Featured Research

from universities, journals, and other organizations

Ancient volcanic blast provides more evidence of water on early Mars

Date:
May 4, 2012
Source:
Georgia Institute of Technology
Summary:
Georgia Tech Assistant Professor Josef Dufek's new findings provide more evidence that early Mars was saturated with water and that its atmosphere was considerably thicker, at least 20 times more dense, than it is today.

This bomb sag on the surface of Mars was created during a volcanic blast approximately 3.5 billion years ago. Assistant Professor Josef Dufek has replicated the sag in his lab while studying the possibility of water and atmospheric conditions of early Mars.
Credit: NASA/JPL

The atmosphere of Mars is less than 1 percent the density of Earth's. It's one of the reasons liquid water covers much of our planet but cannot exist on the Red Planet. As more research points toward the possibility of water on early Mars, scientists have increased their studies on the density of its atmosphere billions of years ago. It's not an easy task. In fact, it's very difficult to even determine Earth's atmospheric pressure from the same time frame.

Related Articles


Georgia Tech Assistant Professor Josef Dufek is attempting to learn more about the past atmospheric conditions by analyzing two unlikely sources: ancient volcanic eruptions and surface observations by the Mars rover Spirit. His new findings, published by the journal Geophysical Research Letters, provide more evidence that early Mars was saturated with water and that its atmosphere was considerably thicker, at least 20 times more dense, than it is today.

"Atmospheric pressure has likely played a role in developing almost all Mars' surface features," said Dufek, an instructor in the School Earth and Atmospheric Sciences. "The planet's climate, the physical state of water on its surface and the potential for life are all influenced by atmospheric conditions."

Dufek's first research tool was a rock fragment propelled into the Martian atmosphere during a volcanic eruption roughly 3.5 billion years ago. The deposit landed in the volcanic sediment, created a divot (or bomb sag), eventually solidified and remains in the same location today. Dufek's next tool was the Mars rover. In 2007, Spirit landed at that site, known as Home Plate, and took a closer look at the imbedded fragment. Dufek and his collaborators at the University of California-Berkeley received enough data to determine the size, depth and shape of the bomb sag.

Dufek and his team then went to the lab to create bomb sags of their own. They created beds of sand using grains the same size as those observed by Spirit. The team propelled particles of varying materials (glass, rock and steel) at different speeds into dry, damp and saturated sand beds before comparing the divots with the bomb sag on Mars. No matter the type of particle, the saturated beds consistently produced impact craters similar in shape to the Martian bomb sag.

By varying the propulsion speeds, Dufek's team also determined that the lab particles must hit the sand at a speed of less than 40 meters per second to create similar penetration depths. In order for something to move through Mars' atmosphere at that peak velocity, the pressure would have to be a minimum of 20 times more dense than current conditions, which suggests that early Mars must have had a thicker atmosphere. Click here for a video demonstration.

"Our study is consistent with growing research that early Mars was at least a transiently watery world with a much denser atmosphere than we see today," said Dufek. "We were only able to study one bomb sag at one location on the Red Planet. We hope to do future tests on other samples based on observations by the next rover, Curiosity."

Curiosity is scheduled to land on Mars on August 5. The material is based upon work supported by NASA under award No NNX09AL20G.


Story Source:

The above story is based on materials provided by Georgia Institute of Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Michael Manga, Ameeta Patel, Josef Dufek, Edwin S. Kite. Wet surface and dense atmosphere on early Mars suggested by the bomb sag at Home Plate, Mars. Geophysical Research Letters, 2012; 39 (1) DOI: 10.1029/2011GL050192

Cite This Page:

Georgia Institute of Technology. "Ancient volcanic blast provides more evidence of water on early Mars." ScienceDaily. ScienceDaily, 4 May 2012. <www.sciencedaily.com/releases/2012/05/120504135732.htm>.
Georgia Institute of Technology. (2012, May 4). Ancient volcanic blast provides more evidence of water on early Mars. ScienceDaily. Retrieved January 26, 2015 from www.sciencedaily.com/releases/2012/05/120504135732.htm
Georgia Institute of Technology. "Ancient volcanic blast provides more evidence of water on early Mars." ScienceDaily. www.sciencedaily.com/releases/2012/05/120504135732.htm (accessed January 26, 2015).

Share This


More From ScienceDaily



More Space & Time News

Monday, January 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Water Fleas Prepare for Space Voyage

Water Fleas Prepare for Space Voyage

Reuters - Innovations Video Online (Jan. 26, 2015) Scientists are preparing a group of water fleas for a unique voyage into space. The aquatic crustaceans, known as Daphnia, can be used as a miniature model for biomedical research, and their reproductive and swimming behaviour will be tested for signs of stress while on board the International Space Station. Jim Drury went to meet the team. Video provided by Reuters
Powered by NewsLook.com
Mars Rover Opportunity Celebrates 11-Year Anniversary

Mars Rover Opportunity Celebrates 11-Year Anniversary

Rumble (Jan. 26, 2015) Eleven years ago NASA&apos;s Opportunity rover touched down on Mars for what was only supposed to be a 90-day mission. Since then it has traveled 25.9 miles (41.7 kilometers), further than any other off-Earth surface vehicle has ever driven. Credit to &apos;NASA&apos;. Video provided by Rumble
Powered by NewsLook.com
NASA's On Course To Take Pluto's Best Photo Ever

NASA's On Course To Take Pluto's Best Photo Ever

Newsy (Jan. 25, 2015) NASA&apos;s New Horizons probe is en route to snap a picture of Pluto this summer, but making sure it doesn&apos;t miss its one chance to do so starts now. Video provided by Newsy
Powered by NewsLook.com
Rosetta Captures Stunning Views, Diverse Data Of Comet 67P

Rosetta Captures Stunning Views, Diverse Data Of Comet 67P

Newsy (Jan. 23, 2015) The first images of the European Space Agency&apos;s Rosetta probe comet orbit could provide clues about its origin and how it got its unique shape. 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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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