Featured Research

from universities, journals, and other organizations

Odd-looking Martian Craters Indicate Hidden Ice

Date:
January 8, 2009
Source:
American Geophysical Union
Summary:
Surface features common in the northern and southern midlatitudes of Mars and known as lobate debris aprons and lineated valley fill are believed to have formed either as debris flows mobilized by pore ice or as debris-covered glaciers.

Surface features common in the northern and southern midlatitudes of Mars and known as lobate debris aprons and lineated valley fill are believed to have formed either as debris flows mobilized by pore ice or as debris-covered glaciers.

To learn more, Kress and Head define and analyze ring mold craters, which are abundant on debris aprons and lineated valley fill but not seen in surrounding terrain. Ring mold craters are concentric crater forms named for their similarity to the cooking implement, in contrast to the bowl-shaped craters that are common at such small sizes (hundreds of meters (hundreds to thousands of feet) in diameter).

On the basis of similarities in shape of ring mold craters to laboratory impact craters in ice and of the physics of impact cratering into pure ice, the authors interpret ring mold craters to result from projectiles hitting relatively pure ice below a thin debris layer.

These results support the hypothesis that lobate debris aprons and lineated valley fill are debris-covered glaciers and that many hundreds of meters of ice remain in these deposits today on Mars.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ailish M. Kress et al. Ring-mold craters in lineated valley fill and lobate debris aprons on Mars: Evidence for subsurface glacial ice. Geophysical Research Letters, DOI: 10.1029/2008GL035501

Cite This Page:

American Geophysical Union. "Odd-looking Martian Craters Indicate Hidden Ice." ScienceDaily. ScienceDaily, 8 January 2009. <www.sciencedaily.com/releases/2009/01/090102101328.htm>.
American Geophysical Union. (2009, January 8). Odd-looking Martian Craters Indicate Hidden Ice. ScienceDaily. Retrieved April 17, 2014 from www.sciencedaily.com/releases/2009/01/090102101328.htm
American Geophysical Union. "Odd-looking Martian Craters Indicate Hidden Ice." ScienceDaily. www.sciencedaily.com/releases/2009/01/090102101328.htm (accessed April 17, 2014).

Share This



More Space & Time News

Thursday, April 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

New Baby Moon 'Peggy' Spotted In Saturn's Rings

New Baby Moon 'Peggy' Spotted In Saturn's Rings

Newsy (Apr. 15, 2014) A bump in the rings could be a half-mile-wide miniature moon. It was found by accident in Cassini probe images. Video provided by Newsy
Powered by NewsLook.com
Americas Glimpse Total Lunar Eclipse

Americas Glimpse Total Lunar Eclipse

AFP (Apr. 15, 2014) A total lunar eclipse, the first since December 2011, took place early Tuesday morning with the Americas getting the best glimpse. Duration: 1:19 Video provided by AFP
Powered by NewsLook.com
NASA Showcases Lunar Eclipse

NASA Showcases Lunar Eclipse

AP (Apr. 15, 2014) Star gazers in parts of North and South America got a rare treat early Tuesday morning - a total eclipse of the moon. (April 15) Video provided by AP
Powered by NewsLook.com
Spacecrafts Could Use Urine As Fuel Source

Spacecrafts Could Use Urine As Fuel Source

Newsy (Apr. 15, 2014) New research says the urea from urine could be recycled for fuel. Urea is filtered out of wastewater when making drinking water. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins