I am involved in several planetary missions. I am the former project scientist for the Mars Science Laboratory (MSL) mission, which is a rover the size of a small car that launched in November 2011 and landed in Gale crater on Mars on August 5, 2012 (PDT). I am also a participating scientist for the Mars Exploration Rovers and for the HiRISE camera onboard the Mars Reconnaissance Orbiter.
A long-standing goal of Mars environmental studies has been to understand the role of water throughout its geologic history. The presence of water is a strong indicator of potential habitability as well as of formerly different climatic conditions. Prior to studies by the Mars Exploration Rovers, most studies of water-related processes had been based on analysis of geomorphic attributes. However, we can now examine the record of past surface processes, including the role of water, through sedimentologic studies of the stratigraphic record of Mars. Many processes that operate at a planetary surface have the potential to create a record of sedimentary rocks. Sedimentary rocks can provide clues that allow past environmental conditions to be reconstructed. Therefore, the detection of sediment transport by water and wind in ancient sedimentary layers is important, because it provides insight into past climatic regimes and potential habitability.
The HiRISE Camera has allowed new views of Mars at unprecedented resolution. Studies using images acquired by this camera allow us to study sedimentary rocks on Mars from orbit. By combining maps of geomorphic features and dips of layers measured from stereo pairs of images processed into a Digital Elevation Model (DEM), we can begin to untangle the detailed history of particular areas on Mars.
The Mars Science Laboratory Curiosity rover launched on Saturday, November 26th at 10:02 am EST on-board an Atlas V-541 rocket from Cape Canaveral, Florida. The cruise stage successfully separated from the rocket and the rover landed on Mars on August 5, 2012. Curiosity’s mission is to determine the planet's habitability and has been doing this by using a suite a sophisticated instruments including cameras, spectrometers, environmental sensors, sample-collection tools, and laboratory-quality geochemical instruments.
Entry, descent, and landing utilized a sky crane touchdown system. Due to the large size of the rover (900 kg), it could not use airbags like the Mars Exploration Rovers. The sky crane system placed the rover on its wheels, ready to begin surface operations. An animation of the landing can be found here.
Sol 1099 Mastcam image of lower Mt. Sharp
The rover landed in northwestern Gale Crater, which is a 154 km diameter crater with a central mountain of sedimentary strata over 5 km high. The lower portion is made up of interbedded sulfates and phyllosilicates, suggesting that deposition occurred during changing environmental conditions. The Gale mound may be the surviving remnant of an extensive sequence of deposits observed over a widespread region. Exploring detailed stratigraphy of the lower mound is helping address MSL’s overall goal of searching for habitable environments on Mars.s
Curiosity successfully completed its primary mission in 2014, and has had continued success in its extended mission. In the first years of operations, Curiosity traversed over stream-rounded pebbles to a site where mud accumulated from an ancient lake. The mudstones drilled and analyzed yielded evidence for long-lived fresh water, the major elemental building blocks of life, and a source of chemical energy capable of sustaining microbial life.
Curiosity continues its traverse up the higher and younger strata of Mt. Sharp to study ancient environmental transitions and to identify habitable environments capable of preserving organic compounds. Watch the 2016 AGU Press Conference for recent findings:
Check out my article on Habitability, Taphonomy, and Curiosity’s Hunt for Organic Carbon
(one of the bloggers, Lauren Edgar, is a former Grotzinger group member!)
My New York Times article titled "The World of Mars" can be found here
Papers about the MSL mission can be found here: http://mars.nasa.gov/msl/mission/science/researchpapers/
You can find out where Curiosity is now: http://mars.jpl.nasa.gov/msl/mission/whereistherovernow/