Mark Marley
@markmarley.bsky.social
Personal account. Substellar science since the 80s.
Reposted by Mark Marley
Flagstaff’s Lowell Observatory plans to cut nearly all its research funding and reduce the number of paid science staff to just two positions next year.
Lowell Observatory slashes research funding in the midst of financial struggle
Flagstaff’s Lowell Observatory plans to cut nearly all its research funding and reduce the number of paid science staff to just two positions next year.
buff.ly
November 10, 2025 at 7:00 PM
Flagstaff’s Lowell Observatory plans to cut nearly all its research funding and reduce the number of paid science staff to just two positions next year.
Reposted by Mark Marley
Why are planetary scientists, astrobiologists and and SETI scientists so negative (pissed off, even) about Avi Loeb’s repeated claims that 3I/Atlas may be an invading alien spaceship?
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November 10, 2025 at 11:41 PM
Why are planetary scientists, astrobiologists and and SETI scientists so negative (pissed off, even) about Avi Loeb’s repeated claims that 3I/Atlas may be an invading alien spaceship?
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This weekend I read that the entire Breaking Bad franchise is estimated to have had $385M in economic impact for the state of NM and this is celebrated by a statue at the ABQ convention center. Meanwhile University of Arizona space science has an economic impact of $560M on our state every year.
November 10, 2025 at 11:45 PM
This weekend I read that the entire Breaking Bad franchise is estimated to have had $385M in economic impact for the state of NM and this is celebrated by a statue at the ABQ convention center. Meanwhile University of Arizona space science has an economic impact of $560M on our state every year.
Reposted by Mark Marley
I've summarized the truth about Loeb's 10 "anomalies" about 3I/ATLAS in one post.
Thanks to @deschscoveries.bsky.social @michael-w-busch.bsky.social @cometary.org and @marshall-eubanks.bsky.social for contributing their expertise!
Thanks to @deschscoveries.bsky.social @michael-w-busch.bsky.social @cometary.org and @marshall-eubanks.bsky.social for contributing their expertise!
Loeb’s 3I/ATLAS “Anomalies” Explained
Avi Loeb continues to claim that 3I/ATLAS has many anomalous behaviors that lead to the conclusion that it “might” be an alien spacecraft. He carefully hedges the probability that it is a spacecraft ...
sites.psu.edu
November 10, 2025 at 12:22 AM
I've summarized the truth about Loeb's 10 "anomalies" about 3I/ATLAS in one post.
Thanks to @deschscoveries.bsky.social @michael-w-busch.bsky.social @cometary.org and @marshall-eubanks.bsky.social for contributing their expertise!
Thanks to @deschscoveries.bsky.social @michael-w-busch.bsky.social @cometary.org and @marshall-eubanks.bsky.social for contributing their expertise!
Reposted by Mark Marley
Picked up my 30th Potentially Hazardous Asteroid last shift. This one is interesting. In a retrograde comet-like orbit with a period around 26yrs but showing no activity at ~1 AU from the sun. Likely 1km + in size with Earth MOID = 0.0275 AU. Now published as 2025 VP.
November 9, 2025 at 12:24 AM
Picked up my 30th Potentially Hazardous Asteroid last shift. This one is interesting. In a retrograde comet-like orbit with a period around 26yrs but showing no activity at ~1 AU from the sun. Likely 1km + in size with Earth MOID = 0.0275 AU. Now published as 2025 VP.
Reposted by Mark Marley
Sharon was, to my great benefit, my boss, teacher, and mentor. And goddamn could she write. This lede!
A Sharon Begley byline, almost 5 years after her death.
Upon hearing the news James Watson had died, a STAT reporter said in our Slack, "I wish I could read what Sharon would have written."
Incredible news: Sharon in fact did pre-write a Watson obit. And it is masterful and excoriating.
🧪🧬🧫
Upon hearing the news James Watson had died, a STAT reporter said in our Slack, "I wish I could read what Sharon would have written."
Incredible news: Sharon in fact did pre-write a Watson obit. And it is masterful and excoriating.
🧪🧬🧫
James Watson, dead at 97, was a scientific legend and a pariah among his peers
James Watson, the co-discoverer of the structure of DNA who died Thursday at 97, was a scientific legend and a pariah among his peers.
www.statnews.com
November 8, 2025 at 11:33 PM
Sharon was, to my great benefit, my boss, teacher, and mentor. And goddamn could she write. This lede!
I don’t begrudge the hawk its dinner but wish it had eaten on the outside of the patio wall instead of inside.
November 8, 2025 at 11:14 PM
I don’t begrudge the hawk its dinner but wish it had eaten on the outside of the patio wall instead of inside.
