#planet-9 — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #planet-9, aggregated by home.social.
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MÝA REVISITS FUNK ROOTS WITH 'RETROSPECT' ALBUM
Singer Mýa releases her new album 'Retrospect' this spring, blending 70s-80s funk with modern R&B. Find out who she is working with.
#MyaRetrospect, #NewMusic, #FunkRevival, #RNB, #Planet9
https://newsletter.tf/mya-new-album-retrospect-funk-r-and-b-release/
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Mýa's new album 'Retrospect' is her first in 8 years, mixing classic funk with new artists like 21 Savage.
#MyaRetrospect, #NewMusic, #FunkRevival, #RNB, #Planet9
https://newsletter.tf/mya-new-album-retrospect-funk-r-and-b-release/ -
Weekly Update from the Open Journal of Astrophysics – 10/01/2026
Welcome to the first proper update for 2026 from the Open Journal of Astrophysics. The New Year brings us to Volume 9. In many countries, especially in Europe, Christmas is celebrated on January 6th so this week was also affected by the holiday season. Nevertheless, since the last update we have published four papers, bringing the number in Volume 9 (2026) to 4 and the total so far published by OJAp up to 452.
The first paper this week (and of course the first of 2026) is “A targeted, parallax-based search for Planet Nine” by Hector Socas-Navarro and Ignacio Trujillo (both of the Instituto de Astrofísica de Canaria, Spain). This article describes a targeted search for the hypothesized Planet Nine in the outer solar system, using parallax position shifts. No credible candidates were found within the observed field. It was published on Tuesday January 6th in the folder Earth and Planetary Astrophysics. The overlay is here:
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
https://fediscience.org/@OJ_Astro/115847068676034973
The second paper is “Going beyond S8: fast inference of the matter power spectrum from weak-lensing surveys” by Cyrille Doux (Université Grenoble Alpes, France) and Tanvi Karwal (U. Chicago, USA). This was published on Wednesday January 7th in the folder Cosmology and Nongalactic Astrophysics and it presents a new framework to extract the scale-dependent matter power spectrum from cosmic shear and CMB lensing measurements, revealing a consistent suppression in the matter power spectrum in galaxy-lensing. The overlay is here:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
https://fediscience.org/@OJ_Astro/115853112748106265
Next we have “Constraining the Stellar-to-Halo Mass Relation with Galaxy Clustering and Weak Lensing from DES Year 3 Data” which is led by G. Zacharegkas et al. (Argonne National Laboratory, USA) and has 102 other authors too numerous to list by name from many institutions around the world again too numerous to list by name. It presents a framework to analyze the relationship between a galaxy’s stellar mass and its dark matter halo mass, using data from the Dark Energy Survey. The findings align with previous results. This paper was published on Thursday January 8th in the folder Astrophysics of Galaxies. The overlay is here:
The official version can be found on arXiv here and the Fediverse announcement is here:
https://fediscience.org/@OJ_Astro/115858972601709198
Finally for this week we have “Distance measurements from the internal dynamics of globular clusters: Application to the Sombrero galaxy (M 104)” by Katja Fahrion (University of Vienna, Austria) and 9 others based in Spain, Australia, UK, USA, Brazil, Germany and Switzerland. This was published on Friday 9th January (yesterday) in the folder Astrophysics of Galaxies. This study uses the globular cluster velocity dispersion method to measure the distance to the Sombrero galaxy, finding it to be approximately 9.0 Mpc away. The overlay is here:
The officially accepted version can be found on arXiv here and the Fediverse announcement here:
https://fediscience.org/@OJ_Astro/115864438724623861
That concludes the update for this week. I will do another next Saturday.
#arXiv250405473v2 #arXiv250616434v3 #arXiv250622367v3 #AstrophysicsOfGalaxies #CosmologyAndNonGalacticAstrophysics #DarkEnergySurvey #DES #DiamondOpenAccess #DiamondOpenAccessPublishing #EarthAndPlanetaryAstrophysics #galaxyClustering #galaxyHalo #OpenAccess #OpenAccessPublishing #OpenJournalOfAstrophysics #Planet9 #PowerSpectrum #StellarMass #TheOpenJournalOfAstrophysics #weakGravitationalLensing
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#arXiv #Planet9 Measuring the Mean Plane of the Distant Kuiper Belt https://arxiv.org/abs/2508.14156 a warp relative to the invariable plane at semimajor axes of 80-400 AU (98% confidence) and 80-200 AU (96% confidence), but not at 50-80 AU or 200-400 AU.
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#arXiv #Planet9 Measuring the Mean Plane of the Distant Kuiper Belt https://arxiv.org/abs/2508.14156 a warp relative to the invariable plane at semimajor axes of 80-400 AU (98% confidence) and 80-200 AU (96% confidence), but not at 50-80 AU or 200-400 AU.
