Feeds

New analysis points to ancient Martian ocean, river valleys

Just a matter of finding sea-monster skeletons, now

Secure remote control for conventional and virtual desktops

NASA-funded boffins say they have found convincing evidence that much of Mars was once covered by an ocean of liquid water, and that rain fell on the red planet long ago.

The new research comes from scientists at Northern Illinois University and the Lunar and Planetary Institute in Houston, who have done a new computer analysis of valley networks on the fourth planet. The new picture indicates more and longer valleys than had previously been generally supposed, and further, that the valley networks tend to be concentrated in a belt round the planet south of the equator.

This, according to the scientists, provides backing for the already much-discussed theory that much of Mars' northern hemisphere was once an ocean. Rain falling in the south would have carved the valleys of the belt as it flowed toward the sea.

“All the evidence gathered by analyzing the valley network on the new map points to a particular climate scenario on early Mars,” says NIU geography prof Wei Luo. “It would have included rainfall and the existence of an ocean covering most of the northern hemisphere, or about one-third of the planet's surface.”

“The presence of more valleys indicates that it most likely rained on ancient Mars, while the global pattern showing this belt of valleys could be explained if there was a big northern ocean,” adds his collaborator Tomasz Stepinski, staff scientist at the Lunar and Planetary Institute.

Boffins have long argued over what formed the valleys of Mars, with some contending that it had to be rain runoff as is typically - but not always - the case on Earth. This would mean a wet, possibly life-bearing past for the nowadays largely airless and arid red planet.

Other scientists contend that other processes - ones which can occur in dry conditions - may have led to the valleys' formation. But Lou and Stepinski are having none of that.

“It is now difficult to argue against runoff erosion as the major mechanism of Martian valley network formation,” says Luo.

The two profs believe that rain would have mostly fallen on the northern ocean and the landmass near it, with very few rainclouds managing to get as far as the southern polar region. That would have been a desert even in the red planet's remote past.

The research paper, Computer-Generated Global Map of Valley Networks on Mars, is published for subscribers to the Journal of Geophysical research - Planets here. ®

Beginner's guide to SSL certificates

More from The Register

next story
Antarctic ice THICKER than first feared – penguin-bot boffins
Robo-sub scans freezing waters, rocks warming models
I'll be back (and forward): Hollywood's time travel tribulations
Quick, call the Time Cops to sort out this paradox!
Your PHONE is slowly KILLING YOU
Doctors find new Digitillnesses - 'text neck' and 'telepressure'
Reuse the Force, Luke: SpaceX's Elon Musk reveals X-WING designs
And a floating carrier for recyclable rockets
Britain's HUMAN DNA-strewing Moon mission rakes in £200k
3 days, and Kickstarter moves lander 37% nearer takeoff
Rosetta science team thinks Philae might come to life in the spring
And disclose the biggest surprise of Comet 67P
prev story

Whitepapers

Designing and building an open ITOA architecture
Learn about a new IT data taxonomy defined by the four data sources of IT visibility: wire, machine, agent, and synthetic data sets.
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.
5 critical considerations for enterprise cloud backup
Key considerations when evaluating cloud backup solutions to ensure adequate protection security and availability of enterprise data.
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.
Managing SSL certificates with ease
The lack of operational efficiencies and compliance pitfalls associated with poor SSL certificate management, and how the right SSL certificate management tool can help.