Micro-CT scanning enables detailed examination of clasts within lunar rocks

Our @NASA_ARES staff has completed preliminary work on the use of Micro-CT scanning with Apollo samples.  This animation illustrates how we used Micro-CT scanning to obtain detail on a specific basaltic clast within Apollo sample 60639.  As the animation begins you are first looking at the exterior surface of the sample before “cutting in” to look within the sample focusing in on the basaltic clast.  Making the low density portions of the rock transparent gives a better view of the whole clast and other high density clasts and mineral grains (e.g., olivines & pyroxenes) within the sample.  (Animation created through a collaboration between NASA_ARES & Natasha Almeida at the Natural History Museum in London.)

View animation at: https://youtu.be/Lgivyr3kICY

MicroCTScan_Screenshot

 

Celebrating the Apollo 11 Mission and the First Lunar Samples Returned to Earth

Apollo 11 launch, landing, rock collection, and sample delivery to the Lunar Receiving Laboratory. Picture of lunar rock shown on bottom right.

Apollo 11 launch, landing, rock collection, and sample delivery to the Lunar Receiving Laboratory. Picture of lunar rock shown on bottom right.

Apollo 11 astronaut Neil Armstrong, the first person to walk on the surface of the Moon, uttered a statement heard around the world in July 1969…“That’s one small step for man, one giant leap for mankind.” Apollo 11 launched on July 16, landed on the Moon on July 20th, and safely returned to Earth on July 24, 1969. This extraordinary mission, 45 years ago, was also the first time astronauts collected and brought back samples from the lunar surface. These precious Apollo 11 samples, and others collected during other Apollo missions to the Moon, continue to help scientists investigate and better understand the history of the Moon. All collected lunar rocks and soils are housed in the specialized lunar curational facilitates maintained by the Astromaterials Research and Exploration Science (ARES) staff at the NASA Johnson Space Center in Houston, Texas.

Ancient Mars Rocks: Any Indication of Building Blocks of Life?

YellowknifeBayFormation

View of Yellowknife Bay Formation, with Drilling Sites
This mosaic of images from Curiosity’s Mast Camera (Mastcam) shows geological members of the Yellowknife Bay formation, and the sites where Curiosity drilled into the lowest-lying member, called Sheepbed, at targets “John Klein” and “Cumberland.” Unannotated version of image.

NASA’s Curiosity rover is providing vital insight about Mars’ past and current environments that will aid plans for future robotic and human missions.
In a little more than a year on the Red Planet, the mobile Mars Science Laboratory (MSL) has determined the age of a Martian rock, found evidence the planet could have sustained microbial life, taken the first readings of radiation on the surface, and shown how natural erosion could reveal the building blocks of life. Curiosity team members presented these results and more in six papers published online December 9, 2013 by Science Express and in talks at the Fall Meeting of the American Geophysical Union (AGU) in San Francisco.

The second rock Curiosity drilled for a sample on Mars, which scientists nicknamed “Cumberland,” is the first ever to have its mineralogy and age analyzed on its home planet. All previous extraterrestrial samples have needed to be brought back to Earth for such an analysis. A report by Kenneth Farley of the California Institute of Technology (Caltech) in Pasadena, and co-authors, estimates the age of Cumberland at 3.86 billion to 4.56 billion years old. This is in the range of earlier estimates for rocks in Gale Crater, where Curiosity is working.

Before they could measure rocks directly on Mars, scientists estimated their ages by counting and comparing the numbers of impact craters on various areas of the planet. The crater densities are correlated with ages based on comparisons with crater densities on the moon, which were tied to absolute dates after the Apollo lunar missions returned rocks to Earth.

As part of this science team, Doug Ming researches whether the Mars rocks have any indication of the building blocks of life.
Finding rocks with the youngest exposure age is important in the mission’s investigations of whether organic chemicals are preserved from ancient environments. Organic chemicals are building blocks for life, although they also can be produced without biological activity.
“We’re making progress on the path to determining whether there are Martian organics in there,” Doug Ming, of NASA’s Johnson Space Center in Houston said of the Cumberland rock sample. “We detect organics but can’t rule out that they might be brought along from Earth.” Curiosity detected higher amounts in Cumberland than it did in either test runs with Martian soil samples or analysis of empty sample cups. Increasing the amount of rock powder in the test cup increased the amount of organic content detected.

Ming is the lead author of a new report about a site called “Yellowknife Bay.” The team reported 10 months ago that the first rock Curiosity drilled there, nicknamed “John Klein,” yielded evidence that met the mission’s goal of identifying a Martian environment favorable for microbial life long ago. Yellowknife Bay’s clay-rich lakebed habitat offers the key chemical elements for life, plus water not too acidic or salty, and an energy source. The energy source is a type used by many rock-eating microbes on Earth: a mix of sulfur- and iron-containing minerals that are ready acceptors of electrons, and others that are ready electron donors, like the two poles of a battery.

Scientists within the Astromaterials Research and Exploration Science Directorate (ARES) of NASA Johnson Space Center, Houston, Texas who conducted research and were co-authors of the publications in the Science Express Dec 9, 2013 release are:
Paul Douglas Archer, Francis Cucinotta, John H. Jones, Douglas Ming, Richard V. Morris, Paul Niles, Elizabeth Rampe and Jacobs scientists: Cherie Achilles, Dorothy Oehler, Brad Sutter.

See the full NASA Press release, “NASA Rover Results Include First Age Measurement on Mars and Help for Human Exploration”,   NASA Release 13-366 on Dec. 9, 2013.