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Mark Cheung

@markcheung.bsky.social
435 followers 293 following 11 posts

Astro | Helio | Space Weather | ML Science Director, Space & Astronomy @CSIRO; OMO

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Reposted by Mark Cheung
Dr Ryan MacDonald @distantworlds.space · 10/09/2025
Statistically, our current four-transit spectrum of TRAPPIST-1e can also be fit by a flat line (i.e. a featureless spectrum). So we can't rule out a bare rock with these data. There's also the important caveat that an incomplete stellar contamination correction could also imprint spectral features.
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Max Planck Institute for Solar System Research @mpsgoettingen.bsky.social · 11/09/2025
In Göttingen tonight? Check out the public talk by @esa.int astronaut @astromatthias.esa.int at 19:00. The talk will be held in German at the central campus of @uni-goettingen.de quantum25.dpg-tagungen.de/nachrichten/...
Poster describing public talk by Mathias Maurer
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🪾santiago, phd 🐈‍⬛ @santiagokique.bsky.social · 02/08/2025
Terence Tao (@teorth.bsky.social) has written a thread on Mastodon about the impact of the federal grant freeze to UCLA, particularly to his own field of Mathematics. UCLA's IPAM (Institute of Pure and Applied Mathematics) could shut down entirely mathstodon.xyz/@tao/1149568...
mathstodon.xyz
Terence Tao (@tao@mathstodon.xyz)
The current administration in the US has, through various funding agencies such as the NSF and NIH, has recently suspended virtually all federal grants to my home university, UCLA (including my own p...
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Sean Carroll @seanmcarroll.bsky.social · 16/07/2025
Here is my colleague Adam Riess, Nobel laureate, sharing his thoughts on advocating for science at a recent event at the US Capitol. aas.org/posts/news/2...
aas.org
My Recent Experience Advocating for Science | American Astronomical Society
AAS member and Nobel Prize Laureate Adam Riess describes his experience giving a speech to Congress at a recent event at the Capitol, "A Science Fair of Canceled Grants."
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Institute of Astronomy, Cambridge @cambridgeastro.bsky.social · 12/07/2025
We are saddened to report the passing of Cyril Hazard (18 March 1928 – 14 June 2025). Cyril was a pioneering radio astronomer whose work on quasars helped transform our understanding of the Universe. www.ast.cam.ac.uk/news/cyril-h...
ast.cam.ac.uk
Cyril Hazard (18 March 1928 – 14 June 2025) | Institute of Astronomy
We are saddened to report the passing of Cyril Hazard (18 March 1928 – 14 June 2025). Cyril was a pioneering radio astronomer whose work on quasars helped transform our understanding of the Universe.
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Science & Medicine at ANU @scienceanu.bsky.social · 08/07/2025
Congratulations to Professor Naomi McClure-Griffiths and Li Yusen from ANU who are among six astronomers to receive awards at the Annual Scientific Meeting of the Australian Astronomy Society in 2025. Read more: science.anu.edu.au/news-events/...
Li Yusen Bok Prize winnerProfessor Naomi McLure Griffiths, Ellery Lecture winner
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Kyle Cranmer @kylecranmer.bsky.social · 03/07/2025
As always, a very nice talk from Francois Lanusse: Generative Al for Inverse Problems and Forecasting Slides: eiffl.github.io/talks/Paris2...
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American Astronomical Society (AAS) @aas.org · 03/07/2025
Learn more about the reconciliation bill being voted on by the House today, and how this is different from the appropriations process that determines funding for our federal science agencies:
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Dr Chris Bridges @chrisbridges.bsky.social · 01/07/2025
Huh? #FPGA plus #lasers?! A fancy #job indeed! www.linkedin.com/posts/drchri...
linkedin.com
We're hiring in FPGA / VHDL for lasers! | Chris Bridges
We're hiring in FPGA / VHDL for lasers! Please share to your recently graduating students! https://lnkd.in/e_mNg4bB
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Andy Lawrence @e-astronomer.bsky.social · 30/06/2025
Anybody got a picture of Annie Walker? Possibly first British professional astronomer, later moved to Oz. www.theguardian.com/science/2025...
theguardian.com
Unsung observatory worker was UK’s first professional female astronomer, experts say
Cambridge’s Institute of Astronomy is trying to find a photo of Annie Walker, who died in 1940, to give her star billing
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CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 15/05/2025
This includes working with all these excellent partners: - Intl. Science School - @spaceaustralia.com - @sydney.edu.au - @ozgrav.bsky.social - ARC CoE Dark Matter - Swinburne Uni. - Wheeler Centre - @queersinscience.bsky.social Keep an eye out for event pages and ticket links! 2/3 🔭
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Tara Murphy @taramurphy.bsky.social · 29/05/2025
Ziteng (Andy) Wang @zitengwang.bsky.social tells the story behind the discovery of this unusual long period transient, in his article for @aunz.theconversation.com. theconversation.com/x-rays-have-... #RadioAstronomy #AstroSci
theconversation.com
X-rays have revealed a mysterious cosmic object never before seen in our galaxy
The object doesn’t resemble any known type of star or system in the Milky Way.
