Martian Nahkla meteorite yields more evidence of Life

The finding of a 'cell-like' structure, which investigators now know once held water, came about as a result of collaboration between scientists in the UK and Greece.

Their findings are published in the latest edition of the journal Astrobiology.

While investigating the Martian meteorite, known as Nakhla, Dr Elias Chatzitheodoridis of the National Technical University of Athens found an unusual feature embedded deep within the rock.

In a bid to understand what it might be, he teamed up with long-time friend and collaborator Professor Ian Lyon at the University of Manchester.

Professor Lyon, based in Manchester's School of Earth, Atmospheric and Environmental Sciences (SEAES) explains: "In many ways it resembled a fossilized biological cell from Earth but it was intriguing because it was undoubtedly from Mars.

Our research found that it probably wasn't a cell but that it did once hold water, water that had been heated, probably as a result of an asteroid impact."

Elias Chatzitheodoridis

These findings are significant because they add to increasing evidence that beneath the surface, Mars does provide all the conditions for life to have formed and evolved.

It also adds to a body of evidence suggesting that large asteroids hit Mars in the past and produce long-lasting hydrothermal fields that could sustain life on Mars, even in later epochs, if life ever emerged there.

Sarah Haigh

As part of the research, the feature was imaged in unprecedented detail by Dr Sarah Haigh of The University of Manchester whose work usually involves high resolution imaging for next generation electronic devices, which are made by stacking together single atomic layers of graphene and other materials with the aim of making faster, lighter and bendable mobile phones and tablets.

A similar imaging approach was able to reveal the atomic layers of materials inside the meteorite.

Together their combined experimental approach has revealed new insights into the geological origins of this fascinating structure.

Ian Lyon

Professor Lyon said: "We have been able to show the setting is there to provide life. It's not too cold, it's not too harsh. Life as we know it, in the form of bacteria, for example, could be there, although we haven't found it yet."

"It's about piecing together the case for life on Mars, it may have existed and in some form could exist still."

Now, the team is using these and other state-of-the-art techniques to investigate new secondary materials in this meteorite and search for possible bio signatures which provide scientific evidence of life, past or present.

Professor Lyon concluded: "Before we return samples from Mars, we must examine them further, but in more delicate ways. We must carefully search for further evidence."

More information: "A Conspicuous Clay Ovoid in Nakhla: Evidence for Subsurface Hydrothermal Alteration on Mars with Implications for Astrobiology." Elias Chatzitheodoridis, Sarah Haigh, Ian Lyon. Astrobiology. August 2014, 14(8): 651-693. online.liebertpub.com/doi/pdfp… 0.1089/ast.2013.1069

Meteorites yield clues to Martian early atmosphere - Sulphur

A microscope reveals colorful augite crystals in this 1.3 billion-year-old meteorite from Mars, which researchers studied to understand the red planet's atmospheric history. 

Credit: James Day

Geologists who analyzed 40 meteorites that fell to Earth from Mars unlocked secrets of the Martian atmosphere hidden in the chemical signatures of these ancient rocks.

Their study, published April 17 in the journal Nature, shows that the atmospheres of Mars and Earth diverged in important ways very early in the 4.6 billion year evolution of our solar system.

The results will help guide researchers' next steps in understanding whether life exists, or has ever existed, on Mars and how water—now absent from the Martian surface—flowed there in the past.

Heather Franz

Heather Franz, a former University of Maryland (UMD) research associate who now works on the Curiosity rover science team at the NASA Goddard Space Flight Center, led the study with James Farquhar, co-author and UMD geology professor.

The researchers measured the sulfur composition of 40 Mars meteorites—a much larger number than in previous analyses. Of more than 60,000 meteorites found on Earth, only 69 are believed to be pieces of rocks blasted off the Martian surface.

The meteorites are igneous rocks that formed on Mars, were ejected into space when an asteroid or comet slammed into the red planet, and landed on Earth.

James Farquhar

The oldest meteorite in the study is about 4.1 billion years old, formed when our solar system was in its infancy. The youngest are between 200 million and 500 million years old.

