Mexico’s overwintering monarch population grew 64% this winter, with butterflies covering their largest area of forest since 2018. The recovery remains fragile, but suggests there’s been a positive impact from conservation efforts in the butterflies’ core habitat. buff.ly/XoPKQ9d
#ShareGoodNewsToo
Rubin Observatory's shiny silver dome beneath a starry night sky. The dense glowing band of the Milky Way emanates from Rubin on the left toward the upper right.
Mapping the Milky Way is like mapping a forest from inside it 🌌
From our spot ~27,000 light-years from the center, the big picture is hard to see. NSF–DOE Rubin Observatory will detect and measure ~17B stars, creating a Milky Way map ~100× larger than we've had before. 🔭🧪
Women In Astronomy: Career Interview Series
Vicky Derksen’s journey into #astronomy didn’t start with a childhood telescope or a university degree. Growing up in northern Idaho, she saw the Milky Way all the time & simply assumed everyone else did too. womeninastronomy.blogspot.com/2026/02/care...
Ciudad amurallada
Christmas market, 25°C
Christmas festivities in the tropics
Campeche, México. Colorful town where the winter never comes.
Warsaw at night
🐜 Un par de 𝗵𝗼𝗿𝗺𝗶𝗴𝗮𝘀 fósiles de la Formación Green River de EUA, con una antigüedad aproximada de 𝟰𝟴.𝟲𝟲 millones de años (Eoceno).
📷 J. E. Bruce.
The etymology of pets | Words Unravelled from @jesszafarris.bsky.social & @robwords.bsky.social
www.youtube.com/watch?v=_r2H...
My department is hiring a theoretical physicist. I’m not on the search committee but happy to answer questions about the department. Come join our great group of people here. 🧪🔭
inspirehep.net/jobs/3064718
Polish Golden Autumn
💛🧡🍂🍁
Photo plate of Hubble's famous "VAR!" discovery. This is a photonegative plate of an image of the Andromeda Galaxy, with several small annotations made in grease pencil. One of them was previously marked "N" for "nova," but the N has been crossed out and replaced with an excited "VAR!" to indicate a Cepheid Variable.
VAR!
In the early morning hours #OTD in 1923, Edwin Hubble took a photo plate of M31 that showed a Cepheid variable star.
Using Henrietta Swan Leavitt’s distance-luminosity relationship, Hubble concluded that M31 is another galaxy outside the Milky Way. 🧪 🔭 ⚛️
Image: Carnegie Observatories
The Antikythera Mechanism!!
An ancient astronomical calendar and the world’s oldest known analogue computer.
National Archaeological Museum, Athens, Greece.
Moments in Malta
Gozo, Malta
National archaeological museum
Athens, Greece.
The sophisticated COLIBRE simulations finally land on the arXiv: arxiv.org/abs/2508.21126. Treating these with sonification, we can get new intuition for galaxy evolution to augment our visuals. Sound on for the explainer vid, visit the site for more! colibre.strw.leidenuniv.nl/videos.html 🔭🧪
Warsaw at night
Cc
@musicalneutron.bsky.social
Hello world! Greetings from the first snowy day of the winter in Warsaw.
