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Showing 1–5 of 5 results
Advanced filters: Author: Oded Aharonson Clear advanced filters

  • The martian atmosphere has progressively thinned, allowing increasingly smaller meteorites to survive unscathed and impact the surface. The distribution of small craters in ancient river deposits on Mars suggests an atmospheric pressure less than that needed to warm the martian surface above freezing 3.5 billion years ago, when rivers presumably flowed.

    • Edwin S. Kite
    • Jean-Pierre Williams
    • Oded Aharonson
    Research
    Nature Geoscience
    Volume: 7, P: 335-339

  • Observations from the Lunar Orbiter Laser Altimeter reveal the Moon’s Shackleton crater to be an ancient, unusually well-preserved simple crater whose interior walls are younger than its floor and rim; the relative brightness of the floor at 1,064 nanometres is most readily explained by minimal volatile accumulation since crater formation and decreased space weathering due to permanent shadow.

    • Maria T. Zuber
    • James W. Head
    • H. Jay Melosh
    Research
    Nature
    Volume: 486, P: 378-381

  • On Uranus and Neptune, the measured fourth-order gravity harmonic, J4, constrains the atmospheric dynamics to the outermost 0.15 per cent and 0.2 per cent, respectively, of the planetary mass, indicating that these dynamics are confined to a thin weather layer no more than 1,000 kilometres deep on both planets.

    • Yohai Kaspi
    • Adam P. Showman
    • Ravit Helled
    Research
    Nature
    Volume: 497, P: 344-347

  • The Martian 'hemispheric dichotomy' is expressed as a dramatic difference in elevation and crustal thickness between the southern highlands and northern lowlands. A set of single impact initial conditions by which a large impactor can produce features that are consistent with the observed dichotomy's crustal structure have been found. Using 3D hydrodynamic simulations, the models produce large variations in post-impact states depending on impact energy, velocity and, importantly, impact angle.

    • Margarita M. Marinova
    • Oded Aharonson
    • Erik Asphaug
    Research
    Nature
    Volume: 453, P: 1216-1219

  • A giant impact has been proposed as being responsible for forming the Moon, but scenarios that match existing constraints are improbable. Numerical modelling now suggests that instead a series of smaller and more common impacts can explain the Earth–Moon system.

    • Raluca Rufu
    • Oded Aharonson
    • Hagai B. Perets
    Research
    Nature Geoscience
    Volume: 10, P: 89-94