Scientists noted such organic molecules can also be created by non-biological processes “and are not necessarily indicators of life.”
Whether the source of the molecules existed in the absence of life or had food for life, "organic matter in Martian molecules holds chemical clues to planetary conditions and processes," Jen Eigenbrode, of NASA's Goddard Space Flight Center and lead author of the new research set to be published in the journal Science, said in a news release Thursday.
“The chances of being able to find signs of ancient life with future missions, if life ever was present, just went up,” Curiosity project scientist, Ashwin Vasavada, added.
Scientists also found seasonal variations in methane on the planet’s atmosphere over three years (about six Earth years).
Michelle Thaller, of NASA’s Planetary Science Division, hosted the chat, which featured Paul Mahaffy, director of the agency’s solar system exploration division at the Goddard Space Flight Center; Jet Propulsion Laboratory research fellow Chris Webster; Goddard scientist Jen Eigenbrode; and Mars project scientist Vasavada.
The rover, which has been exploring planet Mars since it landed in August 2012, recently analyzed drilled samples on Mars for the first time since October 2016.
“This was no small feat. It represents months and months of work by our team to pull this off,” Jim Erickson, project manager of the Mars Science Laboratory mission, told the agency this week. The Curiosity rover is part of the MSL mission. “JPL's engineers had to improvise a new way for the rover to drill rocks on Mars after a mechanical problem took the drill offline in December 2016.”
The drilling method’s successful improvements mean engineers can efficiently continue studying the 3-mile-high Mount Sharp at the center of Gale Crater, which the rover is currently climbing.
The mission's overall purpose, according to NASA, is to determine whether the planet was ever able to support microbial life.
By analyzing rock samples collected by the rover, scientists have identified key chemical ingredients of life on the planet, such as sulfur, nitrogen, hydrogen, oxygen, phosphorus and carbon.
The Mars Curiosity rover has also measured spikes in methane, which may be a result of interaction of water and rock.
"I'm confident that our ongoing and planned missions will unlock even more breathtaking discoveries on the Red Planet," Thomas Zurbuchen, associate administrator for the Science Mission Directorate at NASA Headquarters, said in the Thursday news release.
The findings will be published as two papers in the journal Science.