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$2.5B USD rover's next objective is to probe streambed for water, organics

While the U.S. National Aeronautics and Space Administration's (NASA) human-manned space-travel efforts have stalled in recent years, the agency has enjoyed a relatively strong string of successes with unmanned exploration of Mars.

I. Take me to the River

The latest in a string of robotic explorers has achieved an important milestone -- NASA's Curiosity rover has observed first had one of the dried up stream beds that NASA scientists long speculated existed.  

While past NASA rovers had found signs of water, they did not observe a definitive streambed -- until now.

By imaging the pebbles in the streambed, which were smoothed by the current and cemented into conglomerate rocks, researchers were able to derive in startling detail how the Martian stream likely looked.

A picture of the streambed taken by Curiosity (left), compared to a terrestrial stream bed (right). [Image Source: NASA/JPL]

University of California, Berkley professor and Curiosity science co-investigator William Dietrich elaborates, "From the size of gravels it carried, we can interpret the water was moving about 3 feet per second, with a depth somewhere between ankle and hip deep.  Plenty of papers have been written about channels on Mars with many different hypotheses about the flows in them. This is the first time we're actually seeing water-transported gravel on Mars. This is a transition from speculation about the size of streambed material to direct observation of it."

II. An Odd Location

The streambed lies within the floor of the Gale Crater, in which Curiosity is currently puttering about.  The rover's find lies on the north rim, the deepest part of the unusual crater; with elevation reach over 4,000 ft. below Martian "sea level" (defined as the average elevation around the equator).

What makes the crater so unusual -- and a key reason why NASA landed Curiosity nearby -- is the presence of a massive mountain at the crater's center, named Mount Sharp (formally Aeolis Mons).  Mount Sharp is 5.5 km (18,000 ft.) high -- make it three times as tall as the Grand Canyon is deep.  

Aeolis Mons
Aeolis Mons (aka. "Mt. Sharp") [Image Source: NASA/JPL]

Most craters are created by collisions with extraplanetary objects.  But the presence of the inner mountain suggests some sort of erosion process gave birth to the crater, making a promising target for water.

And indeed, stretching down the northern rim towards the central mountain was a streambed.  Images indicate that a channel named Peace Vallis brought water from outside the crater into a so-called "alluvial-fan" -- a fan shape arrangement of smaller streams.  NASA said the presence of the fan indicates the stream was active for a long period of time.

Rebecca Williams a researcher at the Planetary Science Institute in Tucson, Arizona and member of the Curiosity team, comments, "The shapes tell you they were transported and the sizes tell you they couldn't be transported by wind. They were transported by water flow."

III.  Rover Prepares to Dig for Water, Organics

The success comes after the NASA rover used its telephoto camera to examine a couple of outcroppings -- "Hottah" and "Link" during the first 40 days of its mission.  Remarks Mars Science Laboratory Project Scientist John Grotzinger of the California Institute of Technology (CalTech) in Pasadena, Calif., "Hottah looks like someone jack-hammered up a slab of city sidewalk, but it's really a tilted block of an ancient streambed."

Now the rover gets to use its 10 instruments to try to examine the chemical composition of the sediment that binds the pebbles together.  The rover is equipped with four spectrometers, including an alpha particle X-ray spectrometer (APXS) and an X-ray powder diffraction and fluorescence module dubbed Chemical and Mineralogy (CheMin).

The $2.5B USD robot is equipped with advanced tools to hunt for water and organics and survive the hostile Martian environment. [Image Source: NASA/JPL]

The best may yet lie ahead for the rover, though.  It is equipped with Dynamic Albedo of Neutrons (DAN) device to try to spot hydrogen or ice/water at the surface of the streambed.  Researchers also hope to possibly find carbon-rich organic molecules on the lower slopes of the mountain.

Images showed the mountain to be rich in sulfate and clay deposits, which researchers hypothesize could preserve organic molecules in the harsh Martin climate.  Potential organics will be examined with the Sample Analysis at Mars (SAM) package, which consists of a Quadruple Mass Spectrometer (QMS) and a gas chromatograph (GC).