Studying Martian meteorites of different ages can help scientists investigate the chemical composition of the Martian atmosphere throughout history, and learn whether the planet has ever been hospitable to life.

Mars and Earth share the basic elements for life, but conditions on Mars are much less favourable, marked by an arid surface, cold temperatures, radioactive cosmic rays, and ultraviolet radiation from the Sun.

Still, some Martian geological features were evidently formed by water – a sign of milder conditions in the past.

Scientists are not sure what conditions made it possible for liquid water to exist on the surface, but greenhouse gases released by volcanoes likely played a role.

Sulphur, which is plentiful on Mars, may have been among the greenhouse gases that warmed the surface, and could have provided a food source for microbes.

Because meteorites are a rich source of information about Martian sulphur, the researchers analyzed sulfur atoms that were incorporated into the rocks.

In the Martian meteorites, some sulphur came from molten rock, or magma, which came to the surface during volcanic eruptions.

Volcanoes also vented sulphur dioxide into the atmosphere, where it interacted with light, reacted with other molecules, and settled on the surface.

The team's work has yielded the most comprehensive record of the distribution of sulphur isotopes on Mars.

In effect, they have compiled a database of atomic fingerprints that provide a standard of comparison for sulphur-containing samples collected by NASA's Curiosity rover and future Mars missions.

This information will make it much easier for researchers to zero in on any signs of biologically produced sulphur, Farquhar said.

More information: Isotopic links between atmospheric chemistry and the deep sulphur cycle on Mars, Nature, DOI: 10.1038/nature13175

ESA's Mars Express: Huge Martian Landforms Detail Revealed

ESA's Mars Express orbited the Red Planet nearly 12,500 times by October 2013. Its high resolution stereo camera images, assembled in this "fly-around," show riverbeds, volcanoes, canyons and craters.

Credit: ESA / DLR / FU Berlin (G. Neukum)

Mars Rover Opportunity Reaches Campsite for Martian Winter

NASA's Opportunity Mars rover used its navigation camera to record this image of the northern end of "Solander Point," a raised section of the western rim of Endeavour Crater, on Aug. 8, 2013.

Credit: NASA/JPL-Caltech

NASA's long-lived Opportunity Mars rover has reached the site where it will wait out its sixth Red Planet winter.

Opportunity — which touched down on Mars in January 2004 just after its twin, Spirit, arrived on the planet — is studying rocks at the foot of a location called Solander Point, whose north-facing slope will allow the robot to tilt its solar panels toward the sun during the coming southern Martian winter.

"We made it," Opportunity project scientist Matt Golombek, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., said in a statement. "The drives went well, and Opportunity is right next to Solander Point."

"We know we could be on that north-facing slope with a one-day drive, but we don't need to go there yet. We have time to investigate the contact between the two geological units around the base of Solander Point."



One of those two units preserves evidence of long-ago contact with acidic water, while the other one is older and may contain minerals that formed in more neutral and benign liquid water, researchers said.

The Opportunity rover arrived at the base of Solander Point in the first few days of August, after a three-month, 1.5-mile (2.4 kilometers) journey from a spot called Cape York.

Both Solander Point and Cape York sit along the rim of the 14-mile-wide (22 km) Endeavour Crater, which Opportunity reached in August 2011.

The days are getting shorter in Mars' southern hemisphere, and the amount of sunlight available to the solar-powered Opportunity will reach a minimum in mid-February 2014 (the southern winter solstice occurs on Feb. 14).

NASA Mars Opportunity discovers clays favourable to Martian biology

The pale rock in the upper center of this image, about the size of a human forearm, includes a target called “Esperance,” which was inspected by NASA’s Mars Exploration Rover Opportunity.

Data from the rover’s alpha particle X-ray spectrometer (APXS) indicate that Esperance’s composition is higher in aluminum and silica, and lower in calcium and iron, than other rocks Opportunity has examined in more than nine years on Mars. 

Preliminary interpretation points to clay mineral content due to intensive alteration by water. 

