Sean McMahon
@seanhmcmahon.bsky.social
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https://www.astrobiology.ac.uk/mcmahon-group
pinned post!
🚨New preprint (not peer reviewed)! Last year, NASA announced "potential biosignatures" on Mars: bleached spots in rust-red rocks. Here, we show that rust-dissolving bacteria really can make spots like these. Next step: see if we can make them without bacteria!
#astrobiology
doi.org/10.64898/202...
4 months ago
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Philip Donoghue
about 3 hours ago
Our latest: Theoretical morphospace reveals mixed optimisation of the avian wing planform for flight style - the work of Benton Walters, with very little help from myself and
@emilyrayfield.bsky.social
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Theoretical morphospace reveals mixed optimisation of the avian wing planform for flight style - Nature Communications
Here, the authors examine bird wing planform shape and functional performance using theoretical morphospace and phylomorphospace. They find that, in a sample of 1138 extant bird taxa, planform shape i...
https://www.nature.com/articles/s41467-026-70692-w
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Emily Lakdawalla 🏳️⚧️ Uranus Expert
2 days ago
Ok this one is my favorite
add a skeleton here at some point
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Sean Jones KC
7 days ago
So, if the ball, delivered by the bowler, not being a Wide, passes the striker without touching his/her bat or person, any runs completed by the batters from that delivery, or a boundary allowance, shall be credited as Byes to the batting side.
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Steve Brusatte
9 days ago
The first review of The Story of Birds is out, in today's
@theguardian.com
! 'Charismatic…The Story of Birds swoops through the incredible journey of avian-kind, revealing how small cousins of Velociraptors gave rise to the panoply of birdlife around us today.'
www.theguardian.com/science/2026...
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Scientists believe birds’ skulls hold clues to inner lives of long-extinct dinosaurs
Early birds were like ‘T rex reincarnated’, says scientist who believes avian skulls offer insight into dinosaurs’ behaviour
https://www.theguardian.com/science/2026/apr/26/scientists-believe-birds-skulls-hold-clues-to-inner-lives-of-long-extinct-dinosaurs
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Hourly Cosmos
11 days ago
Curiosity _ some pictures of Navcam R _ sky and clouds on Mars - From 2di7 & titanio44 -
https://flic.kr/p/2g4ZVnM
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Hourly Cosmos
13 days ago
viking (3) - From Jacint Roger (
landru79.bsky.social
) -
https://flic.kr/p/2iKVSej
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Del - Martian Observer
13 days ago
NASA Mars Perseverance Rover Sol 1,835 (19th April, 2026) The view west-south-west of the rover MastCam-Z (L) @ ~10:22 lmst S/D: 087/4184 CC BY-NC-SA 4.0 Credits: NASA / JPL-Caltech / ASU / MSSS / Martian-Observer
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Hourly Cosmos
12 days ago
Phobos Over Mars - Tharsis, Valles Marineris and a Dust Storm - ESA Mars Express 300MP - From Andrea Luck (
andrealuck.bsky.social
) -
https://flic.kr/p/2rMW4so
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Hourly Cosmos
13 days ago
Perseverance_sol2_NCR_5 - From Thomas Appéré (
thomasappere.bsky.social
) -
https://flic.kr/p/2kE4wVA
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Andrew D Thaler
15 days ago
A wild thread: 490 million years ago, the seafloor which would become the city of Baltimore was a serpentinite-hosted hydrothermal vent complex. Those vents laid the ultramafic structures that would, in 1812, be discovered as America's first chromite mine.
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Did Mars once have a vast ocean? This new paper reports a topographic signature of a planet-girdling coastal shelf. This is a new and clearer signal than we saw previously from the deltas and possible shoreline deposits. Very exciting.
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Identifying the topographic signature of early Martian oceans - Nature
Shelves rather than shorelines may be better topographic indicators of oceans on Earth and Mars.
https://www.nature.com/articles/s41586-026-10381-2
15 days ago
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Not generally a Labour supporter but I don’t think Starmer should resign. He is a good and honest public servant and the best prime minister we have had in a long time.
19 days ago
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Sean McMahon
Prof. Nicole Holliday
25 days ago
Humanity did that. Science did that. Publicly-funded research did that. Excellent universities did that. Diversity did that. International cooperation did that. Artemis II is a perfect example of what we can do at our best. Welcome home, Integrity crew!
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Sarah Hörst
25 days ago
Feels relevant
#Artemis
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Dr. Amy Hagen
about 2 months ago
It’s been a big week! Another new paper out in Palaios describing some awesome silicified cyanobacteria fossils and their taphonomic history.
#fossils
#cyanobacteria
#cambrian
doi.org/10.2110/palo...