Prof. Grotzinger hints at his team's hope of discovering signs of life, commenting, "A long-flowing stream can be a habitable environment.  It is not our top choice as an environment for preservation of organics, though. We're still going to Mount Sharp, but this is insurance that we have already found our first potentially habitable environment."

The discovery is also useful as it offers evidence reaffirming the long-held notion that Mars could be made habitable/semi-habitable if its ice caps were melted and its atmosphere rebuilt.

IV. A Third Generation Design

The Curiosity mission was preceded by the 2003 Mars Exploration Rover Mission (MER) -- a mission which featured the six-wheeled solar-powered robots Spirit and Opportunity.  The 1997 Mars Pathfinder and its Sojourner rover, a far tinier six-wheeled solar-powered design, preceded that mission.  Sojourner was the first rover to operate on Mars.

Curiosity is bigger than the mid-size MER rovers and the tiny Sojourner rover.  NASA used the lessons learned from its predecessors' malfunctions, along with modern electronics to produce a more rugged, robust, and function design, the third time around.

NASA first reached Martian orbit with the Mariner probes in the mid-1960s, as did the Soviets with their Mars series of fly-by probes.  The first spacecraft to land on Mars was NASA's 1975 Viking lander.

NASA rovers
Curiosity (right) is NASA's third rover design, following the tiny 1997 Sojourner (front/center) and 2003's twin rovers Spirit and Opportunity. [Image Source: NASA/JPL]

It took Curiosity just under 9 months to reach the red planet, slightly longer than its predecessor MER, which took seven months.  Reaching the red planet isn't cheap, despite NASA's experience.  

The Pathfinder mission cost around $150M USD, the MER cost roughly $950M USD of which roughly eight-ninths went towards the construction, launch, with the remainder going towards operating the twin rovers.  Curiosity was even more of a pricier beast.  NASA spent $2.5B USD, struggling with cost overruns before it finally launched the ambitious design to the skies.

Source: JPL

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What a wonderful age we live in...
By LBID on 9/28/2012 2:19:38 PM , Rating: 2
With all of the terrible things that happen in the world, it's easy to lose track of miracles like this. We're exploring other freakin' planets, for goodness' sake! I don't have my personal helicopter yet, but I'm holding out for that at Christmas.

By RufusM on 9/28/2012 2:54:32 PM , Rating: 2
I think this is it:

I've wanted one of these death traps since I was a child.

By Jeffk464 on 9/30/2012 10:06:30 PM , Rating: 2

If you don't mind having a cuisinart next to your head.

By ssj3gohan on 10/1/2012 7:00:34 AM , Rating: 2
I say this so often: we're living in the future! It's all happening, right now!

By CityZen on 9/28/2012 2:17:58 PM , Rating: 3
Loved the pic showing the evolution of the Martian Rovers

RE: Rovers
By kattanna on 10/1/2012 11:47:47 AM , Rating: 2
yep, its funny seeing how small the first one really was.

By Ammohunt on 9/28/2012 2:24:45 PM , Rating: 3
The images coming back from Curiosity are amazing! To bad they didn't include a ground penetrating radar so we could see underground.

RE: Awesome
By JKflipflop98 on 9/29/2012 8:58:44 PM , Rating: 2
GPR is kind of chunky to be sent up with this one, but that's a great idea for the basis of another rover! Just come up with a DOE that throws a couple other related instruments in there and you may have just designed the next Mars mission.

By geddarkstorm on 9/28/2012 2:49:50 PM , Rating: 1
Where there be streams, there be gold! Gold! Nuggets the size of your fist!


It sure would be amusing if Curiosity's chemlab did identify gold and sparked an interplanetary rush (not likely, as the value of the gold would be a lot less than the cost of going to and from Mars; but that defeats comedic purposes).