Credit: NASA/JPL-Caltech/Cornell/Arizona 

Now nearly a decade into her planned 3 month only expedition to Mars, NASA's longest living rover Opportunity, struck gold and has just discovered the strongest evidence to date for an environment favourable to ancient Martian (organic) biology – and she has set sail hunting for a motherlode of new clues amongst fabulous looking terrain.

Barely two weeks ago in mid-May 2013, Opportunity's analysis of a new rock target named "Esperance" confirmed that it is composed of a "clay that had been intensely altered by relatively neutral pH water – representing the most favorable conditions for biology that Opportunity has yet seen in the rock histories it has encountered," NASA said in a statement.

The finding of a fractured rock loaded with clay minerals and ravaged by flowing liquid water in which life could have thrived amounts to a scientific home run for the golf cart sized rover!

"Water that moved through fractures during this rock's history would have provided more favorable conditions for biology than any other wet environment recorded in rocks Opportunity has seen," said the mission's principal investigator Prof. Steve Squyres of Cornell University, Ithaca, N.Y.

Opportunity accomplished the ground breaking new discovery by exposing the interior of Esperance with her still functioning Rock Abrasion Tool (RAT) and examining a pristine patch using the microscopic camera and X-Ray spectrometer on the end of her 3 foot long robotic arm.

The robot made the discovery at the conclusion of a 20 month long science expedition circling around a low ridge called "Cape York" – which she has just departed on a southerly heading trekking around the eroded rim of the huge crater named "Endeavour."

"Esperance was so important, we committed several weeks to getting this one measurement of it, even though we knew the clock was ticking."

Esperance stems from a time when the Red Planet was far warmer and wetter billions of years ago.

Close-Up of ‘Esperance’ After Abrasion by Opportunity 

This mosaic of four frames shot by the microscopic imager on the robotic arm of NASA’s Mars Exploration Rover Opportunity shows a rock target called “Esperance” after some of the rock’s surface had been removed by Opportunity’s rock abrasion tool, or RAT. 

The component images were taken on Sol 3305 on Mars (May 11, 2013). 

The area shown is about 2.4 inches (6 centimeters) across. 

Credit: NASA/JPL-Caltech/Cornell/USGS

NASA Curiosity Rover Collects First Martian Bedrock Sample

At the center of this image from NASA's Curiosity rover is the hole in a rock called "John Klein" where the rover conducted its first sample drilling on Mars. 

The drilling took place on Feb. 8, 2013, or Sol 182, Curiosity's 182nd Martian day of operations. 

Several preparatory activities with the drill preceded this operation, including a test that produced the shallower hole on the right two days earlier, but the deeper hole resulted from the first use of the drill for rock sample collection. Image credit: NASA/JPL-Caltech/MSSS.

NASA's Curiosity rover has, for the first time, used a drill carried at the end of its robotic arm to bore into a flat, veiny rock on Mars and collect a sample from its interior. This is the first time any robot has drilled into a rock to collect a sample on Mars.

The fresh hole, about 0.63 inch (1.6 centimeters) wide and 2.5 inches (6.4 centimeters) deep in a patch of fine-grained sedimentary bedrock, can be seen in images and other data Curiosity beamed to Earth Saturday. The rock is believed to hold evidence about long-gone wet environments. In pursuit of that evidence, the rover will use its laboratory instruments to analyze rock powder collected by the drill.

"The most advanced planetary robot ever designed is now a fully operating analytical laboratory on Mars," said John Grunsfeld, NASA associate administrator for the agency's Science Mission Directorate. "This is the biggest milestone accomplishment for the Curiosity team since the sky-crane landing last August, another proud day for America."

For the next several days, ground controllers will command the rover's arm to carry out a series of steps to process the sample, ultimately delivering portions to the instruments inside.

"We commanded the first full-depth drilling, and we believe we have collected sufficient material from the rock to meet our objectives of hardware cleaning and sample drop-off," said Avi Okon, drill cognizant engineer at NASA's Jet Propulsion Laboratory, Pasadena, Calif.