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A ‘Warp’ In Our #SolarSystem Might Be an Undiscovered World: #PlanetY
In addition to #PlanetNine, the solar system may also contain a closer, smaller world that could be spotted soon.
The newly proposed planet, assuming it exists, is predicted to be somewhere between Mercury and Earth in scale, which would likely make it detectable within the next few years. It is distinct from #Planet9 or #PlanetX, much larger and more distant than #Planet Y.
https://www.404media.co/a-warp-in-our-solar-system-might-be-an-undiscovered-world-planet-y/
https://archive.ph/9Xj6A -
A ‘Warp’ In Our #SolarSystem Might Be an Undiscovered World: #PlanetY
In addition to #PlanetNine, the solar system may also contain a closer, smaller world that could be spotted soon.
The newly proposed planet, assuming it exists, is predicted to be somewhere between Mercury and Earth in scale, which would likely make it detectable within the next few years. It is distinct from #Planet9 or #PlanetX, much larger and more distant than #Planet Y.
https://www.404media.co/a-warp-in-our-solar-system-might-be-an-undiscovered-world-planet-y/
https://archive.ph/9Xj6A -
The hunt for ‘planet nine’: why there could still be something massive at the edge of the Solar System
#Astronomy #Pluto #Neptune #Planet9 #SolarSystem #KuiperBelt #SpaceDiscovery #PlanetX #OuterSpace #Astrophysics #NASA #Sednoid #SpaceExploration
https://the-14.com/the-hunt-for-planet-nine-why-there-could-still-be-something-massive-at-the-edge-of-the-solar-system/ -
The hunt for ‘planet nine’: why there could still be something massive at the edge of the Solar System
#Astronomy #Pluto #Neptune #Planet9 #SolarSystem #KuiperBelt #SpaceDiscovery #PlanetX #OuterSpace #Astrophysics #NASA #Sednoid #SpaceExploration
https://the-14.com/the-hunt-for-planet-nine-why-there-could-still-be-something-massive-at-the-edge-of-the-solar-system/ -
Japanisches #Subaru-Teleskop hat mit Ammonite erst den vierten bekannten Sednoid jenseits der Neptun-Umlaufbahn entdeckt. Seine ungewöhnliche Bahn könnte auf die Existenz des hypothetischen #Planet9 hindeuten. https://winfuture.de/news,152374.html?utm_source=Mastodon&utm_medium=ManualStatus&utm_campaign=SocialMedia
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Japanisches #Subaru-Teleskop hat mit Ammonite erst den vierten bekannten Sednoid jenseits der Neptun-Umlaufbahn entdeckt. Seine ungewöhnliche Bahn könnte auf die Existenz des hypothetischen #Planet9 hindeuten. https://winfuture.de/news,152374.html?utm_source=Mastodon&utm_medium=ManualStatus&utm_campaign=SocialMedia
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[video] Astronomers discover a 4th sednoid in our Solar System. Ammonite, the “new” cosmic “fossil,” questions the entire theory about the hypothetical Planet 9.
https://www.news-cafe.eu/?go=news&n=13714
#sednoid #planet9 #planetnine #solarsystem #space #cosmos #universe #research #science #astronomy -
Evidence of controversial #Planet9 uncovered in sky surveys taken 23 years apart
If the object really is #PlanetNine, it would be larger than Neptune and exist 700 times further from the sun than Earth.
Planet Nine was put forward in 2016 by Michael Brown and Konstantin Batygin of the California Institute of Technology to explain an unusual bunching of orbits of some objects in the #KuiperBelt, such as #Sedna.
https://www.space.com/astronomy/solar-system/evidence-of-controversial-planet-9-uncovered-in-sky-surveys-taken-23-years-apart -
Evidence of controversial #Planet9 uncovered in sky surveys taken 23 years apart
If the object really is #PlanetNine, it would be larger than Neptune and exist 700 times further from the sun than Earth.
Planet Nine was put forward in 2016 by Michael Brown and Konstantin Batygin of the California Institute of Technology to explain an unusual bunching of orbits of some objects in the #KuiperBelt, such as #Sedna.
https://www.space.com/astronomy/solar-system/evidence-of-controversial-planet-9-uncovered-in-sky-surveys-taken-23-years-apart -
Our Weekly Update #26 is live! 🎥✨
Watch now: https://youtu.be/dTSgOZhiuEs
Don’t forget to subscribe & hit the bell 🔔!Subscribe to our weekly newsletter!
