Social Media Sidebar


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

Mars Used To Look More White Than Red

Posted in Science on 27th May, 2016 02:22 PM by AlexMuller

A few hundred thousand years ago, you would have have seen a gleaming-white ice ball where Mars should be. A team of astronomers led by Isaac Smith at the Southwest Research Institute in Colorado has collected the first concrete evidence that Mars has just exited an extreme ice age, one so intense it would have put Earth's recent frosty foray to shame. 

Using cameras and a radar-pinging device on board NASA's Mars Reconnaissance Orbiter, Smith's team deduced this history by dating the miles-deep layers of snow and ice packed onto the Red Planet's northern pole. They found that only a mere 370,000 years ago, "Mars would have actually looked more white than red," says Smith. The Mars research is outlined today in the journal Science. 
When scientists wish to peer back into the history of Earth's changing climate, they can dig down into our polar caps and extract long tubular ice cores. As snow and ice slowly accumulates on our poles, subtle snapshots of Earth's past climate get buried. This information is locked into gas bubbles or sediments in the ice; dissecting sections of the ice can reveal a detailed history of our planet. 
However, no current Martian rover has the range or capability to go digging into Mars's snow and uncover the martian climate history locked away inside it. Instead, Smith's team had to be clever. The scientists took advantage of a ground-penetrating radar device on NASA's Mars Reconnaissance Orbiter, called the Shallow Subsurface Radar. 
SHARAD pings down toward Mars more than 700 times per second. As the Mars Reconnaissance Orbiter floated over the northern pole, that radar "allowed us to see down to the bottom of the ice, about 2 km deep," Smith says, and helped the team slowly to create a 2D cross-section of the icecap, "an image a bit like how when you cut a cake with layers in it, you can see those layers," he says. Smith's team was able to compare those ice layers to reveal changes in ice accumulation at various points in Mars's history. 
Mars's past ice ages and its ones yet to come are wild and intense, thanks to some peculiarities in the planet's spin and orbit. The axis upon which the Earth spins varies by about 2 degrees over time; on Mars, it can deviate by up to 60 degrees. As Mars wobbles over the millennia, "you have points where you get almost direct, full sun on the south pole all summer," says Smith, keeping the Northern pole in an endless, wintry night. Mars's orbit around the Sun is also unique, bringing it "at times up to 12 percent farther from the sun, which has a huge effect on the sunlight that reaches the planet." 
The takeaway is that Mars is currently in a lull between glacial periods. "Right now we're stabilized... but about 150,000 years in the future we can expect another ice age to happen," Smith says. That's far enough in the future that it likely won't effect even the longest-term plans for human colonization on Mars. But this new information could help us plan future terraforming of the Red Planet.
"The radar mapping of the poles shows that there is a lot of H2O and CO2 trapped there," says Chris McKay, an astrophysicist at NASA who was not involved in Smith's research. McKay finds this promising: "Terraforming is predicated on our ability to release these gases and liquids into the atmosphere."

Tags: MarsspaceplaneticeNASAice ageastronomy

Read original article » Back to category



Recent headlines

  • Posted in Medicine on 2018-03-18 20:36:22
    Study suggests our biological ageing is slowing more
    Posted in Science on 2018-03-18 20:25:57
    NASA's plan to bat away Earth-bound more
    Posted in Science on 2018-03-18 20:21:05
    Nearly 7,000 New Craters Discovered On Moon By AI more
    Posted in Medicine on 2018-03-17 19:49:27
    A simple artificial heart could permanently replace more
    Posted in Software on 2018-03-16 11:03:28
    60.3% of harmful Android apps in 2017 detected more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs, more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target more

Recent Blog Posts

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

Login to your Account

Login to your PlanetTech Account here

Remember me

Create a New Account

You just need username and password

The following errors occured:
Verify password:
Remember me