Was this ridge habitable? Mars Curiosity eyes nearby mountain

Oct 17, 2013 by Elizabeth Howell
Curiosity’s landing site is about eight miles (five kilometers) from a hematite-rich ridge at the bottom of Mount Sharp (Aeolis Mons). Credit: NASA/JPL-Caltech/MSSS, annotated by A. Fraeman

So Curiosity has been on Mars for an Earth year and is now, slowly, making its way over to that ginormous mountain—Mount Sharp, or Aeolis Mons—in the distance. The trek is expected to take at least until mid-2014, if not longer, because the rover will make pit stops at interesting science sites along the way. But far-thinking scientists are already thinking about what areas they would like to examine when it gets there.

One of those is an area that appears to have formed in water. There's a low ridge on the bottom of the mountain that likely includes hematite, a mineral that other Mars rovers have found. (Remember the "blueberries" spotted a few years ago?) Hematite is an iron mineral that comes to be "in association with water", a new study reports, and could point the way to the habitable conditions Curiosity is seeking.

The rub is scientists can't say for sure how the formed until the rover is practically right next to the ridge. There are plenty of pictures from orbit, but not high-resolution enough for the team to make definitive answers.

"Two alternatives are likely: chemical precipitation within the rocks by underground water that became exposed to an oxidizing environment—or weathering by neutral to slightly acidic water," wrote Arizona State University's Red Planet Report. Either way, it shows the ridge likely hosted iron oxidation. Earth's experience with this type of oxidation shows that it happens "almost exclusively" with microorganisms, but that's not a guarantee on Mars.

Mars Reconnaissance Orbiter images show that the ridge is about 660 feet (200 meters) wide and four miles (6.5 kilometers) long, with strata or layers in the ridge appearing to be similar to those of layers in Mount Sharp.

While Curiosity is not designed to seek life, it can ferret out details of the environment. Just a few weeks ago, for example, it uncovered pebbles that likely formed in the presence of water. Other Mars missions have also found evidence of that liquid, with perhaps some of it once arising from the subsurface. Where the came from, and why the environment of Mars changed so much in the last few billion years, are ongoing scientific questions.

Check out more details on the study in Geology.

Explore further: NASA's Mars Curiosity debuts autonomous navigation

add to favorites email to friend print save as pdf

Related Stories

Ancient streambed found on surface of Mars

May 30, 2013

Rounded pebbles on the surface of Mars indicate that a stream once flowed on the red planet, according to a new study by a team of scientists from NASA's Curiosity rover mission, including a University of ...

Recommended for you

Titan offers clues to atmospheres of hazy planets

22 hours ago

When hazy planets pass across the face of their star, a curious thing happens. Astronomers are not able to see any changes in the range of light coming from the star and planet system.

Having fun with the equation of time

22 hours ago

If you're like us, you might've looked at a globe of the Earth in elementary school long before the days of Google Earth and wondered just what that strange looking figure eight thing on its side was.

The source of the sky's X-ray glow

Jul 27, 2014

In findings that help astrophysicists understand our corner of the galaxy, an international research team has shown that the soft X-ray glow blanketing the sky comes from both inside and outside the solar system.

User comments : 0