picture of early Mars suggest about its potential for ancient habitability?

• Mars was never habitable

• Mars's habitability is still unknown

• Mars had a dry and barren past

• Mars had conditions that could support life