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gravetti
09-26-2015, 04:06 PM
http://www.nasa.gov/press-release/nasa-to-announce-mars-mystery-solved

NASA will detail a major science finding from the agency’s ongoing exploration of Mars during a news briefing at 11:30 a.m. EDT on Monday, Sept. 28 at the James Webb Auditorium at NASA Headquarters in Washington. The event will be broadcast live on NASA Television and the agency's website.

DMXX
09-26-2015, 04:20 PM
Looking forward to this. The microbial life forms on Mars report was dubious, and we've received enough confirmation of groundwater existing in the planet's poles. There's only so many remaining mysteries... The existence of past (or present?) life there is still the biggest.

(Although some of us Transformers fans knew they couldn't hide the truth forever...)


https://upload.wikimedia.org/wikipedia/commons/7/77/Martian_face_viking_cropped.jpg
http://www.tfw2005.com/boards/attachments/transformers-toy-discussion/27321297d1348190367-best-representation-g1-megatron-de131fe7bafe481cbf7b2e9373889f7a.jpg

Piquerobi
09-28-2015, 04:33 PM
Evidence of liquid water found on Mars


Scientists say they have found evidence of freshly flowing water on the surface of Mars - but caution that there is a "long way to go" before they can say if the Red Planet could support life.

Chemical analysis of dark streaks on the surface of the planet has identified the presence of hydrated salts that are the signature of liquid salty water.

"We can safely say that some sort of liquid water activity is involved in the formation mechanism of these," researcher Lujendra Ojha of the Georgia Institute of Technology in Atlanta said.

"It's been three years of trial and error to get these readings."

Since the discovery of the dark streaks on Martian slopes over a decade ago, astronomers have debated about what caused the structures, dubbed "recurring slope lineae".

Are they really a sign of flowing water or are they simply caused by dry grains of material rolling down the slopes of a freeze-dried planet surface?

To date, observations have lacked the fine resolution needed to determine the chemical composition of the streaks, which are typically less than five metres wide.

But today, in findings reported in the journal Nature Geoscience, Mr Ojha and colleagues have solved this problem by combining data from two different instruments aboard NASA's Mars Reconnaissance Orbiter spacecraft.

Mr Ojha and colleagues analysed the chemical composition of streaks at four different locations on the Martian surface.

"By using the HiRise visible light camera and the CHRISM spectrometer aboard the same spacecraft, we could look at the same surface and acquire both pictures and ... spectra data to tell us about the chemical information at the same time," Mr Ojha said.

The researchers found hydrated salts, which precipitate from water, on all the streaks they examined.

"We detected magnesium perchlorate, magnesium chlorate and sodium perchlorate," Mr Ojha said.

By contrast, the terrain surrounding the transient streaks lacked any spectral signatures for salts.

Mr Ojha and colleagues argue the range of surface temperatures over which the streaks appear supports the hypothesis that water is seeping down slopes on Mars during warm seasons and drying up when the seasons get colder.

On Mars, water freezes into ice at 0 degrees Celsius, and boils at just 10 degrees Celsius because of relatively low air pressure.

But, said Mr Ojha, water containing salts like sodium perchlorate can stay liquid down to minus 70 degrees Celsius, and will not start boiling until temperatures reach as high as 24 degrees Celsius.

Mr Ojha said the perchlorates were also "hydroscopic".

"They can absorb atmospheric moisture, a really amazing process called deliquescence, where they absorb the water vapour from the atmosphere and create a water flow," he said.

Life on Mars?

Earlier this year NASA's Mars Curiosity discovered calcium perchlorates in the soils of Gale Crater, unrelated to the dark streaks.

Those findings, also reported in Nature Geoscience, indicated that the right temperature and humidity conditions existed in Gale Crater at night and just after sunrise during the Martian winter for moisture in the atmosphere to be absorbed by the salts and potentially form salty liquid water.

Mr Ojha said this new discovery meant some places on Mars were more habitable than previously thought, but that did not mean there was life on Mars.

"We're just starting to scratch the surface about these features, and there's a long way to go before we can safely say it is a habitable place or it has biological potential," Mr Ojha said.