Rock powder generated during drilling travels up flutes on the bit. The bit assembly has chambers to hold the powder until it can be transferred to the sample-handling mechanisms of the rover's Collection and Handling for In-Situ Martian Rock Analysis (CHIMRA) device.

Before the rock powder is analyzed, some will be used to scour traces of material that may have been deposited onto the hardware while the rover was still on Earth, despite thorough cleaning before launch.

"We'll take the powder we acquired and swish it around to scrub the internal surfaces of the drill bit assembly," said JPL's Scott McCloskey, drill systems engineer. "Then we'll use the arm to transfer the powder out of the drill into the scoop, which will be our first chance to see the acquired sample."

"Building a tool to interact forcefully with unpredictable rocks on Mars required an ambitious development and testing program," said JPL's Louise Jandura, chief engineer for Curiosity's sample system. "To get to the point of making this hole in a rock on Mars, we made eight drills and bored more than 1,200 holes in 20 types of rock on Earth."

Inside the sample-handling device, the powder will be vibrated once or twice over a sieve that screens out any particles larger than six-thousandths of an inch (150 microns) across. Small portions of the sieved sample will fall through ports on the rover deck into the Chemistry and Mineralogy (CheMin) instrument and the Sample Analysis at Mars (SAM) instrument. These instruments then will begin the much-anticipated detailed analysis.

The rock Curiosity drilled is called "John Klein" in memory of a Mars Science Laboratory deputy project manager who died in 2011. Drilling for a sample is the last new activity for NASA's Mars Science Laboratory Project, which is using the car-size Curiosity rover to investigate whether an area within Mars' Gale Crater has ever offered an environment favorable for life.

Scientists hope to find Life on Mars it by decoding Martian DNA

There are not enough genomes for Craig Venter to sequence here on Earth, so he's making plans to send a DNA sequencer to Mars.

"There will be life forms there," Venter said, with his usual confidence, at a Wired Health conference this week in New York.

If he can build a machine to find it, the next steps would be to decode its DNA, beam it back to Earth, put those genetic instructions into a cell and then boot up a Martian life form in a biosecure lab.

Assuming that there is DNA to be found on the Red Planet, the notion of equipping a future Mars rover to sequence the DNA isn't so crazy.

Venter has already sent his yacht around the globe to scoop up seawater and sequence whatever DNA it found in marine microbes.

He has also been working on technology to create small genomes from scratch and insert them into living cells to bring these organisms to life.

The difference now is that all of this technology would be applied to Mars. It's highly unlikely that any DNA-based life forms could survive on the Martian surface, so Venter's "biological teleporter" would dig under the surface for samples to sequence.

If they find anything, "it would take only 4.3 minutes to get the Martians back to Earth," he said. "Now we can rebuild the Martians in a P4 spacesuit lab."

Venter isn't the only one looking for Martian DNA. According to a report in the MIT Technology Review, so is Jonathan Rothberg, founder of the genome sequencing company Ion Torrent.

Rothberg is working with NASA-funded scientists from the Massachusetts Institute of Technology and Harvard to adapt his company's Personal Genome Machine for use on Mars, the report says.

It's part of a NASA astrobiology project known as the Search for Extra-Terrestrial Genomes, or SETG.

MIT research scientist Christopher Carr is part of a group that's "building a miniature RNA/DNA sequencer to search for life beyond Earth," according to his website.

"Top places to look include Mars, Enceladus (a moon of Saturn), and Europa (a moon of Jupiter)." Carr told Tech Review that one of the biggest challenges is shrinking Ion Torrent's 30-kilogram machine down to a mere 3 kg - light enough to fit on a Mars rover.

That's just one of the hurdles. NASA has no firm plans for a rover to succeed Curiosity, the lab-on-wheels that reached the Red Planet in August.

Even if a new rover gets the green light, there's no guarantee that a gene sequencer would get one of the coveted spots for research instruments.

Tissint meteorite fragment may contain Martian gas.

A fragment of the Tissint meteorite. Regions of black glass are thought to contain gas, rock and traces of Martian soil. 