Reposted by Mark Marley
We (The School of Earth and Space Exploration at ASU) are looking for a new director! Come be my new boss!
apply.interfolio.com/176991
apply.interfolio.com/176991
Apply - Interfolio
{{$ctrl.$state.data.pageTitle}} - Apply - Interfolio
apply.interfolio.com
November 8, 2025 at 10:18 PM
We (The School of Earth and Space Exploration at ASU) are looking for a new director! Come be my new boss!
apply.interfolio.com/176991
apply.interfolio.com/176991
Goddard is a critical component of the US capability to study Earth, the sun, the solar system, and our universe. Discarding pieces of this capability without a great deal of forethought is a major mistake.
🚨 NASA scientists warn: critical equipment at Goddard Space Flight Center could be discarded during the shutdown, jeopardizing decades of Earth & space science missions.
📢 Act now: agu.quorum.us/campaign/146...
#sciencepolicy #saveNASA
📢 Act now: agu.quorum.us/campaign/146...
#sciencepolicy #saveNASA
November 7, 2025 at 2:35 PM
Goddard is a critical component of the US capability to study Earth, the sun, the solar system, and our universe. Discarding pieces of this capability without a great deal of forethought is a major mistake.
Q&A with @catalinaskysurvey.bsky.social's Director Carson Fuls about discovering Comet Lemmon. news.arizona.edu/employee-new...
Q&A: Look up! What it takes to discover a comet
Comet "Lemmon" was discovered by the University of Arizona's Catalina Sky Survey. CSS Director Carson Fuls sat in the observing room on a cold winter night when the comet first announced itself as a f...
news.arizona.edu
November 6, 2025 at 3:01 PM
Q&A with @catalinaskysurvey.bsky.social's Director Carson Fuls about discovering Comet Lemmon. news.arizona.edu/employee-new...
Today Show Tucson feature this morning ideally should have had featured the other side of Cherry in this aerial shot.
November 6, 2025 at 1:51 AM
Today Show Tucson feature this morning ideally should have had featured the other side of Cherry in this aerial shot.
Reposted by Mark Marley
Enjoyed giving a UofA Origins talk on how protoplanetary disks evolve – featuring new results from ALMA and JWST. The recording is available here 👇
youtu.be/mdgGgnjVbb0
@uarizonalpl.bsky.social @stewardobservatory.bsky.social
youtu.be/mdgGgnjVbb0
@uarizonalpl.bsky.social @stewardobservatory.bsky.social
Protoplanetary Disk Evolution in the ALMA–JWST Era (Ilaria Pascucci, UArizona/LPL)
YouTube video by Origins Seminars
youtu.be
November 5, 2025 at 4:10 PM
Enjoyed giving a UofA Origins talk on how protoplanetary disks evolve – featuring new results from ALMA and JWST. The recording is available here 👇
youtu.be/mdgGgnjVbb0
@uarizonalpl.bsky.social @stewardobservatory.bsky.social
youtu.be/mdgGgnjVbb0
@uarizonalpl.bsky.social @stewardobservatory.bsky.social
Reposted by Mark Marley
November 3, 2025 at 1:14 PM
Reposted by Mark Marley
Column: You can hardly turn a corner in Tucson's core without seeing a lively mural scene of desert life, many of the pieces by Joe Pagac. Some muralists say it's getting to be too much of the same. Even Pagac had to ponder when asked if there's too much Pagac.
tucson.com/news/local/s...
tucson.com/news/local/s...
Tim Steller's column: Tucson muralists seek opportunities beyond Pagac's desert style
For Star subscribers: Artist Joe Pagac helped set off a mural explosion in Tucson. But with his success has come pigeonholing — not just for him but for other Tucson
tucson.com
November 2, 2025 at 3:50 PM
Column: You can hardly turn a corner in Tucson's core without seeing a lively mural scene of desert life, many of the pieces by Joe Pagac. Some muralists say it's getting to be too much of the same. Even Pagac had to ponder when asked if there's too much Pagac.
tucson.com/news/local/s...
tucson.com/news/local/s...
Some new members of the family.
November 2, 2025 at 3:41 PM
Some new members of the family.
Lots of trick or treaters tonight and great costumes.
November 1, 2025 at 1:29 AM
Lots of trick or treaters tonight and great costumes.
Reposted by Mark Marley
So the updated 3I/ATLAS orbit now included positions up to a couple days ago…
ssd.jpl.nasa.gov/tools/sbdb_l...
The orbit now has a *marginally* (3.16sigma) detectable A1 radial non-gravitational acceleration of (1.66+-0.53)e-6 au/day^2.
