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Stephen Sekula

@steve.mastodon.cooleysekula.net.ap.brid.gy
111 followers 29 following 1.2K posts

Particle #Astrophysics researcher, #SNOLAB Research Group Manager, #Professor of #Physics at Queen's University. I live and work in #Sudbury, #Ontario […] 🌉 bridged from ⁂ mastodon.cooleysekula.net/@steve, follow @ap.brid.gy to interact

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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
More wild speculation fuel for the upcoming #NobelPrize in #Physics: steve.cooleysekula.net/blog/2026/09… Join me in the live blog on Tuesday morning for commentary on the ceremony and the award!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 11h
Learn more bout the work being done at @snolabscience.bsky.social and, at experiments across the globe, to map #neutrinos from deep within the Earth. The same nuclear reactions that have kept the Earth warm for a very long time also radiate neutrinos. They are the one known particle that can […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
More potatoes! 🥔 🥔 🥔 The second plant seemed amenable to replanting, so if I did a good job I should get more potatoes in 90 days or so. #gardening
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 03/10/2026
More wild speculation fuel for the upcoming #NobelPrize in #Physics: steve.cooleysekula.net/blog/2026/09… Join me in the live blog on Tuesday morning for commentary on the ceremony and the award!
steve.cooleysekula.net
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Reposted by Stephen Sekula
Mastodon Engineering @mastodonengineering.mastodon.social.ap.brid.gy · 01/10/2026
We just released Mastodon v4.7.3, v4.6.9, v4.5.19 and v4.4.26. They contain many bugfixes in addition to updating some of our dependencies to fix security issues in those. We recommend administrators to update when they can. Full release notes and update instructions are available on the […]
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Original post on mastodon.social
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/09/2026
The 2026 Nobel Prize in Physics [Live Blog] I am again live-blogging reactions to the announcement of the Nobel Prize. Join me early on the morning of October 6 (EST) for the announcement and some reactions! steve.cooleysekula.net/blog/2026/09…
steve.cooleysekula.net
The 2026 Nobel Prize in Physics [Live Blog]
I am again live-blogging reactions to the announcement of the Nobel Prize. Join me early on the morning of October 6 (EST) for the announcement and some reactions!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/09/2026
Fediversing the 2026 Physics Nobel Prize Last year, I turned the awesome power of the open federated social web, or fediverse, onto the question of the subject of the Nobel Prize in Physics. I did it with a poorly constructed poll, which predicted that the winning category would be in the […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 29/09/2026
Harvested the first potatoes today from the smallest plant that resulted from a potato-planting frenzy with my niece back in July. More potatoes to come!
Two potatoes harvested from a plant
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Reposted by Stephen Sekula
Mastodon Engineering @mastodonengineering.mastodon.social.ap.brid.gy · 23/09/2026
We are aware of an ongoing wave of subscription spam throughout the fediverse. We are investigating avenues to mitigate this, but they will likely involve deep changes in the sign-up flow that may break sign-up from existing applications. In the meantime, you can find helpful resources at […]
mastodon.social
Original post on mastodon.social
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 19/09/2026
I had a fantastic time this morning working at the #SNOLAB booth at the annual Anderson Farm fall fair in Lively. It was great to be able to meet lots of people, including community members who helped build the original SNO Experiment and SNOLAB, and share @snolabscience.bsky.social. Thanks […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 19/09/2026
Good morning, #Sudbury!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 18/09/2026
I had to shut off the "newsletter" feature on my #Mastodon instance because of a spam or bot attack that used fake email accounts to try to subscribe to accounts on the system. This led to a flood of bouncing emails outgoing from the mail server, which I do not like. Until #Mastodon is able to […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 17/09/2026
Oof. That was a harrowing #PeerTube version upgrade. But, IT IS DONE.
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Reposted by Stephen Sekula
FediForum @fediforum.mastodon.social.ap.brid.gy · 15/09/2026
Three weeks to FediForum, the online unconference to move the Open Social Web forward. More info and registration: fediforum.org
fediforum.org
FediForum
FediForum: moving the Open Social Web forward
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Reposted by Stephen Sekula
SNOLAB @snolabscience.bsky.social · 15/09/2026
www.thesudburystar.com/news/mission...
thesudburystar.com
Mission Unstoppable shines light on SNOLAB’s groundbreaking science
Deep beneath the surface of the Earth in Sudbury, SNOLAB scientist Erica Caden explains why solar neutrinos are playing hard to get.
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Reposted by Stephen Sekula
Mastodon Engineering @mastodonengineering.mastodon.social.ap.brid.gy · 15/09/2026
We just released Mastodon v4.7.2, v4.6.8, v4.5.18 and v4.4.25. In addition to several bugfixes, they disable HEIF processing to avoid a known critical security issues. We encourage server administrators to update as soon as possible. Full release notes and update instructions are available on […]
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Original post on mastodon.social
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 15/09/2026
RE: mastodon.cooleysekula.net/@steve/11… ONE HOUR LEFT! What broad topic area do YOU, THE #FEDIVERSE, believe will be the subject of the 2026 #NobelPrize in #Physics? Vote now, and I'l STOP. USING. ALL. CAPS. AND. STOPS.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 13/09/2026
It has been a really windy weekend. Has felt like something is making its way toward us. Well, here it comes, #Sudbury!
