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Showing 1–13 of 13 results
Advanced filters: Author: Michael F. A'Hearn Clear advanced filters

  • Internationally respected astronomer and renowned comet physics expert Michael Francis A’Hearn (1940–2017) passed away on 29 May 2017 at the age of 76.

    • Michael J. S. Belton
    Comments & Opinion
    Nature Astronomy
    Volume: 1, P: 644-645

  • Can the recent Discovery mission selections be used as tea leaves to understand the future directions of NASA? In an age of many programmes being used to advance administrative and programmatic goals, Discovery appears to be driven almost entirely by science and by NASA's goal of cheaper missions.

    • Michael F. A’Hearn
    Comments & Opinion
    Nature Astronomy
    Volume: 1, P: 1-2

  • In the Spitzer Space Telescope’s 16 years of operation, it observed many Solar System objects and environments. In this first Review Article of a pair, Spitzer’s insights into comets, centaurs and Kuiper belt objects—all remnants of the Solar System’s formation—are summarized.

    • Carey Lisse
    • James Bauer
    • Charles Woodward
    Reviews
    Nature Astronomy
    Volume: 4, P: 930-939

  • The ‘onion-like’ stratification of the two lobes of the comet 67P/Churyumov–Gerasimenko reveals that its unusual shape is the result of a gentle collision merging two kilometre-sized objects in the early stages of the Solar System.

    • Matteo Massironi
    • Emanuele Simioni
    • Jean-Baptiste Vincent
    Research
    Nature
    Volume: 526, P: 402-405

  • The size and spatial distribution of pits on comet 67P/Churyumov–Gerasimenko, which are active and probably created by a sinkhole process, imply that large heterogeneities exist in the physical, structural or compositional properties of the first few hundred metres below the current cometary surface.

    • Jean-Baptiste Vincent
    • Dennis Bodewits
    • Cecilia Tubiana
    Research
    Nature
    Volume: 523, P: 63-66

  • Detecting comets is of considerable practical interest, given the need to predict the hazards to Earth they may pose. A detection now comes from an unusual source, the SWAN system carried on a spacecraft. The comet was identified not from its emissions of visible light but from its ultraviolet Lyman-α radiation.

    • Michael F. A'Hearn
    News & Views
    Nature
    Volume: 405, P: 285-287

  • The Stardust mission has made the closest approach ever to a comet. Its ‘fly-through’ of the gas and dust surrounding Wild 2 presents a unique opportunity to investigate the evolution of such bodies.

    • Michael F. A'Hearn
    News & Views
    Nature
    Volume: 429, P: 818-819

  • Somatic histones are replaced with sperm-specific basic proteins, called protamines, during the chromatin remodelling phase of spermatogenesis. Here, the authors show that the chromatin remodelling protein Chd5 is required for histone-to-protamine replacement during spermatogenesis in mice.

    • Wangzhi Li
    • Jie Wu
    • Alea A. Mills
    Research
    Nature Communications
    Volume: 5, P: 1-15