Cometa McNaught y Antena 2 - From Ángel López-Sánchez - https://flic.kr/p/zbEFo

La imagen tomada hoy (22/11/25) por el satélite Terra de la NASA 🛰️🌍 muestra cómo las nevadas han llegado a la península ❄️🇪🇸. Este episodio frío nos deja una estampa totalmente invernal 🏔️🌨️🧊.

A very close view of the craters that cover the surface of Saturn’s icy moon Rhea. NASA’s Cassini mission made this flyby in January 2011, passing within 76 kilometers (47 miles) at a speed of 8 km/sec (18,000 mph). This image had a resolution up to 22.6 meters per pixel towards the closer terrain.

🔭 Dione and Rhea Ring Transit Image Credit & Copyright: Christopher Go apod.nasa.gov/apod/ap25112...

Here’s an annotated version of our comet image. We also want to thank our downlink and uplink teams who spent a huge amount of time working on this. Our camera was not designed to image interstellar objects 19 million miles away, but their hard work and planning paid off.

Wednesday, November 19, 2025

After a few days of rainy weather in #Granada, the clouds lifted to reveal... A glorious snow dump on the #SierraNevada!

I had three meetings schedules for the rest of the week, and two have just been moved! Happy days. However, the big grant writing deadline just got moved forward. Boo :( #OverlyHonestMethods

Spectacular view from Cassini *inside* Saturn's rings 🪐

*looks up a comet fit in JPL small bodies database* Fit producer: Otto Matic... right... this an in joke at JPL right?😅

#PlanetaryResearch is not just a 💎 #OpenAccess journal (submissions soon)! It's supported by the Planetary Research Cooperative, a free-to-join association that is also running a blog. Register to publish posts, sign up for the weekly digest, or just visit to read posts here #PlanetaryScience

Wow, stunning picture of ☄️ #comet Lemmon! 🤩 And taken just down the road from #Granada too!

3I/ATLAS is the first interstellar object bright enough for amateurs to image: so fabulous to see the delight ☄️😍

Observations from #Mars helping to constrain the orbit of ☄️ #3IATLAS, including the first (surprising to me) entry into the Minor Planet Centre database from another planet! Hopefully this kind of thing can also be done for an incoming @cometinterceptor.bsky.social target... #PlanetSci

Once again I am scaring myself with how fast I can now crack out some plausible sounding proposal text #OverlyHonestMethods

#OTD: 12 November 2014, @esa.int's Rosetta Philae lander made history by touching down on the surface of a comet, the first spacecraft ever to do so. The landing was confirmed at 16:03 GMT/17:03 CET 🧪🔭 www.esa.int/Science_Expl... @cnes.fr @dlr-de.bsky.social @operations.esa.int @science.esa.int

reader, it did not calm down... Today I had a meeting of my thermal modelling group, during which I received emails from two other projects requesting meetings, and my boss came in to have a big discussion on our grant renewal plans!

Omg this! People keep trying to help me learn french and Spanish by saying things like that's the complement, object, direct or 1st person possessive pronoun or some such. And I'm like, buddy, first you're gonna have to spend half an hour explaining what those concepts mean in English

Want to know why your mobile phone photos of the Moon look like crap? I have a new @aunz.theconversation.com article explaining why, how you can take better(ish) photos, and what astronomical sights your phone can photograph well. theconversation.com/why-is-it-so...

#Saturn and a #SmallBody together in one image! Excellent 🪐🥔

Excellent, I'll have to tell my intern! He's been doing great work on #comet ☄️ orbits perturbed by non-gravitational forces from their outgassing. We have already presented results to the @cometinterceptor.bsky.social team, and hopefully we will write a #PlanetaryScience paper on the subject!

Right after sunset, Milky Way, Comet Lemmon, countless artificial satellites, and Japan all together. 📸 Kimiya Yui x.com/Astro_Kimiya...

So 3 weeks ago I 'travelled' to #Rio one Thursday night to give a seminar on #comets ☄️. Tonight I 'travelled' to #Orlando for a PhD committee meeting of a University of Central Florida student studying #Saturn's rings 🪐 (takes me back to my own PhD on #Cassini 🛰️🙂)!

🚀🇪🇸🇪🇺

✔️ El 50 aniversario del Instituto de Astrofísica de Andalucía, protagonista de un décimo de la Lotería Nacional El sorteo del 13 de noviembre conmemora medio siglo de investigación, tecnología y divulgación científica del IAA-CSIC 🌐 www.iaa.csic.es/noticia/el-5...

