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 |

    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
  • Article |

    An individual star at z = 1.49 is gravitationally lensed and highly magnified by a foreground galaxy cluster. Fluctuations in the star’s emission provide insight on the mass function of intracluster stars, compact objects and the presence of dark-matter subhaloes.

    • Patrick L. Kelly
    • , Jose M. Diego
    • , Steven Rodney
    • , Nick Kaiser
    • , Tom Broadhurst
    • , Adi Zitrin
    • , Tommaso Treu
    • , Pablo G. Pérez-González
    • , Takahiro Morishita
    • , Mathilde Jauzac
    • , Jonatan Selsing
    • , Masamune Oguri
    • , Laurent Pueyo
    • , Timothy W. Ross
    • , Alexei V. Filippenko
    • , Nathan Smith
    • , Jens Hjorth
    • , S. Bradley Cenko
    • , Xin Wang
    • , D. Andrew Howell
    • , Johan Richard
    • , Brenda L. Frye
    • , Saurabh W. Jha
    • , Ryan J. Foley
    • , Colin Norman
    • , Marusa Bradac
    • , Weikang Zheng
    • , Gabriel Brammer
    • , Alberto Molino Benito
    • , Antonio Cava
    • , Lise Christensen
    • , Selma E. de Mink
    • , Or Graur
    • , Claudio Grillo
    • , Ryota Kawamata
    • , Jean-Paul Kneib
    • , Thomas Matheson
    • , Curtis McCully
    • , Mario Nonino
    • , Ismael Pérez-Fournon
    • , Adam G. Riess
    • , Piero Rosati
    • , Kasper Borello Schmidt
    • , Keren Sharon
    •  & Benjamin J. Weiner

News & Comment

  • Editorial |

    The proposed NASA budget promotes space exploration over science, and planetary science over astrophysics. This decision has the potential to cause strife between scientists, who have to work together to find a solution.