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  • 1
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    Distant Secondary Craters and Age Constraints on Young Martian Terrains (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Are small (less than approx. 1 km diameter) craters on Mars and the Moon dominated by primary impacts, by secondary impacts of much larger primary craters, or are both primaries and secondaries significant? This question is critical to age constraints for young terrains and for older terrains covering small areas, where only small craters are superimposed on the unit. If the martian rayed crater Zunil is representative of large impact events on Mars, then the density of secondaries should exceed the density of primaries at diameters a factor of ~1000 smaller than that of the largest contributing primary crater. On the basis of morphology and depth/diameter measurements, most small craters on Mars could be secondaries. Two additional observations (discussed below) suggest that the production functions of Hartmann and Neukum predict too many primary craters smaller than a few hundred meters in diameter. Fewer small, high-velocity impacts may explain why there appears to be little impact regolith over Amazonian terrains. Martian terrains dated by small craters could be older than reported in recent publications.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 13; LPI-Contrib-1234-Pt-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Probabilistic guidance for scheduling Mars rover traverses (2003)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: SMC-IT Conference; Pasadena, CA; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Probabilistic guidance for scheduling Mars rover traverses (2003)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: International Conference on Space Mission Challenges for Information Technology 2003; Pasadena, CA; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Small Crater Morphology Within Gusev Crater and Isidis Planitia: Evidence for Widespread Secondaries on Mars (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Large (greater than 2 km diameter) impact craters on the martian surface have been extensively studied and modeled. Craters smaller than this were known to exist but the lack of high-resolution images prevented detailed measurements and descriptions. Images obtained by the Mars Orbiter Camera (MOC) on Mars Global Surveyor are of sufficient resolution to perform detailed studies on the morphology of small (less than 1 km diameter) craters. Previous workers have suggested that many of these small craters are secondary craters; while others maintain that they represent primary impacts. The difference is significant, however, because of implications for surface age, climate change, impact generated regolith, provenance of surface rocks, engineering considerations (landing safety and rover trafficability), and the origin of martian meteorites.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXV: Impacts on Mars and Earth; LPI-Contrib-1197
    Format: text
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  • 5
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    How Do You Answer the Life on Mars Question? Use Multiple Small Landers Like Beagle 2 (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: To address one of the most important questions in planetary science Is there life on Mars? The scientific community must turn to less costly means of exploring the surface of the Red Planet. The United Kingdom's Beagle 2 Mars lander concept was a small meter-size lander with a scientific payload constituting a large proportion of the flown mass designed to supply answers to the question about life on Mars. A possible reason why Beagle 2 did not send any data was that it was a one-off attempt to land. As Steve Squyres said at the time: "It's difficult to land on Mars - if you want to succeed you have to send two of everything".
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-CN-26527 , Mars Exploration Meeting; Jun 12, 2012 - Jun 14, 2012; Houston, TX; United States
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