Tech & Science Building Blocks of Life Found on Mars

11:33  08 june  2018
11:33  08 june  2018 Source:   nationalgeographic.com

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Space.com's Tariq Malik on NASA reporting it found the building blocks of life on Mars and the private space race.

Scientists say a NASA robot has detected more building blocks for life on Mars from 3.5 billion-year-old rocks on the surface of the Red Planet. (AFP) For

Day to day, it’s easy to lose sight of an astonishing fact: Since 2012, humankind has been driving a nuclear-powered sciencemobile the size of an SUV on another planet.

This engineering marvel, NASA’s Mars rover Curiosity, has revolutionized our understanding of the red planet. And thanks to the intrepid rover, we now know that ancient Mars had carbon-based compounds called organic molecules—key raw materials for life as we know it.

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Nasa to send helicopter to Mars Jump to media player The US space agency says it will be the first test of a heavier-than-air aircraft on another planet. Nasa says organic matter found at the bottom of a crater on the Red Planet suggests there might have been life there once.

Two landmark discoveries reveal organic carbon on the red planet, shaping the future hunt for life on Mars . Please use a supported version for the best MSN experience. Building Blocks of Life Found on Mars .

NASA's Curiosity rover drilled this two-inch-deep hole in a Martian rock as part of its examinations of the red planet's soil composition. © Photograph by NASA NASA's Curiosity rover drilled this two-inch-deep hole in a Martian rock as part of its examinations of the red planet's soil composition.

A new study published in Science on Thursday presents the first conclusive evidence for large organic molecules on the surface of Mars, a pursuit that began with NASA’s Viking landers in the 1970s. Earlier tests may have hinted at organics, but the presence of chlorine in martian dirt complicated those interpretations.

“When you work with something as crazy as a rover on Mars, with the most complex instrument ever sent to space, it seems like we’re doing what may have been perceived earlier as impossible,” says lead author Jennifer Eigenbrode, a biogeochemist at NASA Goddard. “I work with an amazing group of people on Mars, and we have discovered so much.”

Life on Mars? Rover's Latest Discovery Puts It 'On the Table'

  Life on Mars? Rover's Latest Discovery Puts It 'On the Table' The identification of organic molecules in rocks on the red planet does not necessarily point to life there, past or present, but does indicate that some of the building blocks were present.Scientists for the first time have confidently identified on Mars a collection of carbon molecules used and produced by living organisms.

Organic molecules is not synonymous with life . If that was true, then the headline of this article would have been "Scientists find life on Mars !!!!" The scientists themselves are merely saying they found building blocks for what could have been life .

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Curiosity's latest data reveal that the watery lake that once filled Mars’s Gale Crater contained complex organic molecules about 3.5 billion years ago. Hints of them are still preserved in sulfur-spiked rocks derived from lake sediments. Sulfur may have helped protect the organics even when the rocks were exposed at the surface to radiation and bleach-like substances called perchlorates.

By themselves, the new results aren't evidence for ancient life on Mars; non-living processes could have yielded identical molecules. At a minimum, the study shows how traces of bygone martians could have survived for eons—if they existed at all—and it hints at where future rovers might look for them.

“This is an important finding,” says Samuel Kounaves, a Tufts University chemist and former lead scientist for NASA's Phoenix Mars lander. “There are locations, especially subsurface, where organic molecules are well-preserved.”

NASA Curiosity Rover Finds Building Blocks of Life on Mars

  NASA Curiosity Rover Finds Building Blocks of Life on Mars The robot, which has been exploring Mars for almost six years, discovered new organic compounds and cycles of methane that could point to life on Mars.One possible biosignature on Mars-or a sign leading to potential biosigantures-is the presence of organic compounds. Almost all molecules containing carbon are organic compounds, and these molecular structures are frequently produced and consumed by living organisms. There are other ways to produce organic compounds, so they are not a smoking gun for life-but they are an awfully good sign.

Day to day, it’s easy to lose sight of an astonishing fact: Since 2012, humankind has been driving a nuclear-powered sciencemobile the size of an SUV on

Two landmark discoveries reveal organic carbon on the red planet, shaping the future hunt for life on Mars .

