Bon-Chul Koo, Seoul National University; Yong-Hyun Lee, Korea Astronomy and Space Science Institute; Hyun-Jeong Kim, Kyung Hee University

Read the June issue

This month we look at radio emission from a quiescent red dwarf, the dynamic warping of our Galaxy, lessons to be learned from LIGO/Virgo's third observation run, and much more...

Latest Research

  • Letter |

    The oxygen emission at 557.7 nm, responsible for the green colour of auroras on Earth, is present in two layers at 80 and 120 km altitude on the dayside atmosphere of Mars. Simultaneous observations of the oxygen both in this visible line and in the ultraviolet could also constrain the elusive visible/ultraviolet intensity ratio of the auroral emission to a value of 16.5.

    • J.-C. Gérard
    • , S. Aoki
    • , Y. Willame
    • , L. Gkouvelis
    • , C. Depiesse
    • , I. R. Thomas
    • , B. Ristic
    • , A. C. Vandaele
    • , F. Daerden
    • , B. Hubert
    • , J. Mason
    • , M. R. Patel
    • , J.-J. López-Moreno
    • , G. Bellucci
    • , M. A. López-Valverde
    •  & B. Beeckman
  • Letter |

    Titan is migrating away from Saturn on a much shorter timescale than expected, lending support to the resonance-locking tidal theory. This result motivates a revision of the evolutionary history of Saturn’s moon system and may be relevant to other giant planets.

    • Valéry Lainey
    • , Luis Gomez Casajus
    • , Jim Fuller
    • , Marco Zannoni
    • , Paolo Tortora
    • , Nicholas Cooper
    • , Carl Murray
    • , Dario Modenini
    • , Ryan S. Park
    • , Vincent Robert
    •  & Qingfeng Zhang
  • Article |

    Two sources of variability are reported in extreme horizontal branch (EHB) stars found in globular clusters, both related to the action of weak magnetic fields: large surface spots and very energetic flares. EHB stars in clusters can thus be linked to EHB field stars, and beyond, to other stars with radiative envelopes.

    • Y. Momany
    • , S. Zaggia
    • , M. Montalto
    • , D. Jones
    • , H. M. J. Boffin
    • , S. Cassisi
    • , C. Moni Bidin
    • , M. Gullieuszik
    • , I. Saviane
    • , L. Monaco
    • , E. Mason
    • , L. Girardi
    • , V. D’Orazi
    • , G. Piotto
    • , A. P. Milone
    • , H. Lala
    • , P. B. Stetson
    •  & Y. Beletsky
  • Article |

    Galactic close encounters can induce gravitational effects in the participants. Here Ruiz-Lara et al. have reconstructed the star formation history of the region of our Galaxy close to the Sun, finding that three recent visits of the neighbouring Sagittarius dwarf galaxy have resulted in well-defined episodes of star formation.

    • Tomás Ruiz-Lara
    • , Carme Gallart
    • , Edouard J. Bernard
    •  & Santi Cassisi
  • Article |

    Different plasma modes in various Galactic environments are identified on the basis of a synchrotron polarization analysis. These results open up the study of interstellar turbulence and demonstrate its importance in all relevant processes including cosmic ray transport and star formation.

    • Heshou Zhang
    • , Alexey Chepurnov
    • , Huirong Yan
    • , Kirit Makwana
    • , Reinaldo Santos-Lima
    •  & Sarah Appleby

News & Comment

  • Comment |

    The historic launch of the first several hundred out of 12,000 planned Starlink satellites heralds the arrival of the era of ultra-large satellite constellations. If it will bring new opportunities or insurmountable challenges to astronomy will probably depend on whether you are conducting your observations in space or from the surface of the Earth.

    • Igor Levchenko
    • , Shuyan Xu
    • , Yue-Liang Wu
    •  & Kateryna Bazaka
  • Obituary |

    On 3 May 2020 the Greek and extended international astronomy community lost Professor Emeritus John Hugh Seiradakis, a highly impactful, wide-reaching researcher and educator, and mentor to generations of students.

    • Vassiliki Kalogera
    •  & Michael Kramer
  • Obituary |

    The space and planetary science community lost a great leader, Professor Weixing Wan, on 20 May 2020, aged 62. He was a world-leading space scientist and a pioneer in China’s planetary science programme.

    • Yong Wei
  • Editorial |

    On the anniversary of ROSAT’s launch, we reflect on the relevance and promise of X-ray observations in all fields of astronomy. Properly laying out a plan for the future of the field will allow it to continue flourishing.

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