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TAPHONOMY AND PALEOENVIRONMENTAL SIGNIFICANCE OF SILICIFIED CYANOBACTERIAL FOSSILS IN THE EARLY CAMBRIAN HARKLESS FORMATION, NEVADA, USA | PALAIOS | GeoScienceWorld
Abstract. Primary producers play a critical role in marine ecosystems and global biogeochemical cycling, but the limited preservation of soft-bodied
https://doi.org/10.2110/palo.2025.035
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Kate Marvel
26 days ago
the thing about a publicly funded space program is that you get to be represented by these people as opposed to, say, Jeff Bezos's second wife
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Kevin M. Gill
26 days ago
This might be one of my favorites from Artemis II. A cinematic alignment of the Moon and Earth, each cradled within the warmth of sunbeams. Taken from behind the Moon on April 6th.
flic.kr/p/2s6BABn
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Jonathan McDowell
28 days ago
Anyone else getting strong Croesus-at-the-Oracle-of-Delphi vibes from this statement?
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Katie Mack
29 days ago
This is the face of a lunar scientist who has just been told that the
#Artemis
II crew saw SEVERAL impact flashes (the flashes when meteors hit the lunar surface) in real time 😃 🌓💥
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This shit again.
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about 1 month ago
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Away we go! — and what care we For treasons, tumults, and for wars? We are as calm in our delight As is the crescent-Moon so bright Among the scattered stars (William Wordsworth, "Peter Bell", 1798)
about 1 month ago
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Sean McMahon
Ed Davey
about 1 month ago
Then vs now. Such a shame.
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Erin E. Saupe
about 1 month ago
‼️🚨 Job Alert ‼️ 🚨 Two Post Doc Opportunities: PDRA in Macroecology / Paleobiology
my.corehr.com/pls/uoxrecru...
PDRA in Extinction & Conservation / Paleobiology
my.corehr.com/pls/uoxrecru...
Any questions, please get in touch! Closing date May 1st.
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Job Details
https://my.corehr.com/pls/uoxrecruit/erq_jobspec_version_4.display_form?p_company=10&p_internal_external=E&p_display_in_irish=N&p_process_type=&p_applicant_no=&p_form_profile_detail=&p_display_apply_ind=Y&p_refresh_search=Y&p_recruitment_id=185737
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I enjoyed this unusually literary bit of marketing from my university with
@mckeever.bsky.social
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Edinburgh good reads: a modern Scottish literature bookshelf - Edinburgh Impact
Discover Dr Gerard McKeever’s favourite Scottish classics, inspiring quotations, and what he’s reading now for pure enjoyment.
https://impact.ed.ac.uk/inspiring-minds/edinburgh-good-reads-a-modern-scottish-literature-bookshelf/?utm_source=facebook&utm_medium=organic_post&utm_campaign=cam_edinburgh_impact&utm_term=&utm_content=edinburgh_good_reads_gerard_mckeever&fbclid=IwY2xjawQzpOdleHRuA2FlbQIxMQBzcnRjBmFwcF9pZBAyMjIwMzkxNzg4MjAwODkyAAEef3Gy4baqzS9Dcg6uxHoXJmgZ472ZElPN-MkfdmQd6pwIrlld0lfLEqWD4xU_aem_ZvnEnxZwMoBkLaTCnpOynQ
about 1 month ago
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Kevin Olsen
about 1 month ago
Ever wonder where the science landed on bio-signatures on exoplanets? Our
@oxfordphysics.bsky.social
colleague
@astrojake.bsky.social
has written up a succinct summary of the drama and what the latest paper adds. It's a good read!
astrojake.substack.com/p/the-k2-18b...
🔭🧪
#planetsci
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The K2-18b saga continues...
K2-18b has become a very popular exoplanet, both within the scientific community and beyond.
https://astrojake.substack.com/p/the-k2-18b-saga-continues
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Sean McMahon
Corey S. Powell
about 1 month ago
A new 225-meter (740-foot) crater appeared on the Moon while nobody was looking. NASA's lunar orbiter imaged the dramatic aftermath. Such large impacts are once-in-a-century events. This one happened in the spring of 2024. 🔭🧪
www.sciencenews.org/article/moon...
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laura olin
about 1 month ago
Is it a giant wooden horse
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This is... not going to happen
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about 1 month ago
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Desert varnish on Mars?
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about 2 months ago
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Sean McMahon
Mark Lemley
about 2 months ago
The US is no longer a liberal democracy, according to the top global watchdog on freedom and democracy. We're falling fast, and are now classed the same as Guatemala, Colombia, and Peru
www.v-dem.net/documents/75...