Seasons of Methane

a horse in a field: Rocks line an ancient channel where water may have once flowed on Mars. © Photograph by NASA Rocks line an ancient channel where water may have once flowed on Mars.

In addition to ancient carbon, Curiosity has caught whiffs of organics that exist on Mars today. The rover has periodically sniffed Mars’s atmosphere since it landed, and in late 2014, researchers using these data showed that methane—the simplest organic molecule—is present in Mars’s atmosphere.

Methane’s presence on Mars is puzzling, because it survives only a few hundred years at a time, which means that somehow, something on the red planet keeps replenishing it. “It’s a gas in the atmosphere of Mars that really shouldn’t be there," says NASA Jet Propulsion Lab scientist Chris Webster.

In addition, methane's observed behavior on Mars is bizarre. In 2009, researchers reported that inexplicable martian plumes randomly belch out thousands of tons of methane at a time.

Webster’s latest study, also published today in Science, shows that Mars seasonally “breathes” the stuff. Each martian summer, the atmosphere’s methane concentration rises to about 0.6 parts per billion. In the winter, this count ebbs by a factor of three to 0.2 parts per billion.

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NASA "화성 대기중 메탄•암석 내 유기물 확인" NASA's Mars Curiosity rover has made some startling discoveries. The Red Planet may have the building blocks of life

A NASA robot has detected more building blocks for life on Mars — the most complex organic matter yet — from 3.5 billion-year-old rocks on the surface of the Red Planet, scientists said Thursday. The unmanned Curiosity rover has also found increasing evidence for seasonal variations of methane on

“We don’t have seasonal variations in many molecules in Earth’s atmosphere, so to have a planet have seasonal variations in chemistry is very otherworldly,” says Eigenbrode. “It’s an astounding observation.”

Webster and his colleagues suspect that the methane comes from deep underground, and temperature swings on Mars’s surface throttle its flow upward. In the winter, the gas could get trapped underground in icy crystals called clathrates, which may melt in the summer and free the gas.

But what’s making the methane? Nobody knows.

“We really can’t tell if this methane we see today is a current product of serpentinization [a chemical reaction between iron-bearing rocks and liquid water] or microbial activity at some depth,” says Michael Mumma, the NASA Goddard scientist who discovered Mars’s methane plumes. “Or is it something that is stored from an ancient time that’s being slowly released?”

Still Looking for Life

Experts have hailed the two new studies as milestones for astrobiology.

“It’s incredibly exciting, because it shows that Mars is an active planet today,” says Caltech planetary scientist Bethany Ehlmann, a Mars expert who wasn’t involved with the studies. “It’s not cold and dead—it’s perhaps hovering right on the edge of habitability.”

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From its blood-like hue to its potential to sustain life , Mars has intrigued humankind for thousands of years. Learn how the red planet formed from gas and dust and what its polar ice caps mean for life as we know it.

NASA's Curiosity rover has previously found organic matter on Mars . A smaller discovery was announced in 2014. That doesn't mean life , but organic compounds are the building blocks of life ," he added.

But Webster and others stress that the studies themselves aren't evidence for life on Mars: “The observations we see do not rule out the possibility of biological activity, [but] it’s not a smoking gun for it.”

To get firmer answers, researchers will need to get equipment to Mars that’s sensitive enough to detect life’s thumb on the chemical scales. On Earth, life makes more methane and less of the gas ethane than non-living reactions do. If researchers saw this signature on Mars, the case for life would get stronger.

Future missions will help. The European Space Agency's ExoMars spacecraft, due to land in 2020, will be able to drill more than six feet down into pristine martian soils and examine samples with its on-board suite of instruments. And NASA’s scheduled Mars 2020 rover is slated to package soil samples for future missions to pick up and return to Earth.

Even now, the ExoMars mission is making strides. The mission's Trace Gas Orbiter arrived at Mars in late 2016, and it’s currently collecting data that will let scientists map Mars’s methane—and maybe even pinpoint its sources.

“We just a few weeks ago started our measurements in the most sensitive mode, and the teams are working hard on extracting the data on methane,” Håkan Svedhem, the project scientist for the Trace Gas Orbiter, says in an email. “We believe we will be able to present results on this in a few weeks’ time.”

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