"However, if humanity ever goes to Mars, this is probably an excellent source of water for consumption or rocket fuel."

NASA's planetary science director Jim Green described the discovery as revolutionary.

"Mars is not the dry, arid planet we thought of in the past ... it once had extensive water resources," he said.

"Mars suffered a major climate change and lost its surface water. Today we're revolutionising our understanding of this planet."

Astrophysicist Professor Geraint Lewis of the University of Sydney said the new findings were "critical evidence" for the streaks on Mars having formed by flowing, "or at least dribbling" water.

"This new result bolsters the argument for water on the surface of our planetary companion," he said.

Dr Amanda Bauer from the Australian Astronomical Observatory added: "I can simply say that the potential presence of liquid water on the surface of Mars is incredibly exciting because water is essential for life as we know it to exist.

"More work is needed to understand how exactly these seasonal salty water streams are formed on Mars, but the new evidence for water flow is certainly an exciting step forward in understanding water activity on Mars."
http://www.abc.net.au/news/2015-09-29/evidence-for-liquid-water-found-on-mars/6810080

Afshar
09-29-2015, 06:38 AM
Time to open a carwash on Mars

Gary Corbett
10-01-2015, 01:26 AM
About 6 months from now,they will find Jimmy Hoffa there....

Táltos
10-01-2015, 02:57 AM
http://www.nasa.gov/mission_pages/station/research/news/biomolecule_sequencer Looks like they are preparing to be able to eventually DNA sequence beyond Earth. :)

MikeWhalen
10-01-2015, 11:24 AM
Hey! I hope not, the NFL should expand to Canada before dratted Mars

Mike


About 6 months from now,they will find Jimmy Hoffa there....

Gary Corbett
10-02-2015, 01:04 AM
Umm...what's the NFL got to do with Jimmy Hoffa? :\

DMXX
11-04-2015, 08:13 AM
Another NASA announcement imminent regarding Mars (http://www.nasa.gov/press-release/nasa-to-announce-new-findings-on-fate-of-mars-atmosphere/). This time, some news regarding its' atmosphere.

I'm anticipating they'll reveal there's more water vapour than was previously thought. Mars' predominantly CO2 rich atmosphere has been known for years now.

A more mindblowing finding will be the presence of bacteria in the atmosphere (as in Earth (http://news.sciencemag.org/biology/2013/01/microbes-survive-and-maybe-thrive-high-atmosphere)). Looking forward to this!

miiser
11-04-2015, 08:39 AM
I think water in the atmosphere is a good guess. Following some harsh criticism of the Mars rover program earlier this year, they've managed to come up with a big exciting press release every couple months, each one less exciting than the previous one. Not that these aren't significant mission successes. But there's definitely been a focused effort to play up and highly publicize every little discovery.

DMXX
11-04-2015, 08:44 AM
For me personally, any additional insights regarding our solar system is good news.

But I do agree that, in the grand scheme of things, these aren't particularly mind-blowing. The liquid water announcement some weeks back was somewhat underwhelming (as mentioned earlier, we already had very good reasons for suspecting groundwater in the poles).

miiser
11-04-2015, 10:57 AM
Now that I've taken a closer look at the pre-announcement article, I think it will specifically have to do with where and why Mars' atmosphere disappeared, which has been a mystery for some time. And there was recently this article: https://www.nasa.gov/feature/jpl/what-happened-to-early-mars-atmosphere-new-study-eliminates-one-theory

Maybe this announcement is just a summary conclusion of recent findings regarding what happened to the atmosphere, with maybe some new tidbit of data, such as geologic proof that the magnetic field used to be stronger than it currently is, and the weakening field permitted solar wind to blast away the atmosphere.

MikeWhalen
11-04-2015, 12:12 PM
Hi Gary...I did not see your post when you sent it otherwise I would have responded sooner

Legend has it that Jimmy Hoffa was buried under the end zone during the construction (74-76) of Giant's stadium. Evidently the FBI got a tip off and took it fairly seriously at the time.

Mike


Umm...what's the NFL got to do with Jimmy Hoffa? :\