Mastodawn

Takový malý přehled toho, co nám už přistálo nebo spadlo na Marsu (cizozemcům se omlouvám, že tentokrát je to jenom v češtině) :)

Grafika v originálním rozlišení https://drive.google.com/file/d/1kJaDt3gB6VLX7BGLOrwEhpNsIf99hv6x/view?usp=sharing

Jackie Branc 1d ago

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Daniel Pomarède 2d ago

Cosmography alert 🚨

Discovery of a Giant Ring on the Sky, a ring-like, ultra-large-scale structure at z~0.8, located in the same field that contains the previously-documented Giant Arc and Big Ring.

By Alexia Lopez @morninglopez and Roger Clowes @rgclowes
https://arxiv.org/abs/2604.17534

#Cosmology #GiantRing #galaxies #Cosmography #science #news #AlexiaLopez #RogerClowes #ULancashire #OxLancs2026 #astrodon

A Giant Ring on the sky

We present the discovery of `A Giant Ring on the Sky' (GR); a ring-like, ultra-large-scale structure at z~0.8, located in the same field that contains the previously-documented Giant Arc (GA) and Big Ring (BR). The GR was predicted from the presence of a Northern Arc (NA) filament (noted in previous work), which looked like it could, with more or enhanced data, connect with the GA to form a giant ring that encompasses the BR. There is now much evidence to support the reality of a GR. There appear to be two overlapping versions of the GR which differ by only the left-hand-side trajectory; this branching in the LHS of the GR was identified with the FilFinder algorithm and appears to correspond to both the GR prediction (the extended, elliptical, GR from the GA+NA ellipse), and the visually-identified ellipse (the visually-impressive, almost contiguous, roughly circular, GR which is enhanced by a tilted viewing angle). The branching in the GR seems to be hinting at multiple, overlapping ring features. The GR consists of a thin, filamentary northern region, a clustered, ambiguous southern region (including the members of the GA), and filamentary branching towards the LHS. Statistical assessment with elliptical shells, and optimum elliptical-shell-matching, identified two $> 4σ$ ellipse features corresponding to the GR prediction and to the visually-identified GR. Additionally, the 2D Power Spectrum Analysis identified significant ($3.5 σ$) clustering on scales ~320Mpc. We also applied our statistical assessments to random data and to FLAMINGO-10K simulated data. The results demonstrate that, while superficially `significant' elliptical shells can be reproduced in random data with the optimum ellipse-matching method (many trials giving the `look-elsewhere' effect), with 2D PSA all of the random fields, and FLAMINGO-10K fields, were found to be entirely consistent with random.

arXiv.org

Jackie Branc 1d ago

Daniel Pomarède 1d ago

#OxLancs2026

Final slide of my talk this morning at the First Ox & Lancs Colloquium on Cosmological Features on the Largest Scales, held at the University of Lancashire: a recap of the discoveries of the Cosmicflows program.

https://www.star.uclan.ac.uk/ox-lancs-2026/

#Cosmology #Laniakea #DipoleRepeller #ColdSpotRepeller #SouthPoleWall #Hooleilana #SloanBasinOfAttraction #cosmography #cosmicflows #astrodon

Jackie Branc 3d ago

Daniel Pomarède 3d ago

Martian Memories

Five years ago on this day, April 19, 2021, first flight of Ingenuity, the little Mars Helicopter, at Van Zyl Overlook in Jezero Crater. The historic moment is captured by Perseverance with her Mastcam Zoom camera.

https://www.youtube.com/watch?v=wMnOo2zcjXA

#Mars #Ingenuity #Perseverance #space #helicopter #history #science #historyOfScience #Jezero #VanZylOverlook #OTD

First Video of NASA’s Ingenuity Mars Helicopter in Flight, Includes Takeoff and Landing (High-Res)

YouTube

Jackie Branc 4d ago

Daniel Pomarède 5d ago

Galaxy Science Fiction #264

This is the 2nd issue since the revival of the historic magazine by Starship Sloane Publishing. I'm on board as science editor and author with a short essay: “A Three-Dimensional Chessboard Universe”.

Cover art: Broken Sky, by Marianne Plumridge

https://payhip.com/b/K3NcG

#scifi #sciencefiction #GalaxySF #StarshipSloane #news #reading #readers #cosmography

Jackie Branc 4d ago

Daniel Pomarède 4d ago

Wow what a fantastic cover for the forthcoming issue of Métal Hurlant. Theme: "Once Upon a Time in the Desert". Dune art by Emem. Interviews of Denis Villeneuve and Alejandro Jodorowsky.

https://www.humano.com/album/37989

#MétalHurlant #Dune #scifi #sciencefiction #DenisVilleneuve #AlejandroJodorowsky #desert #déserts #cover #art #coverart #Emem

Jackie Branc 5d ago

Daniel Pomarède 5d ago

NASA Shuts Off Instrument on Voyager 1 to Keep Spacecraft Operating

The Low-energy Charged Particles experiment has been operating almost without interruption since Voyager 1 launched in 1977 - almost 49 years.

https://science.nasa.gov/blogs/voyager/2026/04/17/nasa-shuts-off-instrument-on-voyager-1-to-keep-spacecraft-operating/

#Voyager #science #news #space #spacecraft #astrodon

NASA Shuts Off Instrument on Voyager 1 to Keep Spacecraft Operating

On April 17, engineers at NASA’s Jet Propulsion Laboratory (JPL) in Southern California sent commands to shut down an instrument aboard Voyager 1 called the

NASA Science

Jackie Branc 5d ago