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Showing 1–7 of 7 results
Advanced filters: Author: R. Srama Clear advanced filters

  • Fresh ice grains from Enceladus’s plume were analysed during the highest-speed fly-by of the Cassini spacecraft. Organic compounds with a range of chemical structures were discovered, suggesting comprehensive subsurface chemistry on Enceladus.

    • Nozair Khawaja
    • Frank Postberg
    • Ralf Srama
    ResearchOpen Access
    Nature Astronomy
    Volume: 9, P: 1662-1671

  • The detection of complex organic molecules with masses higher than 200 atomic mass units in ice grains emitted from Enceladus indicates the presence of a thin organic-rich layer on top of the moon’s subsurface ocean.

    • Frank Postberg
    • Nozair Khawaja
    • J. Hunter Waite
    Research
    Nature
    Volume: 558, P: 564-568

  • Observations are reported of a permanent, asymmetric dust cloud around the Moon, caused by impacts of high-speed cometary dust particles on eccentric orbits, as opposed to particles of asteroidal origin following near-circular paths striking the Moon at lower speeds.

    • M. Horányi
    • J. R. Szalay
    • Z. Sternovsky
    Research
    Nature
    Volume: 522, P: 324-326

  • Cassini’s Cosmic Dust Analyzer mass spectra of ice grains emitted by Enceladus show the presence of sodium phosphates, suggesting that phosphorus is readily available in Enceladus’s ocean in the form of orthophosphates.

    • Frank Postberg
    • Yasuhito Sekine
    • Shuya Tan
    ResearchOpen Access
    Nature
    Volume: 618, P: 489-493

  • Saturn's moon Enceladus emits plumes of water vapour and ice particles from fractures near its south pole, raising the possibility of a subsurface ocean. Minor organic or siliceous components, identified in many ice grains, could be evidence of interaction between Enceladus' rocky core and liquid water; however it has been unclear whether the water is still present today or if it has frozen. Now, the identification of a population of E-ring grains that are rich in sodium salts suggests that the plumes originate from liquid water.

    • F. Postberg
    • S. Kempf
    • R. Srama
    Research
    Nature
    Volume: 459, P: 1098-1101