👉 https://urlroulette.net/newsletter/subscribeform 🚀 -
Forscher haben ein extremes Objekt am Rand des #Sonnensystems entdeckt: 2017 OF201 hat 700 km Durchmesser und eine stark gestreckte Bahn. Ein Umlauf dauert 25.000 Jahre. Dieser Fund stellt die Theorie des #Planet9 infrage. https://winfuture.de/news,151127.html?utm_source=Mastodon&utm_medium=ManualStatus&utm_campaign=SocialMedia
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Forscher haben ein extremes Objekt am Rand des #Sonnensystems entdeckt: 2017 OF201 hat 700 km Durchmesser und eine stark gestreckte Bahn. Ein Umlauf dauert 25.000 Jahre. Dieser Fund stellt die Theorie des #Planet9 infrage. https://winfuture.de/news,151127.html?utm_source=Mastodon&utm_medium=ManualStatus&utm_campaign=SocialMedia
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As one avenue to Planet 9 closes so another one could open, this latest object will help some theories while quash others, such is the beauty of Science.
And do not anthropomorphise Pluto, it's just a minor planet, not a sad puppy being demoted.https://cosmiclog.com/2025/05/22/a-cousin-for-pluto-new-dwarf-planet-candidate-found/
#KuiperBelt #MinorPlanets #2017OF201 #Planet9 #Astronomy #Space
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As one avenue to Planet 9 closes so another one could open, this latest object will help some theories while quash others, such is the beauty of Science.
And do not anthropomorphise Pluto, it's just a minor planet, not a sad puppy being demoted.https://cosmiclog.com/2025/05/22/a-cousin-for-pluto-new-dwarf-planet-candidate-found/
#KuiperBelt #MinorPlanets #2017OF201 #Planet9 #Astronomy #Space
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Add another potential dwarf #planet to the list for our solar system - and this one challenges claims relating to the hypothetical existence of a large world known as #PlanetX or #Planet9 ... https://cosmiclog.com/2025/05/22/a-cousin-for-pluto-new-dwarf-planet-candidate-found/ #2017OF201 #PlanetNine #Space #DwarfPlanet
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Add another potential dwarf #planet to the list for our solar system - and this one challenges claims relating to the hypothetical existence of a large world known as #PlanetX or #Planet9 ... https://cosmiclog.com/2025/05/22/a-cousin-for-pluto-new-dwarf-planet-candidate-found/ #2017OF201 #PlanetNine #Space #DwarfPlanet
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While it's not confirmed at all, there's evidence of something that could be #planet9 from two sources 23 years apart https://arxiv.org/pdf/2504.17288 #space #planet
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#AntonPetrov - Planet 9 Discovered? Scientists Find Strange Slow Moving Object #science #planet9 - https://www.youtube.com/watch?v=kc-3bHa14w4
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This is interesting! Possible Planet 9 candidate found in two far-infrared sky surveys; IRAS (1983) and AKARI (2006). Obviously this is not a confirmation and more observations are needed to confirm it. But sounds promising! #Planet9 https://www.space.com/astronomy/solar-system/evidence-of-controversial-planet-9-uncovered-in-sky-surveys-taken-23-years-apart
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This is interesting! Possible Planet 9 candidate found in two far-infrared sky surveys; IRAS (1983) and AKARI (2006). Obviously this is not a confirmation and more observations are needed to confirm it. But sounds promising! #Planet9 https://www.space.com/astronomy/solar-system/evidence-of-controversial-planet-9-uncovered-in-sky-surveys-taken-23-years-apart
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As this year progresses, the @VRubinObs 🔭 will start building up a baseline picture of the sky, and by the end of the year it should have started detecting changes and making that data available to the #astronomy community.
At that point, we can get serious about trying to find #Planet9 🌌 https://www.ksfr.org/npr-news/2025-04-09/if-planet-nine-is-out-there-this-telescope-might-actually-find-it
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As this year progresses, the @VRubinObs 🔭 will start building up a baseline picture of the sky, and by the end of the year it should have started detecting changes and making that data available to the #astronomy community.
At that point, we can get serious about trying to find #Planet9 🌌 https://www.ksfr.org/npr-news/2025-04-09/if-planet-nine-is-out-there-this-telescope-might-actually-find-it
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Astronomers identify first 'good' candidate for controversial Planet Nine deep in our solar system
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Astronomers identify first 'good' candidate for controversial Planet Nine deep in our solar system
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Took astronomers 23 years to spot it? This planet's hide-and-seek game is legendary! 🌌
Scientists may have found Planet 9 lurking in old infrared surveys - a massive world bigger than Neptune, chilling about 700x further from the Sun than Earth.
Now they just need to find where it wandered off to since 2006... 🔭
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Nyt peukut varpaita myöten pystyyn! Olisi taas komea juttu minun elinaikanani tapahtuvaksi. #Planet9 #planeetta9 #tähtitiede
https://www.avaruus.fi/index.php?id=14686 -
Nyt peukut varpaita myöten pystyyn! Olisi taas komea juttu minun elinaikanani tapahtuvaksi. #Planet9 #planeetta9 #tähtitiede
https://www.avaruus.fi/index.php?id=14686 -
Die Feiertagspause ist vorbei und Franzi erzählt, wie Pluto als neunter Planet entdeckt wurde und wie es direkt Zweifel an ihm gab. Und wie danach immer klarer wurde: Der ist gar kein Planet. Aber was ist er dann?