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 13/09/2026
Looking for some help, specifically people interacting with #PeerTube instances. I have noticed in the last 24 hours that I cannot subscribe to content on makertube.net. I am hoping this is just a problem with my instance, but if someone could try following an account there (like kevinmakes or […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Reposted by Stephen Sekula
Mineralogical Society of America @mineralsocamerica.bsky.social · 12/09/2026
Mineral Cup: Round 1 match 12: www.mineralcup.org/2026/vote-results/vote-r1m12
mineralcup.org
Vote in Round 1 Match 12 — Mineral Cup & Ore Cup
Vote in Pyrrhotite vs Cylindrite Credit:
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 13/09/2026
Got storms rolling in to #Sudbury.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 12/09/2026
RE: mastodon.cooleysekula.net/@steve/11… Well, the community has just 3 days left to participate in my extraordinarily unscientific poll to see what the #fediverse thinks might be the topic area of the 2026 #NobelPrize in #Physics. Last year, the community was […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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SNOLAB @snolabscience.bsky.social · 11/09/2026
Mission Unstoppable with Miranda Cosgrove spent a day SNOLAB senior research scientist Dr. Erica Caden underground to learn more about the lab and the elusive subatomic particles she has dedicated her professional life studying. #ParticlePhysics #STEM #GirlsInSTEM www.snolab.ca/news/mission...
snolab.ca
Mission Unstoppable Shines a Light on Groundbreaking Science of SNOLAB | SNOLAB
(SUDBURY) — One of North America’s most popular television and YouTube educational series paid a visit to SNOLAB recently to learn about solar neutrinos, and the people who research them.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 12/09/2026
Big Nickel! #Sudbury
The Big Nickel in Sudbury gleaming with sunlight approaching sunset.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 11/09/2026
From the American Institute of Physics FYI Bulletin: Astronomy, Materials Science Awards Plummet at NSF - AIP.ORG www.aip.org/fyi/astronomy-materials…
aip.org
Astronomy, Materials Science Awards Plummet at NSF
Physics grants saw a smaller drop in grants awarded this year compared to other fields within NSF’s Mathematical and Physical Sciences Directorate.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 11/09/2026
Dear Fediverse, The Super Cryogenic Dark Matter Search, or SuperCDMS, experiment is bridged into the #fediverse from Bluesky. They’ve suddenly become very active again today, and I promised when this happened I would advertise them to the […] [Original post on mastodon.cooleysekula.net]
The SuperCDMS experiment after completing construction and heading into operations in 2026.
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Reposted by Stephen Sekula
Super CDMS @supercdms.bsky.social · 10/09/2026
2026-08-07: The SuperCDMS experiment at SNOLAB began its first science data-taking run, following a six month commissioning period for the newly installed experiment. supercdms.slac.stanford.edu/news-and-out...
supercdms.slac.stanford.edu
News | Super Cryogenic Dark Matter Search
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 10/09/2026
@sparky Hopefully you will be pleased to know that your old Toshiba laptop continues to live on with Linux as the operating system. For $11 I just replaced the old DVD drive (which had a mechanical malfunction) with a hard drive bay. Now this little […] [Original post on mastodon.cooleysekula.net]
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 10/09/2026
If you haven't voted in round 9 of the #MinCup26, the matchup is between Hafnon and Putnisite. There are 45 minutes left to vote! www.mineralcup.org/2026/vote-result… I went with #Hafnon. It's a mineral involving hafnium. That […] [Original post on mastodon.cooleysekula.net]
Hafnon. Image from https://commons.wikimedia.org/wiki/File:Hafnon.jpg
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 09/09/2026
RE: mastodon.cooleysekula.net/@steve/11… Express your wild opinion about what subject area will be the subject of the 2026 #NobelPrize in #Physics! The wisdom of the crowd failed us last year. Let's go for two in a row. 😜
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 09/09/2026
Good morning, #Sudbury!
Sunrise on a Sudbury September morning
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 08/09/2026
Had a very smooth upgrade over the weekend from Linux Mint Debian Edition 6 to 7. This is on a Toshiba Satellite L645, which must be about 15 years old. It's my current go-to "typewriter" ... my no-frills writing computer.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 08/09/2026
Curious about when the 2026 #NobelPrize announcements are happening? Prize announcement dates - NobelPrize.org www.nobelprize.org/prizes/about/pri… Physics will be announced October 6.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 07/09/2026
Went for another lovely #hike today. This time, we did a 7km trail that has been a goal for a while. It did not disappoint! #nature w/ @jodi
Dense woods with sunlight streaming through the branchesAn interesting structure to a rockA fungus in partial shadeA beautiful reflective lake surface
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/09/2026
Had a nice hike through a local park today.
