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Volume 2 Issue 3, March 2018

Volume 2 Issue 3

A window to the Martian past

Phyllosilicates (clays) on Mars, such as the light—toned outcrops at Mawrth Vallis shown on the cover, could form during warm and wet intermittent periods in a generally cold early Mars. This model solves the contradiction on the state of ancient Mars between mineralogical and geomorphological observations and the most accepted climate theories.

See Bishop et al. and News & Views by Bridges

Image: Christoph Gross, Freie Universität Berlin. Cover Design: Bethany Vukomanovic.

Editorial

  • Editorial |

    Galaxies hosting actively accreting supermassive black holes make up roughly 10% of all galaxies in the Universe. Nevertheless, due to their immense energy output, active galactic nuclei are widely regarded as regulators of their host galaxy growth. But does observational evidence stack up?

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News & Views

  • News & Views |

    A peak in the infrared phase curve occurring after eclipse suggests a westward shift in the dayside hotspot of hot giant exoplanet CoRoT-2b, calling into question our understanding of atmospheric dynamics on hot gas giants.

    • Joanna K. Barstow
  • News & Views |

    A new geochemical study shows that short-lived warm and wet episodes during a globally cold early Mars could have formed the clay deposits detected on the Martian surface. This model can reconcile climate models with mineralogical and geomorphological evidence.

    • John C. Bridges
  • News & Views |

    One of the astrophysical sources that gives rise to the mysterious transients known as fast radio bursts is embedded in a highly magnetized environment, such as the vicinity of an accreting massive black hole or the birth nebula of a highly magnetized neutron star.

    • Brian D. Metzger
  • Meeting Report |

    Feedback from active galactic nuclei (AGNs) remains controversial despite its wide acceptance as necessary to regulate massive galaxy growth. Consequently, we held a workshop in October 2017, at Leiden’s Lorentz Center, to distinguish between the reality and myths of feedback.

    • Bernd Husemann
    • Chris M. Harrison

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