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ESA Space Science @science.esa.int · 27/05/2025
Totalling around 120 hours of observing time, this is the longest the NASA/ESA/CSA James Webb Space Telescope has ever focused on a single target. The deep field aims to probe the Cosmic Dawn, when the Universe was only a few million years old. Read more 👉 www.esa.int/ESA_Multimed... 🔭 🧪 ☄️
A field of galaxies in space, dominated by an enormous, bright-white elliptical galaxy that is the core of a massive galaxy cluster. Many other elliptical galaxies can be seen around it. Also around it are short, curved, glowing red lines, which are images of distant background galaxies magnified and warped by gravitational lensing. A couple of foreground stars appear large and bright with long spikes around them.
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Tara Murphy @taramurphy.bsky.social · 15/05/2025
I am super excited to be hosting the incredible Katie Mack @astrokatie.com presenting "The End of Everything" at the University of Sydney @sydney.edu.au Join us on July 10 to learn about five ways the Universe might die! Registration is free... www.sydney.edu.au/engage/event... ⚛️ #Astronomy ⚛️
sydney.edu.au
Katie Mack: The end of everything
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Vincent Ledvina @vincentledvina.bsky.social · 21/04/2025
One of the largest coronal holes observed by SDO is now facing Earth! #heliophysics
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Mark Cheung @markcheung.bsky.social · 17/04/2025
#Radioastronomy #job alert. We’re looking to hire a Lead Scientist for Parkes Observatory. Murriyang, our 64m radio telescope, aka The Dish is currently getting an exciting upgrade with commissioning of the CryoPAF instrument. Check out this job at CSIRO: jobs.csiro.au/job/Parkes%2...
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ETH Zurich @ethz.ch · 10/04/2025
Was treibt Europas #Raumfahrt voran? Professor Thomas Zurbuchen spricht über seine Vision für ETH Zürich Space, die Stärken Europas, Herausforderungen im Vergleich zu den USA – und warum Mut, Teamgeist und Innovation entscheidend für die Zukunft im All sind. Jetzt lesen:
dglr.de
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. - DGLR: Die Bedeutung europäischer Raumfahrtforschung: Prof. Dr. Thomas Zurbuchen im Interview
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Tara Murphy @taramurphy.bsky.social · 18/03/2025
First images from the Square Kilometre Array Low Frequency (SKA-Low)! Taken with only 1,024 of the planned 131,072 antennas, and it's already looking good :) #RadioAstronomy
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ESA Operations @operations.esa.int · 18/03/2025
The disappearance of Gaia! On 4 March, astronomer Zhuo-Xiao Wang captured this view of the sudden disappearance of ESA’s Gaia spacecraft. Credit: Zhuo-Xiao Wang, CC BY-SA 3.0 IGO Observations performed on 4 March 2025 using an 11-inch telescope from Beijing, China (MPC site code: P13).
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Mark Cheung @markcheung.bsky.social · 15/03/2025
So cool! #technosignature #radioastronomy
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Jonathan McDowell @planet4589.bsky.social · 12/03/2025
In a short RNAAS note now on arxiv, arxiv.org/abs/2503.07972 I discuss in more detail the suggestion of Loeb and Cloete that 'dark comet' 2005 VL1 is actually the old Venera-2 space probe. (It's not.)
arxiv.org
2005 VL1 is not Venera-2
The solar system object 2005 VL1 passed close to Earth in late 1965. It has been suggested that it is actually the space probe Venera-2. However, a comparison of the orbits presented in this note demo...
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CosmicRami 🏳️‍🌈🏳️‍⚧️ @rami.spaceaustralia.com · 12/03/2025
👀👀👀 Two exciting preprints today from Aussie institutions and scientists! 🔭☄️ 1. A 41-sec radio pulsar! Slowest pulsar we know about is ~23-secs and then there are these mysterious long-period transients that have rotations periods of mins to hours. This one fits between them!
arxiv.org
The discovery of a 41-second radio pulsar PSR J0311+1402 with ASKAP
The emerging population of long-period radio transients (LPTs) show both similarities and differences with normal pulsars. A key difference is that their radio emission is too bright to be powered sol...
