NASA's Curiosity rover is continuing to assist scientists piece together the mystery of how Mars lost its surface water over the course of billions of years.
The rover drilled into a piece of Martian rock called Cumberland & found some ancient water hidden within it. Researchers were then able to test a key ratio in the water with Curiosity's onboard instruments to gather more data approximately when Mars started to lose its water, NASA officials said. In the same sample, Curiosity moreover detected the first organic molecules it has found. Mission scientists announced the discovery in a news conference today (Dec. 15) at theÂ American Geophysical Union's convention in San Francisco, where they moreover unveiled Curiosity'sÂ first detection of methane on Mars.
"It's really absorbing that our measurements from Curiosity of gases extracted from ancient rocks can tell us approximately loss of water from Mars," Paul Mahaffy, Curiosity's SAM (Sample Analysis at Mars) instrument principal investigator at NASA's Goddard Space Flight Center in Greenbelt, Maryland, said in a statement. [Photos: The Search for Water on Mars]
p> Curiosity measured the ratio ofÂ deuterium (heavy hydrogen) toÂ "normal"Â hydrogen. This D-to-H ratio can assist scientists see how long itÂ takes for water molecules to escape, because the lighter hydrogen molecules fly toward the upper atmosphere more freely than deuterium does.
The D-to-H ratio in Cumberland is approximately half the ratio found in the Martian atmosphere's water vapor today, NASA officials said. This suggests thatÂ theÂ planet lost muchÂ of its surface water after the Cumberland rock formed, space agency officials addedÂ in theÂ same statement.
ButÂ the water sample is alsoÂ about three times "heavier" than Earth's oceans. This means that if Mars' surface water started off with a D-to-H ratio like Earth's, then most of theÂ Martian waterÂ likely disappeared before Cumberland formed approximately 3.9 billion to 4.6 billion years ago.
The Cumberland measurement fills in a gap for scientists studying different epochs of Martian geological evolution. This sampling marks the first time scientists have been able to measure what the water on Mars may have been like during the Hesperian period, when this rock was formed, said Mahaffy, who is the lead author of a Mars water study published in the journal Science this week.
Previously, scientists have used Martian meteorites on Earth to sample Martian water; however, none of those space rocks date back to the Hesperian period.
"You have the whole period from 2.5 billion to 4 billion years old, & there's no data that we have from Mars meteorites just because we haven't found any yet, I guess," Mahaffy told Space.com. "So, it's very gratifying to be able to fill in that picture a little bit."
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