Cosmographer at University Paris-Saclay | co-discoverer of Laniakea (our home supercluster), Ho'oleilana, and some other (very) large scale structures 🌌 🔭 💻
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ALT An artist's view of Ho'oleilana. The three-dimensional shell enclosed by the Baryon Acoustic Oscillation is colorized in reddish/orange/brown color and enhanced to capture its content in terms of galaxies and to expose how it is encapsulated in the larger structure of the Cosmic Web. Galaxies are shown as luminous tiny specks. The Cosmic Web is represented as the blueish filamentary maze. This view also exposes the other structures discovered by the Cosmicflows research program: Laniakea our Home supercluster of galaxies; the South Pole Wall, a giant filament of the cosmic web that embraces the sourthernmost frontiers of Laniakea; the Dipole Repeller and the Cold Spot Repeller, two underdense regions presumably associated to two giant cosmic voids. Credits: Frédéric Durillon, Animea Studio; Daniel Pomarède, IRFU, CEA University Paris-Saclay. This work benefited from a government funding by France 2030 (P2I - Graduate School of Physics) under reference ANR-11-IDEX-0003.
ALT The front cover of Worlds of IF #180, featuring "Butterfly Effect" by Katerina Belikova a.k.a. Ninja Jo. Art features a robot and a butterfly staring at each other. Two lines of text reads "COLOSSAL 180th MEGA ISSUE!!!" and "Celebrating 74 years of the best science fiction!"
ALT Back cover featuring fantasy space art "Laura's New Cadillac" by Bruce Pennington and contributors list.
ALT Poster with a peach-and-gold background that reads “Journey to Titan” in bold orange text, with a banner beneath it that says “Fly your name to another world!” Below the headline, NASA’s Dragonfly rotorcraft flies through a hazy sky with its rotors spinning, with faint hexagon patterns in the background.
ALT A grey scale image capturing Mars' moon Phobos. This image was taken by Mast Camera (Mastcam) onboard NASA's Mars rover Curiosity on Sol 5054 (2026-10-25 08:54:28 UTC).
ALT A partial view of the orange core stage of the Artemis III rocket standing between two white solid rocket boosters inside of the VAB. The rocket spans several stories. Platforms on each floor surround the rocket. There are railings and equipment on every level. Credit: NASA/Sean Cannon
ALT Two employees in hard hats look up as a crane lifts the 212-foot core stage of the Artemis III rocket vertically into the transfer aisle of the VAB. Dominating the center of the image are four rocket engines on the bottom of the core stage. They are covered in red caps. Credit: NASA/Sean Cannon
ALT The bottom half of the orange core stage of the Artemis III rocket is suspended vertically in High Bay 3 of the VAB as a crane moves it into place above the mobile launcher. Several levels of observation platforms are visible behind the core stage and one of the solid rocket boosters is seen below. Credit: NASA/Sean Cannon
ALT The orange core stage of the Artemis III rocket is suspended vertically in the transfer aisle as a crane moves it into High Bay 3 of the VAB. Several levels of observation platforms are visible behind the core stage. Credit: NASA/Sean Cannon
ALT Figure displaying the frequency functions of the number of galaxies per unit surface area of the sky for the Hubble's observed distribution and for the theoretical assumption that galaxies are distributed at random. Below the figure is laid out the finding of the paper: "We can scarcely escape the conclusion that a widespread tendency towards clustering among galaxies is one of the chief characteristics of our universe." Signed Bart J. Bok, Harvard Observatory, Cambridge, Mass., Jan. 27.
ALT The H3F10 launch vehicle carrying the MMX spacecraft starts to rise from the launch pad.
ALT The H3F10 launch vehicle carrying the MMX spacecraft soars into the sky.
