Feeds

Boffin talks WATER on MARS: Granted, no 'smoking gun', but all clues flow there...

Water, water, might be everywhere, but we can't spot it

Intelligent flash storage arrays

Images of dark markings on the surface of Mars that appear to flow as the planet experiences seasonal changes have given boffins the strongest indication of possible liquid water on the planet, but it's proving difficult to come up with conclusive proof.

Dark, seasonal flows at Palikir Crater on Mars snapped by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.

The dark streaks that appear and disappear on the Red Planet, which the scientists refer to as "recurring slope lines" (RSL), are being studied for the minerals they might leave in their wake that could prove one way or another if they're water-related.

"We still don't have a smoking gun for existence of water in RSL, although we're not sure how this process would take place without water," said Lujendra Ojha, a graduate student at the Georgia Institute of Technology and lead author of two new reports about these flows.

Ojha originally discovered the lines in images from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter and has since been analysing 13 confirmed RSL sites with images from the MRO's Compact Reconnaissance Imaging Spectrometer for Mars (CRISM).

But so far, Ojha and his team haven't been able to find any spectral signature related to water or salts. What they did find was distinct and consistent signatures of ferric and ferrous minerals at most of the sites.

"Just like the RSL themselves, the strength of the spectral signatures varies according to the seasons. They're stronger when it's warmer and less significant when it's colder," Ojha said.

These minerals could be left behind in a sorting of grain size process that removes fine dust from the surface, but that could be either a wet process or a dry one. It's also possible that the signatures are an increase in the more oxidised component of the minerals or an overall darkening due to moisture, both of which point to the presence of water.

But scientists can't be sure. The leading hypothesis for RSL is the flow of near-surface water, kept liquid by salts that are depressing the freezing point. CRISM could have missed the water because the dark flows are so much narrower than the area the instrument samples with each reading or it could be because the observations were made in the afternoons, missing morning moisture.

In related research, boffins used the MRO and NASA's Mars Odyssey orbiter to look for patterns in where and when the seasonal flows pop up, but only found 13 confirmed sites out of 200 ideal locations for RSL formation.

"The fact that RSL occur in a few sites and not others indicates additional unknown factors such as availability of water or salts may play a crucial role in RSL formation," Ojha said.

The RSL are also more abundant in some years than in others, making them harder to track.

"NASA likes to 'follow the water' in exploring the Red Planet, so we'd like to know in advance when and where it will appear," said Georgia Tech assistant professor James Wray. "RSL have rekindled our hope of accessing modern water, but forecasting wet conditions remains a challenge." ®

Providing a secure and efficient Helpdesk

More from The Register

next story
MARS NEEDS WOMEN, claims NASA pseudo 'naut: They eat less
'Some might find this idea offensive' boffin admits
SECRET U.S. 'SPACE WARPLANE' set to return from SPY MISSION
Robot minishuttle X-37B returns after almost 2 years in orbit
LOHAN crash lands on CNN
Overflies Die Welt en route to lively US news vid
You can crunch it all you like, but the answer is NOT always in the data
Hear that, 'data journalists'? Our analytics prof holds forth
Experts brand LOHAN's squeaky-clean box
Phytosanitary treatment renders Vulture 2 crate fit for export
No sail: NASA spikes Sunjammer
'Solar sail' demonstrator project binned
America's super-secret X-37B plane returns to Earth after nearly TWO YEARS aloft
674 days in space for US Air Force's mystery orbital vehicle
Carry On Cosmonaut: Willful Child is a poor taste Star Trek parody
Cringeworthy, crude and crass jokes abound in Steven Erikson’s sci-fi debut
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Cloud and hybrid-cloud data protection for VMware
Learn how quick and easy it is to configure backups and perform restores for VMware environments.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.