[meteorite-list] Opportunity Sees Tiny Spheres in Martian Soil

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From: Howard Wu <freewu2000_at_meteoritecentral.com>
Date: Thu Apr 22 10:31:20 2004
Message-ID: <20040205022601.56353.qmail_at_web60006.mail.yahoo.com>

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This is a meteorite crater. Perhaps these are like the spheroids they find in the Arizona crater?

Howard

Ron Baalke <baalke_at_zagami.jpl.nasa.gov> wrote:

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA 91109. TELEPHONE (818) 354-5011
http://www.jpl.nasa.gov

Guy Webster (818) 354-5011
Jet Propulsion Laboratory, Pasadena, Calif.

Donald Savage (202) 358-1547
NASA Headquarters, Washington, D.C.

NEWS RELEASE: 2004-051 February 4, 2004

Opportunity Sees Tiny Spheres in Martian Soil

NASA's Opportunity has examined its first patch of soil in the small
crater where the rover landed on Mars and found strikingly spherical
pebbles among the mix of particles there.

"There are features in this soil unlike anything ever seen on Mars
before," said Dr. Steve Squyres of Cornell University, Ithaca, N.Y.,
principal investigator for the science instruments on the two Mars
Exploration Rovers.

For better understanding of the soil, mission controllers at NASA's
Jet Propulsion Laboratory, Pasadena, Calif., plan to use Opportunity's
wheels later this week to scoop a trench to expose deeper material.
One front wheel will rotate to dig the hole while the other five
wheels hold still.

The spherical particles appear in new pictures from Opportunity's
microscopic imager, the last of 20 cameras to be used on the two rover
missions. Other particles in the image have jagged shapes. "The
variety of shapes and colors indicates we're having particles brought
in from a variety of sources," said Dr. Ken Herkenhoff of the U.S.
Geological Survey's Astrogeology Team, Flagstaff, Ariz.

The shapes by themselves don't reveal the particles' origin with
certainty. "A number of straightforward geological processes can
yield round shapes," said Dr. Hap McSween, a rover science team member
from the University of Tennessee, Knoxville. They include accretion
under water, but apparent pores in the particles make alternative
possibilities of meteor impacts or volcanic eruptions more likely
origins, he said.

A new mineral map of Opportunity's surroundings, the first ever done
from the surface of another planet, shows that concentrations of
coarse-grained hematite vary in different parts of the crater. The
soil patch in the new microscopic images is in an area low in
hematite. The map shows higher hematite concentrations inside the
crater in a layer above an outcrop of bedrock and on the slope just
under the outcrop.

Hematite usually forms in association with liquid water, so it holds
special interest for the scientists trying to determine whether the
rover landing sites ever had watery environments possibly suitable for
sustaining life. The map uses data from Opportunity's miniature
thermal emission spectrometer, which identifies rock types from a
distance.

"We're seeing little bits and pieces of this mystery, but we haven't
pieced all the clues together yet," Squyres said.

Opportunity's Moessbauer spectrometer, an instrument on the rover's
robotic arm designed to identify the types of iron-bearing minerals in
a target, found a strong signal in the soil patch for olivine. Olivine
is a common ingredient in volcanic rocks. A few days of analysis may
be needed to discern whether any fainter signals are from hematite,
said Dr. Franz Renz, science team member from the University of Mainz,
Germany.

To get a better look at the hematite closer to the outcrop,
Opportunity will go there. It will begin by driving about 3 meters (10
feet) tomorrow, taking it about halfway to the outcrop. On Friday it
will dig a trench with one of its front wheels, said JPL's Dr. Mark
Adler, mission manager.

Opportunity's twin, Spirit, today is reformatting its flash memory, a
preventive measure that had been planned for earlier in the week. "We
spent the last four days in the testbed testing this," Adler said.
"It's not an operation we do lightly. We've got to be sure it works
right." Tomorrow, Spirit will resume examining a rock called
Adirondack after a two-week interruption by computer memory problems.
Controllers plan to tell Spirit to brush dust off of a rock and
examine the cleaned surface tomorrow.

Each martian day, or "sol," lasts about 40 minutes longer than an
Earth day. Spirit begins its 33rd sol on Mars at 2:43 a.m. Thursday,
Pacific Standard Time. Opportunity begins its 13th sol on Mars at
3:04 p.m. Thursday, PST.

JPL, a division of the California Institute of Technology in Pasadena,
manages the Mars Exploration Rover project for NASA's Office of Space
Science, Washington, D.C. Images and additional information about the
project are available from JPL at

http://marsrovers.jpl.nasa.gov

and from Cornell University at

http://athena.cornell.edu/ .

