Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

When seen through the lens of technology, few resources are truly scarce; they’re mainly inaccessible. 

 

Peter Diamandis

Deep Trenches on Mars Aren't What We Thought They Were

RATE THIS! +21
Posted in Science on 31st Jul, 2016 09:18 PM by AlexMuller

The surface of Mars is lined with mysterious deep-carved trenches. A long-standing theory suggesting that the were left long ago by flowing rivers was just debunked. So where did these trenches come from? Researchers at Johns Hopkins have been studying images of the gullies from NASA’s Mars Reconnaissance Orbiter.

 

At first, there was nothing to suggest that they hadn’t been etched out by long-ago rivers, like similar features here on Earth

 
Hoping to get a glimpse of some mineral deposits and clay left behind by the water, researchers overlaid colour composition scans onto existing photographs. But when they looked at their photos, the most recent deposits they could find were small quantities left billions of years ago. There was no sign of the flowing rivers at all.
 
That doesn’t mean that liquid water doesn’t flow in streams on Mars. We know that it does, because we’ve seen it move across the planet’s surface with the changing of the season:
 
What it does mean, however, is that there’s even more evidence to back up a study from earlier this year that suggested water quantities on Mars had long been much sparser than we believed.
 
In that study, researchers showed that we had overestimated the amount of water flowing on the Red Planet due to a single missed fact. Until this year, no one knew that flowing water on Mars also boils on the surface, making it appear to be deeper and more turbulent than it is in reality. While there’s still enough water to flow even today, it’s nothing like the kinds of deep, flowing rivers that would be required to carve out those gullies.
 
That does, however, leave an outstanding question. If not water, what did dig out those deep trenches? Alas, there are no bulldozer-driving aliens behind them. Instead, researchers suspect that the force that dug them out may have been simply, and less dramatically, a carbon dioxide frost freezing and thawing over and over again across millions of years. Their next step is to try and confirm that suspicion.

Tags: Marsspaceplanetastronomyresearch

Read original article » Back to category

Comments



 

Recent headlines

  • Posted in Business on 2017-12-10 21:08:08
    Boeing Believes It Can Beat SpaceX to Mars..read more
    Posted in Hardware on 2017-12-10 20:56:14
    Why Google Is Poised to Hit the Next Critical Milestone.....read more
    Posted in Science on 2017-12-10 20:52:53
    SpaceX Set to Make History Next Week During Supply.....read more
    Posted in Software on 2017-12-09 13:24:52
    An investor’s view of AI in 2018..read more
    Posted in Business on 2017-12-09 13:21:51
    Bitcoin seized by Bulgaria’s government now worth $3.....read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Martian landscapes formed from sand 'levitating' on a little.....read more
    Posted by AlexMuller
    Scientists detect comets outside our solar system..read more
    Posted by AlexMuller
    Advanced artificial limbs mapped in the brain..read more
    Posted by AlexMuller
    Bacteria have a sense of touch..read more
    Posted by AlexMuller
    Recurrent brain cancer: New hope with phase 1 clinical trial.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me