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https://www.v-dem.net/documents/75/V-Dem_Institute_Democracy_Report_2026_lowres.pdf
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Hadas Weiss
about 2 months ago
it just occurred to me that let there be light was the first prompt
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The Mars Sample Return program - cancelled by the US because of cost overruns - was cheaper than this. Humanity could have brought home the most promising potential signs of life ever found beyond Earth. I guess one way or another we are learning who we are.
add a skeleton here at some point
about 2 months ago
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Sean McMahon
Moudhy Al-Rashid (she/her)
about 2 months ago
There's a broken cuneiform tablet from the Old Babylonian period, nearly 4,000 years ago, which preserves a tiny portion of a dialogue between two friends. It feels a bit like the conversations I've been having for the past week, so I wanted to share it.
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🚨Lectureship vacancy in Planetary Science at UCL/Mullard!
add a skeleton here at some point
about 2 months ago
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Sean McMahon
Dr. Adeene Denton
2 months ago
No asteroid impact into the Moon?
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Sean McMahon
Appendix N Entertainment
2 months ago
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”…meaning does not just sit in a literary text like a prize at the bottom of a cereal box”. AI makes the humanities more necessary than ever.
www.publicbooks.org/aib/
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AI=B+ - Public Books
“The essays ChatGPT produced in mere seconds are quite plausible as the last-minute work of a rushed undergraduate.”
https://www.publicbooks.org/aib/
2 months ago
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Sean McMahon
Duncan McIlroy
2 months ago
phys.org/news/2026-02...
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Exceptionally preserved 551-million-year-old site suggests Avalon biota lasted longer
Researchers studying the soft-bodied Ediacaran biotas of the world generally accept that there are three distinct assemblages. The 575–560-million-year-old (Ma) Avalon Assemblage is best known from th...
https://phys.org/news/2026-02-exceptionally-million-year-site-avalon.html
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Igor Adameyko
2 months ago
Glob-glob! Absolutely magical sea anemone larva (about 7 mm) from The Lombok Strait, Indonesia 🇮🇩
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well it’s dan
2 months ago
Sup chat this is Slouching Towards Bethlehem with your boy The Rough Beast, and it looks like today’s stream could be a big one, as some of you might’ve already seen there are rumors going around social media that the hour has come round at last, so we’re gonna get right into it
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The Palaeontological Association
2 months ago
The Palaeontological Association has written to the President of the University of Leicester, requesting that the concerns of the PhD community over the planned redundancy of their supervisors are addressed. [1/3]
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Excellent explainer
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2 months ago
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Sharon O'Dea
2 months ago
Quite rare to see a chart that says quite so overtly that no one involved has the slightest clue what’s happening here
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So proud of my
@theukca.bsky.social
PhD student
@astr0mia.bsky.social
for her public engagement award! Check out our Tartan Tardigrade podcast that Mia hosts:
podcasts.apple.com/gb/podcast/t...
add a skeleton here at some point
2 months ago
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Sean McMahon
Russell Garwood
2 months ago
Today for
#FossilFriday
a lovely example of science in action:
www.sciencedirect.com/science/arti...
A bunch of us described structures in 2017 that we interpreted as very small burrows. This great new paper describes new material, and throws an impressive range of analytical / ⚒️🧪🦀🦑
#evosky
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Proposed Ediacaran meiofaunal burrows from Brazil are pyritized algal/microbial consortia
The Ediacaran Period marks the first appearance of animal body fossils in the rock record. While the metazoan affinities of many late Ediacaran macrof…
https://www.sciencedirect.com/science/article/pii/S1342937X26000420
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Dr. Laci Brock 🪐
3 months ago
Perseverance celebrates 5 years on Mars! This is a painting of the day Ingenuity unfolded (rip 🥲🚁)
#space
#astronomy
🔭🧪🐡
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Dave Levitan
3 months ago
Getting shown up in the arena of elite impunity by *the British monarchy* is an incredible “America at 250!” achievement
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Katharine Hayhoe
3 months ago
Bluesky is the new science Twitter, new study by
@whysharksmatter.bsky.social
and Julia Wester concludes! "Results show that for every reported professional benefit that scientists once gained from Twitter, scientists can now gain that benefit more effectively on Bluesky than on Twitter."
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Scientists no Longer Find Twitter Professionally Useful, and have Switched to Bluesky
Synopsis. Social media has become widely used by the scientific community for a variety of professional uses, including networking and public outreach. For
https://academic.oup.com/icb/article-abstract/65/3/538/8196180?login=false
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A new article in the journal Astrobiology argues that high concentrations of organics in a rock on Mars cannot presently be explained non-biologically. It's an interesting and valuable paper, but I think a bit one-sided because...
science.nasa.gov/blogs/scienc...
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NASA Study: Non-biologic Processes Don’t Fully Explain Mars Organics - NASA Science
In a new study, researchers say that non-biological sources they considered could not fully account for the abundance of organic compounds in a sample
https://science.nasa.gov/blogs/science-news/2026/02/06/nasa-study-non-biologic-processes-dont-fully-explain-mars-organics/
3 months ago
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Sean McMahon
Avery Edison
3 months ago
sigh
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