Photograph: Natural History Museum, London

A lump of space rock that shattered the predawn calm of the Moroccan desert with a fireball and double sonic boom last year was knocked off Mars in a cosmic collision roughly 700,000 years ago.

The date of the Martian impact means the rock was flung into space and began its journey to Earth when the shared ancestor of modern humans and Neanderthals was still alive and well in Africa.

Scientists dated the collision through a fresh analysis of the remains of the meteorite, based on the exposure of its elements to intense cosmic rays during its journey through space.

The Tissint meteorite, as it is known, is particularly valuable because it was recovered before it had suffered any weathering on Earth.

Witnesses said it split in two as it fell to Earth and landed in the desert near Tata, south-east Morocco, at 2am local time on 18 July last year.

Pieces weighing between 100g and 2kg have been recovered, along with thousands of smaller fragments. The intact meteorite is estimated to have weighed 17kg.

Researchers at the Hassan II University of Casablanca found regions of black glass inside the meteorite that are thought to contain gas, rock and traces of Martian soil.

Hasnaa Chennaoui Aoudjehane

"What is really exciting in this meteorite is that it has this black glass trapped inside," said Hasnaa Chennaoui Aoudjehane, who worked on the specimen.

Further analysis of the glass and the gas locked up in its tiny bubbles may help scientists reconstruct the conditions on Mars when the rock was blasted into space.

"Those bubbles are interesting because they trapped Martian conditions at the moment the meteorite formed, and it hasn't had any exchange with other materials," Chennaoui Aoudjehane said.

The research appears in the latest issue of Science.

ESA: Phobos and Deimos, Martian Moon Duo, in alignment

Phobos and Deimos raw (left panel) and processed images (right panel). Phobos rests in the foreground of the image with Deimos behind. Deimos was more than twice as far from the camera.

Credit: ESA/DLR/FU Berlin (G. Neukum).

For the very first time, the Martian moons Phobos and Deimos have been caught on camera together. ESA's Mars Express orbiter took these pioneering images last month. Apart from their 'wow' factor, these unique images will help the HRSC team validate and refine existing orbit models of the two moons.

The images were acquired with the Super Resolution Channel (SRC) of the High Resolution Stereo Camera (HRSC). The camera took 130 images of the moons on 5 November at 9:14 CET over period of 1.5 minutes at intervals of 1s, speeding up to 0.5-s intervals toward the end. The image resolution is 110 m/pixel for Phobos and 240 m/pixel for Deimos - Deimos was more than twice as far from the camera.

The Super Resolution Channel of the HRSC uses an additional lens, which has a very narrow field of view of just 0.5 degree, providing four times the resolution of the HRSC color stereo channel.

Phobos, the larger of the two moons, orbits closer to the Red Planet, circling it every 7 hours and 39 minutes. It travels faster relative to Mars than the Moon relative to Earth. It was 11,800 km from Mars Express when the images were taken. Deimos was 26,200 km away.

It is not often that both Martian moons are located directly in front of the camera, lined up one behind the other. The chance to image both moons together came on 5 November 2009 when the viewing geometry was especially favorable.

The plan to image both moons at once was years in the making and was made possible by the unique elliptical orbit of Mars Express, precise knowledge of the orbits of the planet, the moons and the spacecraft, as well as fortuitous viewing geometry, and perfect planning by the ESA and HRSC teams.

Exploration of Phobos: A Scientific Priority for Mars Express
In addition to producing high-resolution maps of the surface of Mars in color and in 3D, the exploration of Phobos is a scientific priority for the HRSC team. The potato-shaped, 27 × 22 × 18 km moon has already been photographed 127 times by the HRSC, improving our knowledge of the topography of the moon, and providing insight into its origins and development.

The moons of Mars still hold many mysteries. Phobos is made of dark material that does not reflect much light, and some scientists suspect it has a chemical composition similar to that of carbonaceous chondrite asteroids.

Phobos may also contain water ice, which could be an important resource for future Mars explorers. As missions like Mars Express continue to observe Phobos and Deimos, scientists hope to reveal more information about these unique satellites of Mars.