The sun and partly cloudy skies over a forested areaA close photo of pine needles and conesA view over a forest from a lookoutA lake is visible through leafy tree branches
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 05/09/2026
My effort to migrate my work email experience from Outlook to #Thunderbird is going quite well. I had to deal early on with Thunderbird and Outlook stepping on each other's toes in the Inbox, but I was reminded that "Repair" for a Thunderbird folder fixes this. I have experimented with plugins […]
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Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 02/09/2026
Here is the #SURF laboratory's press release on the #LZ anomalous event observation. The Sanford Laboratory hosts the experiment. LZ sees surprising result in the search for dark matter at SURF | Sanford Underground Research Facility […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 02/09/2026
Interested in the “unrolled” thread of my posts on the anomalous event observation by the #LZ #darkmatter experiment? Check out the whole thread here: mastoreader.io/?url=https%3A%2F%2Fm… (shout out to @cdarwin for making me aware […]
mastodon.cooleysekula.net
Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 02/09/2026
The #LZ #darkmatter experiment is operated by an international collaboration, but it’s hosted at the Sanford Underground Research Facility, 4850 ft underground in the Homestake Mine in Lead, South Dakota. I had the privilege of visiting #SURF in 2025, getting a tour, and giving a public lecture […]
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Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 02/09/2026
This was quite a fun day! The first thing in my inbox this morning was news of a strange particle interaction detected by an experiment called LUX-ZEPLIN, or #LZ. Containing 7 tonnes of liquid xenon, this observatory is designed to look for […] [Original post on mastodon.cooleysekula.net]
A photo of the central LUX-ZEPLIN time projection chamber, the vessel holding the central liquid xenon target. Here it is shown during either a construction or maintenance operation, but normally it’s hidden away inside a large shield to protect it from ambient, normal particle radiation.
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SNOLAB @snolabscience.bsky.social · 01/09/2026
Exciting news from SURF! A rare particle interaction that could be interpreted as a signal from a potential dark matter candidate in the LUX-ZEPLIN (LZ) experiment. This is a very tantalizing result that helps lead the way for future xenon experiments. newscenter.lbl.gov/2026/09/01/l...
newscenter.lbl.gov
LZ Sees Surprising Result in Search for Dark Matter
For the better part of a century, people have been trying to understand dark matter. This invisible substance makes up roughly 85% of the mass in the universe but has never been directly detected. Determining exactly what it is remains one of the biggest questions about our world.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 31/08/2026
Really enjoyed this @europlanet technical talk on hypersaline (read: super-salty!) environments and their use a potential models or analogs for alternative (read: non-Earth!) planetary habitats. How would they affect and be influenced by living organisms? Neat stuff […]
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Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 31/08/2026
I didn't get a chance to share this back in mid-August, but this was a great article on the Canadian effort to construct a new northern-hemisphere neutrino telescope off the coast of Vancouver Island in BC […] [Original post on mastodon.cooleysekula.net]
A screen capture of the news article showing photomultiplier devices partially submerged in seawater during a test.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 31/08/2026
Spent some time revisiting my web server configuration for my #PeerTube instance to tune the streaming parameters. Definitely worth it. I was noticing all kinds of bad buffering and stream timeouts after some initial tuning a few months ago. The retuning seems to have solved all of that. Should […]
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Original post on mastodon.cooleysekula.net
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 31/08/2026
RE: mastodon.social/@MineralCup/1171872… Learn about minerals while playing a game! Why waste your time watching people run back and forth tossing a sportsball around, when you can compete beautiful minerals that have been waiting thousands, millions, or billions of years to […]
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Original post on mastodon.cooleysekula.net
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Jonathan McDowell @planet4589.bsky.social · 30/08/2026
Roman's main camera is WFI, a 288-megapixel camera with a 1000 square arcminute field of view and HgCdTe photodiodes sensitive in the 0.4-2.3 micron band; the camera also enables low resolution spectroscopy with a grism and prism.
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Jonathan McDowell @planet4589.bsky.social · 30/08/2026
Roman's second instrument is the coronagraph, which will allow direct imaging of exoplanets at angular distances of 0.15 to 1.5 arcseconds from their host star; the glare of the host star's light will be blocked by the coronagraph.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/08/2026
A great relief to see the launch of #nancygraceromanspacetelescope into its first orbit avove the Earth. There are man\y maneuvers to come and months before it is at its destination, but this major milestone is passed!
Rocket lifts off launch padRocket heading through atmosphereRocket at higher altitude still in atmosphereSecond stage of rocket firing booster engine to achieve orbit.
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/08/2026
Rocket looking fine for #nancygraceromanspacetelescope
Video of rocket on launch pad
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Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 30/08/2026
Excited for the launch of the #nancygraceroman telescope!
Screen capture of countdown clock
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