Stephen A. Walker/ NASA Goddard Space Flight Center

Read our April issue

We go into the laboratory to study exoplanet hazes, then out to the cold front around the Perseus cluster and onwards to individual stars and transient events magnified by distant galaxy clusters. 

Latest Research

  • Letter |

    Α combined study of spatially resolved stellar kinematics and global stellar populations with the SAMI Galaxy Survey finds a strong correlation between the characteristic stellar population age of a galaxy and its intrinsic ellipticity.

    • Jesse van de Sande
    • , Nicholas Scott
    • , Joss Bland-Hawthorn
    • , Sarah Brough
    • , Julia J. Bryant
    • , Matthew Colless
    • , Luca Cortese
    • , Scott M. Croom
    • , Francesco d′Eugenio
    • , Caroline Foster
    • , Michael Goodwin
    • , Iraklis S. Konstantopoulos
    • , Jon S. Lawrence
    • , Richard M. McDermid
    • , Anne M. Medling
    • , Matt S. Owers
    • , Samuel N. Richards
    •  & Rob Sharp
  • Article |

    Ground-based near-infrared spectra of Uranus detected hydrogen sulfide (H2S) above the main cloud deck (at a pressure of 1.2–3 bar), suggesting that the bulk sulfur/nitrogen ratio in Uranus’s atmosphere exceeds unity and that the clouds are dominated by H2S ice.

    • Patrick G. J. Irwin
    • , Daniel Toledo
    • , Ryan Garland
    • , Nicholas A. Teanby
    • , Leigh N. Fletcher
    • , Glenn A. Orton
    •  & Bruno Bézard
  • Letter |

    The authors predict the ability of the Event Horizon Telescope (in its 2017 campaign) to distinguish between different theories of gravity based on images of Sagittarius A*; they suggest that it will not be possible.

    • Yosuke Mizuno
    • , Ziri Younsi
    • , Christian M. Fromm
    • , Oliver Porth
    • , Mariafelicia De Laurentis
    • , Hector Olivares
    • , Heino Falcke
    • , Michael Kramer
    •  & Luciano Rezzolla
  • Letter |

    Iron has been ramp compressed to the pressures it would experience in the core of a 3–4 Earth-mass terrestrial exoplanet, providing experimental constraints on the mass–radius relationship for a hypothetical pure iron planet.

    • Raymond F. Smith
    • , Dayne E. Fratanduono
    • , David G. Braun
    • , Thomas S. Duffy
    • , June K. Wicks
    • , Peter M. Celliers
    • , Suzanne J. Ali
    • , Amalia Fernandez-Pañella
    • , Richard G. Kraus
    • , Damian C. Swift
    • , Gilbert W. Collins
    •  & Jon H. Eggert
  • Article |

    How does Titan’s thick brownish haze chemically evolve as it is transported from the upper atmosphere observed by Cassini to the lower regions sampled by Huygens? Laboratory vacuum ultraviolet experiments may explain the observed changes in nitrogen chemistry.

    • Nathalie Carrasco
    • , Sarah Tigrine
    • , Lisseth Gavilan
    • , Laurent Nahon
    •  & Murthy S. Gudipati
  • Letter |

    Cosmic filaments evolve nonlinearly from density fluctuations produced in the primordial Universe. Detection of cosmic microwave background lensing by filaments allows the measurement of how filaments trace the matter distribution on large scales.

    • Siyu He
    • , Shadab Alam
    • , Simone Ferraro
    • , Yen-Chi Chen
    •  & Shirley Ho

News & Comment

  • News & Views |

    Hydrogen sulfide gas is detected above Uranus’s main cloud deck, confirming the prevalence of H2S ice particles as the main cloud component and a strongly unbalanced nitrogen/sulfur ratio in the planet's deep atmosphere.

    • Imke de Pater
  • News & Views |

    Observations of two sequences of blue stragglers in a young, sparse star cluster in the Large Magellanic Cloud re-opens the debate about the dominant formation mechanism of these anomalous stars.

    • Alison Sills
  • News & Views |

    Recently, large integral-field spectroscopic studies of galaxies have greatly increased our knowledge of their structure and evolution. A new analysis of such data reveals a relationship between the age and the intrinsic — three-dimensional — shape of galaxies.

    • Anne-Marie Weijmans