And NASA's Mars rover Curiosity has deceptively found something that is quite interesting on Mars, and the space agency has chose to reveal its discovery in a press conference which is to be held on Thursday.
They could be evidence for the development of ancient life on Mars but they could also have come from a meteorite or other sources, Efe reported.
Using Curiosity's Sample Analysis at Mars instrument - which heats soil and rock samples to examine their contents - astrobiologist Jennifer Eigenbrode and her colleagues were able to identify an array of interesting organic molecules: Ring structures known as aromatics, sulfur compounds and long carbon chains. And this mission has been successful in finding new evidence that Mars could have supported life in the past.
However, all this does not prove that there is or ever was life on Mars. During the summer months, levels of the gas detected by Curiosity rose to about 0.7 parts per billion; in winter, they fell to roughly half that. Methane is another organic molecule.
"There are active processes happening in the Martian subsurface today, which could include heated reactions between water and rocks, possible biological activity, or some other mechanism", Siebach noted. "Finding ancient organic molecules in the top five centimeters of rock that was deposited when Mars may have been habitable, bodes well for us to learn the story of organic molecules on Mars with future missions that will drill deeper".
More recently, at the beginning of 2018, the Curiosity was thought to have found evidence of bioturbation, which is what occurs when organisms living in sediments leave an imprint on their structure.
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The discovery has been reported in the journal Science by NASA's Jennifer Eigenbrode and an global team of scientists.
JPL's Christopher Webster, lead author on the study, said it's the first time Martian methane has shown a repeated pattern.
NASA associate administrator Thomas Zurbuchen says the agency wants to keep searching for signs of life on Mars.
Organic molecules containing chlorine were detected on Mars before.
He and his colleagues think the methane is coming from underground.
The organic molecules were found in Gale Crater, which is believed to have once contained a shallow lake.
Scientists do not exclude a biological origin of the methane, due to the fact that its level changes from season to season. But the scientists who have published two studies in the journal Science, are optimistic: this means that the organic matter can be preserved in the most challenging environments on the planet Mars.