Given the periheilion (1.3au), if you compare it to….
ssd.jpl.nasa.gov/tools/sbdb_l...
The orbit now has a *marginally* (3.16sigma) detectable A1 radial non-gravitational acceleration of (1.66+-0.53)e-6 au/day^2.
Given the periheilion (1.3au), if you compare it to….
Small-Body Database Lookup
This website makes extensive use of JavaScript. The top menus will not function without it and most tools will also not work.
ssd.jpl.nasa.gov
October 31, 2025 at 8:14 PM
So the updated 3I/ATLAS orbit now included positions up to a couple days ago…
ssd.jpl.nasa.gov/tools/sbdb_l...
The orbit now has a *marginally* (3.16sigma) detectable A1 radial non-gravitational acceleration of (1.66+-0.53)e-6 au/day^2.
Given the periheilion (1.3au), if you compare it to….
ssd.jpl.nasa.gov/tools/sbdb_l...
The orbit now has a *marginally* (3.16sigma) detectable A1 radial non-gravitational acceleration of (1.66+-0.53)e-6 au/day^2.
Given the periheilion (1.3au), if you compare it to….
Reposted by Mark Marley
It’s the saddest day of the year: the day that the wait for a new Slow Horses season begins.
October 30, 2025 at 2:55 AM
It’s the saddest day of the year: the day that the wait for a new Slow Horses season begins.
Practically Wild Kingdom out here. IYKYK
October 29, 2025 at 4:43 AM
Practically Wild Kingdom out here. IYKYK
Doesn’t look like a comfortable way to drink.
October 28, 2025 at 2:46 PM
Doesn’t look like a comfortable way to drink.
Bought two $8.95 items at a small shop. 60-something clerk adds it up with mental math: “2 times 9 minus 10. $17.90” I told her “no one under 60 would understand what you just did.” She beamed.
October 25, 2025 at 9:59 PM
Bought two $8.95 items at a small shop. 60-something clerk adds it up with mental math: “2 times 9 minus 10. $17.90” I told her “no one under 60 would understand what you just did.” She beamed.
Reposted by Mark Marley
New paper drop led by former postdoc Jacob Adler now at ASU. www.nature.com/articles/s43...
Pressure, temperature, & composition affect the transport and morphology of sedimentary flows on Mars - in space and time!
☠️ beware of using earth analogs to interpret Hesperian and Amazonian deposits☠️
Pressure, temperature, & composition affect the transport and morphology of sedimentary flows on Mars - in space and time!
☠️ beware of using earth analogs to interpret Hesperian and Amazonian deposits☠️
Microclimate governs the morphology of sediment flows on Mars - Communications Earth & Environment
Gravitational flow deposits on Earth may not be meaningful analogues for those on Mars or other planetary bodies according to laboratory experiments conducted at Mars-like temperatures and pressures w...
www.nature.com
October 24, 2025 at 7:12 PM
New paper drop led by former postdoc Jacob Adler now at ASU. www.nature.com/articles/s43...
Pressure, temperature, & composition affect the transport and morphology of sedimentary flows on Mars - in space and time!
☠️ beware of using earth analogs to interpret Hesperian and Amazonian deposits☠️
Pressure, temperature, & composition affect the transport and morphology of sedimentary flows on Mars - in space and time!
☠️ beware of using earth analogs to interpret Hesperian and Amazonian deposits☠️
Ahh found Comet Lemmon.
October 24, 2025 at 1:46 AM
Ahh found Comet Lemmon.
Nice article about Comet Lemon and its discovery by the Catalina Sky Survey on the front page of the Tucson paper this morning. tucson.com/news/local/s...
Comet newly discovered from Mt. Lemmon now appearing in northern sky
The comet newly discovered from a center near Tucson is the brightest comet of 2025.
tucson.com
October 23, 2025 at 1:59 PM
Nice article about Comet Lemon and its discovery by the Catalina Sky Survey on the front page of the Tucson paper this morning. tucson.com/news/local/s...
Sign up for Jack's talk on Zoom or come by LPL to see his radar instruments in person.
TONIGHT! Don't miss this LPL Evening Lecture featuring a talk by Dr. Jack Holt!
Make sure the next LPL Evening Lecture is on your calendar! On October 22, Dr. Jack Holt will present "Studying Earth's Glaciers to Unlock Martian Mysteries." We encourage in-person attendees to come early to see special exhibits! www.lpl.arizona.edu/events/lpl-e...
October 22, 2025 at 9:16 PM
Sign up for Jack's talk on Zoom or come by LPL to see his radar instruments in person.