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Mark Marley @markmarley.bsky.social · 2d

I gave a homework assignment in my Exoplanets grad class to define what would be taught as “normal” architecture to grad students in the TRAPPIST-1 system.

David Grinspoon @drfunkyspoon.bsky.social · 3d

We were also taught that (2)
the “architecture” of other planetary systems would likely resemble ours- a few rocky worlds close in and a few gas giants farther out past the “snow line”. The processes that led to that were (we thought) understood. We expected the solar system to be “normal”.
WRONG!

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Mark Marley @markmarley.bsky.social · 2d

The joke that the only time you hear from your adult children is when they need the Netflix code is a bit too close for comfort.

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Mark Marley @markmarley.bsky.social · 3d

Last night at 7PM, a little drama. First time we’ve had two since spring. I was outside around the to the right enjoying the sunset at the time.

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Mark Marley @markmarley.bsky.social · 3d

I happened to see this live. I’m not sure what was spooking him from the roof.

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Reposted by Mark Marley

Paul Byrne @theplanetaryguy.bsky.social · 4d

A few hours ago, Comet 3I/ATLAS passed about 28 million km from Mars.

This was the best opportunity we'll have to image the interstellar visitor from spacecraft.

When those data are available, I'll share them!

A screenshot from NASA's Eyes on the Solar System, showing the relative positions of 3I/ATLAS and Mars as of about 1700 Central time today.

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Reposted by Mark Marley

Kevin Hainline @kevinhainline.bsky.social · 6d

We find these cold brown dwarfs all over the place in the survey. Some of them are so cold that their surface is about the same as what Tucson can get to in the summer. This object, JADES-GS-BD-5, which we observe with NIRCam and MIRI, has a temperature of 322 K, or only 120° Fahrenheit (49° C)!

Another plot from the survey, showing JADES-GS-BD-5, with the observed data points plotted as black points, and the fit as a squiggly line that matches the observed data points well. The distance we predict from the fit is only 70 parsecs, and the temperature is 322 Kelvin. Beneath the fit plot, there are thumbnails showing the object as seen in different NIRCam and MIRI filters, out to 12.8 microns.

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Reposted by Mark Marley

Kevin Hainline @kevinhainline.bsky.social · 6d

I wrote another paper! And yes it's about brown dwarfs wait don't go anywhere they're really neat

arxiv.org/abs/2510.00111

JADES: An Abundance of Ultra-Distant T- and Y-Dwarfs in Deep Extragalactic Data

Ultra-cool T- (T$_{\mathrm{eff}} \approx$ 500 - 1200 K) and Y-dwarfs (T$_{\mathrm{eff}}$ $\lessapprox 500$ K) have historically been found only a few hundred parsecs from the Sun. The sensitivity and ...

arxiv.org

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Mark Marley @markmarley.bsky.social · 5d

My take on the nifty PH3 detection in a brown dwarf is quoted here. Still a mystery why we haven't found PH3 in more mainstream brown dwarfs. cen.acs.org/physical-che...

Phosphine found in brown dwarf’s atmosphere

The first-time finding of appreciable amounts of phosphine in a brown dwarf suggests it may be too soon to use the molecule as a sign of alien life

cen.acs.org

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Reposted by Mark Marley

Joshua J. Friedman @joshuajfriedman.com · 6d

One of my favorite anecdotes from THE PREHISTORY OF THE FAR SIDE: "That doesn't sound like the Jane Goodall we know."

A few days after this cartoon was published, my syndicate received a very indignant letter from someone representing the Jane Goodall Institute.
Not only did my syndicate and I both get read the Riot Act, there was a vague implication that litigation over this cartoon might be around the corner.
I was horrified. Not so much from a fear of being sued (I just couldn't see how this cartoon could be construed as anything but silly, but because of my deep respect for Jane Goodall and her well-known contributions to pri-matology. The last thing in the world I would have intentionally done was offend Dr. Goodall in any way.
Before I had a chance to write my apology, another complication arose.
The National Geographic Society contacted my syndicate and expressed a

desire to reprint the cartoon in a special centennial issue of their magazine. My editor, aware of what had just occurred, declined, explaining why.
Apparently, whoever it was that sent the inquiry from National Geographic was shocked. They told my editor that "that doesn't sound like the Jane Goodall we know." They did some checking themselves, and an interesting fact was eventually discovered: Jane Goodall loved the cartoon. Furthermore, she was totally unaware that any of this "stuff" was going on. Some phone calls were made, and the cartoon was not only reprinted in the centennial issue of National Geographic, but was also used by her Institute on a T-shirt for fund-raising purposes.
I've since had an opportunity to visit Dr. Goodall at her research facility in Gombe. It's a wonderful place (sort of like right out of National Geographic).
"To refer to Dr. Goodall as a tramp is inexcusable even by a self-described 'loony' as Larson. The cartoon was incredibly offensive and in such poor taste that readers might well question the editorial judgment of running such an atrocity in a newspaper that reputes to be supplying news to persons with a better than average intelligence. The cartoon and its message were absolutely stupid." —Excerpt from the above-mentioned letter that started the ruckus

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Reposted by Mark Marley

Katharine Hayhoe @katharinehayhoe.com · 6d

The world has lost its most powerful advocate for nature and hope. Yet many remain who will continue her legacy and I know she will continue to inspire generations more.