➡️ https://astrogeo.de/kein-herz-fuer-pluto-der-wohlverdiente-zwergplanet/ 🪐 👎
Wenn ihr trotz alledem ein Herz für Pluto habt: Bear with us. Wir mögen ihn ja auch, den Zwerg, und zwar so wie er ist! 💙
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Die Feiertagspause ist vorbei und Franzi erzählt, wie Pluto als neunter Planet entdeckt wurde und wie es direkt Zweifel an ihm gab. Und wie danach immer klarer wurde: Der ist gar kein Planet. Aber was ist er dann?
➡️ https://astrogeo.de/kein-herz-fuer-pluto-der-wohlverdiente-zwergplanet/ 🪐 👎
Wenn ihr trotz alledem ein Herz für Pluto habt: Bear with us. Wir mögen ihn ja auch, den Zwerg, und zwar so wie er ist! 💙
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Is there a hidden planet in our solar system? Astronomers say the moment of truth is near
— @CNN｢ Because objects in the Kuiper Belt are so far away from the sun, however, they are difficult to spot. For more than a decade, astronomers have been searching that area for a hidden planet that has never been observed, but its presence is inferred by the behavior of other nearby objects. It’s often called Planet X or Planet Nine ｣
https://edition.cnn.com/2024/11/04/science/planet-nine-kuiper-belt-latest-evidence/index.html
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Is there a hidden planet in our solar system? Astronomers say the moment of truth is near
— @CNN｢ Because objects in the Kuiper Belt are so far away from the sun, however, they are difficult to spot. For more than a decade, astronomers have been searching that area for a hidden planet that has never been observed, but its presence is inferred by the behavior of other nearby objects. It’s often called Planet X or Planet Nine ｣
https://edition.cnn.com/2024/11/04/science/planet-nine-kuiper-belt-latest-evidence/index.html
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I feel like 75% of #exoplanet astronomers get confused by planets in binary systems for some reason...
The simplest configuration is planets orbiting stars which also have a stellar companion. A large fraction of star systems are wide binaries so this is very common, and honestly not that interesting. Imagine if the Sun had an M-dwarf instead of #Planet9. Both stars could even host planets (unless the stellar companion is particularly close/large). Examples: Kepler-444, HD80606, Proxima Cen, etc -
I feel like 75% of #exoplanet astronomers get confused by planets in binary systems for some reason...
The simplest configuration is planets orbiting stars which also have a stellar companion. A large fraction of star systems are wide binaries so this is very common, and honestly not that interesting. Imagine if the Sun had an M-dwarf instead of #Planet9. Both stars could even host planets (unless the stellar companion is particularly close/large). Examples: Kepler-444, HD80606, Proxima Cen, etc -
https://phys.org/news/2024-04-evidence-planet.html
In 2015, a pair of astronomers at Caltech found several objects bunched together beyond Neptune's orbit…they theorized…due to the pull of gravity from an unknown planet—one that later came to be called #Planet9.
Since that time, researchers have found more evidence of the planet, all of it circumstantial…
The work involved tracking the movements of long-period objects that cross Neptune's orbit and exhibit irregular movements during their journey.
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[2404.11594] Generation of Low-Inclination, Neptune-Crossing TNOs by Planet Nine
https://arxiv.org/abs/2404.11594
#astrodon #planet9My friend, can your heart stand the shocking facts about grave robbers from outer space?
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[2404.11594] Generation of Low-Inclination, Neptune-Crossing TNOs by Planet Nine
https://arxiv.org/abs/2404.11594
#astrodon #planet9My friend, can your heart stand the shocking facts about grave robbers from outer space?
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Die hypothetische Lösung für kosmische Bewegungen ferner Himmelskörper: Hinter dem Pluto zieht #Planet9 seine Bahnen. Die bisher erfolglose Suche könnte jetzt dank einer neuen Studie an Fahrt gewinnen: https://winfuture.de/news,141473.html?utm_source=Mastodon&utm_medium=ManualStatus&utm_campaign=SocialMedia
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Scientists Are Now Close to Finding a Mysterious #Planet That Explains Strange Cosmic Phenomena
Researchers have excluded 78% of the search field for the hypothetical #Planet9; #astronomer #MichaelBrown says it may now be found within a few years. #PlanetNine hypothesis proposes that there’s an undiscovered planet lurking at the far reaches of our solar system, and that this could explain the strange orbits of around half a dozen objects at its outer edges. https://www.vice.com/en/article/ak38yk/scientists-are-close-to-finding-planet-9