-end-

______________________________________________
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Meteorite-list_at_meteoritecentral.com
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<DIV>This is a meteorite crater. Perhaps these are like the spheroids they find in the Arizona crater?</DIV>
<DIV> </DIV>
<DIV>Howard Ron Baalke <baalke_at_zagami.jpl.nasa.gov> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> MEDIA RELATIONS OFFICE JET PROPULSION LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY NATIONAL AERONAUTICS AND SPACE ADMINISTRATION PASADENA, CALIFORNIA 91109. TELEPHONE (818) 354-5011 http://www.jpl.nasa.gov Guy Webster (818) 354-5011 Jet Propulsion Laboratory, Pasadena, Calif. Donald Savage (202) 358-1547 NASA Headquarters, Washington, D.C. NEWS RELEASE: 2004-051 February 4, 2004 Opportunity Sees Tiny Spheres in Martian Soil NASA's Opportunity has examined its first patch of soil in the small crater where the rover landed on Mars and found strikingly spherical pebbles among the mix of particles there. "There are features in this soil unlike anything ever seen on Mars before," said Dr. Steve Squyres of Cornell University, Ithaca, N.Y., principal investigator for the science instruments on the two
Mars Exploration Rovers. For better understanding of the soil, mission controllers at NASA's Jet Propulsion Laboratory, Pasadena, Calif., plan to use Opportunity's wheels later this week to scoop a trench to expose deeper material. One front wheel will rotate to dig the hole while the other five wheels hold still. The spherical particles appear in new pictures from Opportunity's microscopic imager, the last of 20 cameras to be used on the two rover missions. Other particles in the image have jagged shapes. "The variety of shapes and colors indicates we're having particles brought in from a variety of sources," said Dr. Ken Herkenhoff of the U.S. Geological Survey's Astrogeology Team, Flagstaff, Ariz. The shapes by themselves don't reveal the particles' origin with certainty. "A number of straightforward geological processes can yield round shapes," said Dr. Hap McSween, a rover science team member from the University of
Tennessee, Knoxville. They include accretion under water, but apparent pores in the particles make alternative possibilities of meteor impacts or volcanic eruptions more likely origins, he said. A new mineral map of Opportunity's surroundings, the first ever done from the surface of another planet, shows that concentrations of coarse-grained hematite vary in different parts of the crater. The soil patch in the new microscopic images is in an area low in hematite. The map shows higher hematite concentrations inside the crater in a layer above an outcrop of bedrock and on the slope just under the outcrop. Hematite usually forms in association with liquid water, so it holds special interest for the scientists trying to determine whether the rover landing sites ever had watery environments possibly suitable for sustaining life. The map uses data from Opportunity's miniature thermal emission spectrometer, which identifies rock types
from a distance. "We're seeing little bits and pieces of this mystery, but we haven't pieced all the clues together yet," Squyres said. Opportunity's Moessbauer spectrometer, an instrument on the rover's robotic arm designed to identify the types of iron-bearing minerals in a target, found a strong signal in the soil patch for olivine. Olivine is a common ingredient in volcanic rocks. A few days of analysis may be needed to discern whether any fainter signals are from hematite, said Dr. Franz Renz, science team member from the University of Mainz, Germany. To get a better look at the hematite closer to the outcrop, Opportunity will go there. It will begin by driving about 3 meters (10 feet) tomorrow, taking it about halfway to the outcrop. On Friday it will dig a trench with one of its front wheels, said JPL's Dr. Mark Adler, mission manager. Opportunity's twin, Spirit, today is reformatting its flash memory,
a preventive measure that had been planned for earlier in the week. "We spent the last four days in the testbed testing this," Adler said. "It's not an operation we do lightly. We've got to be sure it works right." Tomorrow, Spirit will resume examining a rock called Adirondack after a two-week interruption by computer memory problems. Controllers plan to tell Spirit to brush dust off of a rock and examine the cleaned surface tomorrow. Each martian day, or "sol," lasts about 40 minutes longer than an Earth day. Spirit begins its 33rd sol on Mars at 2:43 a.m. Thursday, Pacific Standard Time. Opportunity begins its 13th sol on Mars at 3:04 p.m. Thursday, PST. JPL, a division of the California Institute of Technology in Pasadena, manages the Mars Exploration Rover project for NASA's Office of Space Science, Washington, D.C. Images and additional information about the project are available from JPL at
 http://marsrovers.jpl.nasa.gov and from Cornell University at http://athena.cornell.edu/ . -end- ______________________________________________ Meteorite-list mailing list Meteorite-list_at_meteoritecentral.com http://www.pairlist.net/mailman/listinfo/meteorite-list</BLOCKQUOTE><hr size=1> <a href="http://uk.rd.yahoo.com/mail/tagline_messenger/*http://uk.messenger.yahoo.com">
Yahoo! Messenger</a> - Communicate instantly..."Ping" your friends
today! <a href="http://uk.rd.yahoo.com/mail/tagline_messenger/*http://uk.messenger.yahoo.com/download/index.html">Download Messenger Now</a>
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Received on Wed 04 Feb 2004 09:26:01 PM PST

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