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 and Roger Clowes
arxiv.org/abs/2604.17534
#Cosmology 🧪
NASA Rolls Out Artemis III Moon Rocket Core Stage
www.nasa.gov/news-release...
#Artemis
The Orion Integrity spacecraft afloat on the Pacific Ocean, backlit.
à contre-jour
Credit: NASA/Kevin Davis
images.nasa.gov/details/KSC-...
#Artemis
🧪🔭
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 and Roger Clowes
arxiv.org/abs/2604.17534
#Cosmology 🧪
Artemis III Moon Rocket Core Stage on its way of the assembly facility.
NASA moved the core stage, or the largest section, of the SLS (Space Launch System) rocket that will launch the crewed Artemis III mission in 2027 from the agency’s Michoud Assembly Facility to the agency’s Pegasus barge in New Orleans on April 20.
images.nasa.gov/details/MAF_... #Artemis
The Orion Integrity spacecraft afloat on the Pacific Ocean, backlit.
à contre-jour
Credit: NASA/Kevin Davis
images.nasa.gov/details/KSC-...
#Artemis
Title slide of the talk.
A schematic of Conformal Cyclic Cosmology.
Rings in Conformal Cyclic Cosmology.
#OxLancs2026
Sir Roger Penrose, at the 1st Ox & Lancs Colloquium on Cosmological Features on the Largest Scales at U. of Lancashire, takes us in the past aeons with his talk on Conformal Cyclic Cosmology, and an interpretation of Lopez giant rings.
www.star.uclan.ac.uk/ox-lancs-2026/ #Cosmology 🧪
Alexia Lopez, with first slide of her talk.
#OxLancs2026
Alexia Lopez, at the 1st Ox & Lancs Colloquium on Cosmological Features on the Largest Scales at U. of Lancashire, presents her new discovery: A Giant Ring on the Sky. Preprint should be on arXiv very soon, maybe tomorrow.
www.star.uclan.ac.uk/ox-lancs-2026/ #Cosmology 🧪
#OxLancs2026
Eleonora Di Valentino at the 1st Ox & Lancs Colloquium on Cosmological Features on the Largest Scales at U. of Lancashire, with an invited talk on Cracks in the Standard Cosmological Model: Anomalies, Tensions, and Hints of New Physics.
www.star.uclan.ac.uk/ox-lancs-2026/ #Cosmology 🧪
Title slide.
#OxLancs2026
Luciano Pietronero kicks off the 1st Ox & Lancs Colloquium on Cosmological Features on the Largest Scales at U. of Lancashire, with a talk on the fractal universe.
#Cosmology 🧪
🧪🔭
Thanks to the efforts of a member of our Editorial Board, we now have a Wikipedia page.
en.wikipedia.org/wiki/Open_Jo...
Got my copy and read your story first thing, loved it!
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. #Mars 🧪🔭
www.youtube.com/watch?v=wMnO...
Digitizing the Legacy of Women in Physics: Genesis Boykin and the Gloria Lubkin Papers
www.aip.org/foundation/d... ⚛️
@aiphistory.bsky.social @aip.bsky.social @physicstoday.aip.org
🌠New story day!🌠 I have a short, "Restoration", about a decaying property tycoon, a disillusioned historian, and the temptation to re-create what we cannot have again; in the new Galaxy mag! Along with @spacecowboybooks.bsky.social's interviews of @renanbernardo.com and @pedroiniguez.bsky.social
A cover of the Métal Hurlant magazine. Cover art features a scene inspired by the Dune universe with a character standing at the top of a dune, holding a container with green plants, watching a huge spaceship on the verge of collapsing in the distance.
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.
@metalhurlantoff.bsky.social
www.humano.com/album/37989
The cover of Galaxy Science Fiction issue number 264, the biggest issue of the magazine ever published. Cover art features a city floating on the clouds, with a nearby spheroidal object on the verge of destruction.
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
payhip.com/b/K3NcG 📚🪐💙
In August 1970, North American Rockwell proposed reversing the "Shuttle first, then Space Station" development order by launching a 6-person prototype station on a Saturn V in time for the 200th birthday of the USA. They called it "the Spirit of '76."
spaceflighthistory.blogspot.com/2015/10/an-a...
The NASA Minute: April 17, 2026
Artemis II is safely home, the X‑59 ramps up flight testing, Cygnus docks with the Space Station, and SPHEREx uncovers mysteries of the universe. 🧪🔭
Here’s what you need to know in your NASA Minute.
#Artemis #X59 #Cygnus #ISS #SPHEREx
The sunlight at dusk gently bathes the summit region of Maunakea in a soft gradient of colors. Above a sea of clouds, a group of telescopes can be seen, including the Subaru Telescope, the Keck I and II Telescopes, and the NASA Infrared Telescope Facility (IRTF).
The Summit of Maunakea at Dusk
Credit: Sebastian Egner/NAOJ
subarutelescope.org/en/gallery/f...
🔭 #Maunakea
Quand des gouttes sur un film de savon permettent de comprendre la formation des galaxies
Des physiciens français ont réussi à reproduire l’intégralité de la dynamique à l’œuvre lorsque des galaxies se rapprochent et fusionnent. 🧪🔭
☑️ www.lemonde.fr/sciences/art...
☑️ doi.org/10.1093/pnas...
The cover of Galaxy Science Fiction issue number 264, the biggest issue of the magazine ever published. Cover art features a city floating on the clouds, with a nearby spheroidal object on the verge of destruction.
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
payhip.com/b/K3NcG 📚🪐💙
This NOIRLab Image of the Week of the Small Magellanic Cloud (SMC) was not taken with a telescope! It was instead captured using a camera and a wide-aperture telephoto lens. It was taken by Petr Horálek, a NOIRLab Audiovisual Ambassador. Petr captured this special image for almost four hours during a night spent under clear skies on Cerro Pachón in Chile. Cerro Pachón is a mountain in the foothills of Chile’s Andes range. Northern Chile offers some of the clearest, driest, and darkest skies in the world. These conditions create ample opportunities for astrophotography and for addressing some of our biggest questions about the Universe. The summit of Cerro Pachón is home to several telescopes operated by NSF NOIRLab including the SOAR Telescope, a part of the U.S. National Science Foundation (NSF) Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF NOIRLab; Gemini South, one half of the International Gemini Observatory, funded in part by the NSF; and NSF–DOE Vera C. Rubin Observatory, which is jointly funded by the NSF and the U.S. Department of Energy Office of Science (DOE/SC). The Small Magellanic Cloud and Large Magellanic Cloud (LMC) are the largest of the 60+ satellite galaxies of the Milky Way. Satellite galaxies orbit around a host galaxy and are usually smaller than their host galaxy. The SMC was once even a satellite galaxy of the LMC! Unlike most of the other satellite galaxies of the Milky Way, the SMC is actively forming stars at a rapid pace, a process revealed by the blue light in this image. Petr similarly captured the LMC from Cerro Pachón as an earlier NSF NOIRLab Image of the Week.
NOIRLab image of the week
The Small Magellanic Cloud from Cerro Pachón
Credit: NOIRLab/NSF/AURA/P. Horálek (Institute of Physics in Opava)
noirlab.edu/public/image... 🧪🔭
The NASA Minute: April 17, 2026
Artemis II is safely home, the X‑59 ramps up flight testing, Cygnus docks with the Space Station, and SPHEREx uncovers mysteries of the universe. 🧪🔭
Here’s what you need to know in your NASA Minute.
#Artemis #X59 #Cygnus #ISS #SPHEREx
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. 🧪🔭 #Voyager
science.nasa.gov/blogs/voyage...
