Present-Day Impact Cratering Rate and Contemporary Gully Activity on Mars

@article{Malin2006PresentDayIC,
  title={Present-Day Impact Cratering Rate and Contemporary Gully Activity on Mars},
  author={Michael C. Malin and Kenneth S. Edgett and Liliya V. Posiolova and Shawn M. McColley and Eldar Noe Dobrea},
  journal={Science},
  year={2006},
  volume={314},
  pages={1573 - 1577}
}
The Mars Global Surveyor Mars Orbiter Camera has acquired data that establish the present-day impact cratering rate and document new deposits formed by downslope movement of material in mid-latitude gullies on Mars. Twenty impacts created craters 2 to 150 meters in diameter within an area of 21.5 × 106 square kilometers between May 1999 and March 2006. The values predicted by models that scale the lunar cratering rate to Mars are close to the observed rate, implying that surfaces devoid of… 
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