A screenshot of a post by the Jane Goodall Institute on LinkedIn stating that they learned that Dr. Goodall passed away due to natural causes in California while on her speaking to her current speaking tour there.

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Reposted by Mark Marley

UArizona Lunar and Planetary Laboratory @uarizonalpl.bsky.social · 7d

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...

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Reposted by Mark Marley

Steward Observatory, University of Arizona @stewardobservatory.bsky.social · 7d

We are pleased to celebrate the great news that MIT has joined GMTO as the newest member of our international consortium. Read about this major milestone in the progression of GMTO to completion: bit.ly/3IOpyzv

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Mark Marley @markmarley.bsky.social · 7d

My lifetime first science paper was Lunine, Hubbard, and Marley (1986). Here we are getting the band back together 39 years later. Haven’t changed a bit.

Topic then was brown dwarfs and I’m still working on them.

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Mark Marley @markmarley.bsky.social · 9d

I assume so but the video cut out and didn’t show the return to ground level. I was away from home at the time.

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Reposted by Mark Marley

Sarah E Moran @offallingstars.bsky.social · 15d

Life news -- starting Fall 2026, I'll be an Assistant Prof in University of Maryland, College Park's Astronomy Department!

I'll be starting up a lab to measure all the substellar cloud things 🌤️🪐✨ and continuing alllllll the atmospheric model things

Lowkey obsessed with the mascot #FeartheTurtle

the seal of the University of Maryland. It has the red, white, black, and gold banners of the Maryland flag in a circle and with the year 1856 on either side.

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Reposted by Mark Marley

Paul Voosen @voosen.me · 19d

Just in from the @planetarysociety.bsky.social: The counter CR proposed by the Dems to keep the government open includes language protecting NASA missions in "operation, including extended operations, or under development or formulation."

This is not in the CR proposed by House Rs. So we'll see.

democrats-appropriations.house.gov

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Reposted by Mark Marley

Dr. Jessie Christiansen @aussiastronomer.bsky.social · 20d

Sometimes 2025 just feels like a lot, and you need an excuse to celebrate your fabulous team (and the whole exoplanet community!) reaching a new milestone…

Happy 6,000 Confirmed Exoplanets Day, everybody!!!!

(You may recognize the narrator of the video at the link! 🫣)

www.nasa.gov/universe/exo...

A close-up photo of a box of cupcakes with gold candles spelling out ‘6000’.

A group of smiling people - scientists, engineers, data analysts and writers - standing behind a table of goodies.

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Mark Marley @markmarley.bsky.social · 21d

Hamilton has spectacular drone videos of Icelandic eruptions so should be a compelling talk!

UArizona Lunar and Planetary Laboratory @uarizonalpl.bsky.social · 21d

TONIGHT! Stop by to listen to Dr. Christopher Hamilton's evening lecture. Guests can come early to see some special exhibits as well!

UArizona Lunar and Planetary Laboratory @uarizonalpl.bsky.social · Aug 20

Dr. Hamilton is the first in our "Space on Earth" LPL Evening Lectures for Fall 2025! Come listen to Dr. Hamilton speak on "Mars on Earth: Testing Tomorrow's Mars Missions in Iceland." More information can be found here: www.lpl.arizona.edu/calendar/eve...

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Mark Marley @markmarley.bsky.social · 22d

Except Pyrex isn't borosilicate any more. The accounting pirates has their say.

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Reposted by Mark Marley

Laura Kreidberg @lkreidberg.bsky.social · 23d

We have job opportunities in the APEx department at MPIA - please spread the word!

Postdocs: aas.org/jobregister/...
Tenure-track staff: aas.org/jobregister/...
Max Planck Research Group Leaders: aas.org/jobregister/...

+ happy to host ERC, Humboldt, and other third-party funds.

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Mark Marley @markmarley.bsky.social · 23d

I was stealing a figure from that just an hour ago! Glad you still like it and indeed he is the Ty we should all know.

Mark Marley @markmarley.bsky.social · 24d

This morning an idea came to me about how to work brown dwarfs into the upcoming wedding toast I will deliver at my daughter’s wedding. Hopefully I will come to my senses before the big day.

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Reposted by Mark Marley

Gene J. Mikulka @genejm1017.bsky.social · 24d

Never forget : September 13th , 1999. #Space1999

a picture of the moon with the words massive nuclear

ALT: a picture of the moon with the words massive nuclear

media.tenor.com

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Mark Marley @markmarley.bsky.social · 25d

He is 💯 certain there is something to eat here. Must be seeing the LED.

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Reposted by Mark Marley

Tony DelGenio @tonydelgenio.bsky.social · 26d

Great to see this paper come out, a lot of work by many people went into the development of this model.

Chris Colose @ccolose.bsky.social · 26d

Our description paper of v2 of the planet version of the GISS model, led by Kostas Tsigaridis,
ROCKE-3D 2.0: an updated general circulation model for simulating the climates of rocky planets
gmd.copernicus.org/articles/18/...

ROCKE-3D 2.0: an updated general circulation model for simulating the climates of rocky planets

Abstract. We present the second generation of ROCKE-3D (Resolving Orbital and Climate Keys of Earth and Extraterrestrial Environments with Dynamics), a generalized three-dimensional general circulatio...

gmd.copernicus.org

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