Just gave our @iaacsic.bsky.social journal club summarising the @europlanetmedia.bsky.social #EPSCDPS2025 meeting in Helsinki (now nearly 2 months ago!) . Now looking forward to welcoming a couple of guests from the @oeaw.bsky.social Space Research Institute, Graz for some collaborative discussions!

Just a ridiculously big moon hanging in the sky on the way back to Granada

☄️ Comet #3I/ATLAS is currently making its closest approach to the Sun. #ESAJuice might catch the best view of this comet in a very active state. Juice will attempt observations in November 2025, with data received on Earth in February 2026 👉 www.esa.int/Science_Expl... 🔭🧪

Phewph, now that's out of the way (after EPSC, project supervision, JWST deadline, grant applications, and visitors) things will calm down, right? *sees more visitors arriving, CoCa team meeting, and then Christmas coming up fast..* ...right?

This is super cool. Cubesats heading off into deep space by themselves! Soon for #PlanetaryScience missions??

Now this is how to attend a meeting! Listening in to the @cometinterceptor.bsky.social ☄️SWT whilst waiting to pick up my son from sports. Luckily the sports centre is down by the river, with this view 😀🏞️ #Granada

I'd never heard of a meteor train before! Interesting. I guess it zigzags because the atmosphere is now moving the dust and debris around? Can you track high altitude wind shear with meteor trains?!

Advert for Uber on every YouTube video and I've just realised the one where the bridal party breaks down uses 'Under Pressure' when 'Modern love' was right there!... 'gets me to the church on time'...!

Helpful safety guide...

Dione and Rhea - From Gordan Ugarković (ugordan.bsky.social) - https://flic.kr/p/9ZbYVx

#ROSETTA INTERNATIONAL MISSION COMET #67P/CHURYUMOV-GERASIMENKO Date 23 jan 2015 Distance 27.9 km OSINAC Orange green blue ortho fe203 rosetta-osiris.eu/image/NAC_20... ESA/Rosetta/OSIRIS/j. Roger

​🗞️​ El Instituto de Astrofísica de Andalucía culmina su 50 aniversario con un gran acto conmemorativo 🌐 www.iaa.csic.es/noticia/el-i... IAA-CSIC/Toni Juárez

Hoy celebramos nuestros 50 años por todo lo alto, con un evento que une arte y ciencia ✨ @csic.es

And now the big event: celebrating 50 years of @iaacsic.bsky.social at Caja #Granada Cultural Centre

Astronomers have discovered rings forming around a Centaur. For real: Chiron (a comet-asteroid hybrid orbiting beyond Saturn) has set of rings that seem to be changing by the year. Regardless of what's happening on Earth, space continues to be amazing. 🧪🔭 iopscience.iop.org/article/10.3...

An excellent space potato 🥔

Now that I've sorted all my SPICE issues, I can play around dropping comets on different orbits and see what happens! #comet 67P, you are now hyperbolic ☄️😀

Saw the Perspectiva exhibition of #astronomy and #space images for @iaacsic.bsky.social 's 50th anniversary on the way into #Granada today. Very nice

A thread which makes me feel slightly better about the field of #astronomy 😊 Not sure about the nature papers things, but tbh I do generally get the impression our field is *usually* a lot nicer and more collaborative than other branches of science

Giving a seminar on my work on modelling #comet ☄️ activity tonight to the #Astronomy department of the national observatory 🔭 of Rio de Janeiro! Online of course, sadly they did not fly me out to Rio 😛🇧🇷

Today is the deadline for proposing for observations with JWST. Across the globe, scientists are furiously putting the finishing touches on ideas spanning the nearest planets and stars to the most distant galaxies. Only ~10% of proposals will be accepted, and the science will be amazing. 🧪☄️

The JWST Cycle 5 "Procrastination Monitor", i.e. Molly's proposal counter submission form, is up an running. Please fill it out if you have data to add to it. And do share! #JWSTCycle5 docs.google.com/forms/d/e/1F...

Procrastination takes may forms. Tonight as a service to the astronomical community I offer help with your JWST proposal titles. #JWST 🧪🔭✨

SLIMbles wobble, but they don’t fall down! In January 2024, the JAXA SLIM mission achieved Japan’s first soft lunar landing with pinpoint precision, but face down! The team celebrated by creating these awesome models from Mino washi paper that always roll into their head (like Playskool Weebles) 😂

successfully created my own reference frame definition in #SPICE! Huzzah! #methods (SPICE is the NASA ephermerides system for computing the positions and orientations of solar system bodies. I basically can now make up local body coordinates of an arbitrary body, but it's a start 🙂)