This is pretty fantastic. There must indeed be a lot of water under that little red planet's surface as we've thought for the past decades. Prospects of productive colonization just went way up.

RE: Gold!
By Reclaimer77 on 9/28/12, Rating: 0
RE: Gold!
By geddarkstorm on 9/28/2012 3:59:56 PM , Rating: 2
Well in that case... Mars or bust, buddy!

RE: Gold!
By bobogo2013 on 9/29/2012 2:46:21 AM , Rating: 2
Johnny 5 is alive!! Where's my Obama phone!?

Johnny 5 will be number 10 of the Obama Boyz Crew!! Phone now!!

mountain names
By MadMan007 on 9/29/2012 8:29:38 AM , Rating: 2
I like the old names for Mars features better. Aeolis Mons sounds so much cooler than Mount Sharp.

RE: mountain names
By ssj3gohan on 10/1/2012 7:03:23 AM , Rating: 2
It's exactly the same, just a different language.

Nasa owns.
By JKflipflop98 on 9/29/2012 8:56:34 PM , Rating: 3
NASA is one of the few American institutions that I can feel pride knowing they're part of our country. These guys are amazing, and they've certainly been an inspiration to me throughout my entire life.

Thanks, NASA!

Isn't it obvious
By Totally on 9/30/2012 2:32:40 PM , Rating: 2
It isn't a mountain, it's a Geyser or what used to be. Since there are significant since of volcanic formation water rising to the surface from an underground source would have the same effect.

Maybe it isn't water.
By drycrust3 on 9/30/2012 3:19:16 PM , Rating: 2
While past NASA rovers had found signs of water, they did not observe a definitive streambed -- until now.

I've been thinking about this, and it seems to me that almost any reasonable fluid that could exist in the Martian climate could have produced this result. Since there is no obvious dating mechanism bar the amount of dust on surface, this stream bed could have just as easily be made 10 years ago as 10,000 years ago. Looking at the thin layer of dust on the pebbles, I would suspect a more recent date than a older date.
According to Wikipedia, the Martian atmosphere has a mean surface pressure about 0.6% that of earth at sea level, and the temperatures are around 210 Kelvin. The Wikipedia entry on Martian climate suggests a mean temperature of -55C, i.e. 218K.
Because of the thin atmosphere, it may be that even if the Martian temperature did, on the rare occasion, get above 273K - 0C, water may not actually exist as a liquid on Mars because it would immediately boil off and become a gas.
Carbon dioxide is the main constituent of the Martian atmosphere. It has a melting point of 194K (-78C, -109F), and, using an atmospheric pressure of 5.185 bars (5 times earth's air pressure), has a boiling point of 216K (-57C, -70F), meaning the window of opportunity for liquid CO2 to exist on its own on Mars is almost non-existent.
Looking at the melting and boiling points of some of other the different Martian gases, it seems to me another remotely possible contender is Formaldehyde (CH2O), which is present in minute amounts in the atmosphere, but has a melting point of 181K (-92C, -134F) and a boiling point (at 100KPa - earth sea level pressure) of 254K (-19C, -2F).
Thus, it may be that either early in its life Mars did, for a short while, have a climate that included liquid water; or that some sort of combination of chemicals e.g. a carbon dioxide - formaldehyde mix, forms as a liquid on rare occasions in sufficient quantities so as to create streams.

By MartyLK on 10/1/2012 10:09:20 AM , Rating: 2
Stuff like this is old ham. We know the universe is filled with water. There's even water on our Moon. What we don't know is if there is life elsewhere. That is something I wait patiently to know about. Let NASA find evidence for life and make it known. A stream bed does nothing to help answer the question of the extraterrestrial existence of life.

No Unit Issue
By punko on 9/28/12, Rating: 0
RE: No Unit Issue
By ClownPuncher on 9/28/2012 2:47:51 PM , Rating: 1
Maybe "Red giant" is being used as an endearing term, rather than scientific.

"Death Is Very Likely The Single Best Invention Of Life" -- Steve Jobs

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