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Dr. Craig DeForest ☀️ @craig.deforest.org · 12/03/2025
PUNCH is orbiting and all four spacecraft are Sun-pointed. I can sleep now. ☀️🛰️🔭🚀
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Benjamin Pope @benjaminpope.bsky.social · 09/03/2025
Submitted your PhD in the last three years (but before 2025)? There is an *awesome* prize fellowship for you at Macquarie in Sydney: the Lighthouse Fellowship. If you're into exoplanets, stars, and/or stats, get in touch with me or any of the other faculty and we can talk about it!
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Brett Morris @brettmorr.is · 24/02/2025
Tired of wondering which atomic lines are in your spectra? You need: *whose line is it anyway?* An interactive tool for identifying atomic spectral lines. 🧪🔭 #stars install: pip install whoseline source: github.com/bmorris3/who...
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Mark Cheung @markcheung.bsky.social · 22/02/2025
We are looking for an Observatory Manager to lead the team at Parkes Observatory. Yes, come work at Murriyang, otherwise known as The Dish. #radioastronomy jobs.csiro.au/job/Parkes%2...
jobs.csiro.au
Observatory Manager - Parkes Observatory
Observatory Manager - Parkes Observatory
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Tara Murphy @taramurphy.bsky.social · 11/02/2025
Reading back through #RadioAstronomy transients history. The first variable phenomenon detected in radio waves was a flare from our own Sun. This snippet from Nature describes the result (discovered in 1942, but published in 1946 due to military restrictions). www.nature.com/articles/157...
The introductory paragraph from the Nature article describing the first detection of radio emission from the Sun. The title is "Solar Radiations in the 4-6 Metre Radio Wave-Length Band". The author is J. S. Hey. 

The full article is available here: https://www.nature.com/articles/157047b0
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Conaire Deagan @conairedeagan.bsky.social · 24/01/2025
Sharing this proposed Sydney Harbour Area Stars and Planets Meeting link, organised by my supervisor, Dr Ben Montet doodle.com/group-poll/p... Details in the images, link for getting a consensus on dates. I’ll likely present so please come!
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Tara Murphy @taramurphy.bsky.social · 15/01/2025
Hot off the press! One of my students, Yu Wing (Joshua) Lee, has discovered a new radio transient (along with @manishacaleb.bsky.social). Read more about "The Stellar Object That’s Too Slow to Shine" in their Conversation article: theconversation.com/blinking-rad... #RadioAstronomy
theconversation.com
Blinking radio pulses from space hint at a cosmic object that ‘shouldn’t exist’
The slowest ‘cosmic lighthouse’ ever found challenges our understanding of how neutron stars work.
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Professor Carole Mundell @cmundell.esa.int · 14/01/2025
After a world-first Earth-Moon double gravity assist in August 2024, our @esa.int #ESAJuice mission passed its hottest point enroute to Jupiter. On 1 January 2025 🎉, #ESAJuice was just 0.64 AU from the Sun. A flawless deep space manoeuvre was executed at midnight to adjust our trajectory to Venus!
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Astrobites @astrobites.bsky.social · 13/01/2025
Go help the solar observatory do the hardest possible puzzle of the sun in the exhibit hall!! #AAS245 🔭✨
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CanberraDSN 📡 @canberradsn.bsky.social · 27/12/2024
Deep Space Station 34 received a clear beacon tone from the #ParkerSolarProbe after its close encounter with the Sun on 24th December.📡🛰️☀️ Congratulations to the mission science team & engineers @jhuapl and @NASA on this historic achievement. #DSS34 blogs.nasa.gov/parkersolarpro…
A 34-metre diameter antenna dish, Deep Space Station 34 points skyward, toward a blazing Sun in a clear blue sky. The antenna is receiving signals from the Parker Solar Probe after its successful closest approach encounter flyby of the Sun on the 24th December 2024.
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Dr. Craig DeForest ☀️ @craig.deforest.org · 10/12/2024
Congratulations to my colleagues James Mason, Dan Seaton, Cristina Kay, Amal Chandran, and Aaron Magner on a phenomenal video on the phenomenal #CubeSat mission #SunCET! Very nice bit of science outreach at #AGU2024! ☀️🧪🛰️🔭🎢
youtube.com
The Never-Before-Seen Sun – Sun Coronal Ejection Tracker (SunCET)
YouTube video by WebsEdge Science
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Miles Cranmer @milescranmer.bsky.social · 09/12/2024
I wrote this new symbolic differentiation engine called DynamicDiff.jl: github.com/MilesCranmer... It's really really fast at differentiating runtime-generated expressions – no compilation needed!
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adamplatform.bsky.social @adamplatform.bsky.social · 05/12/2024
Awesome huge Phytoplankton Bloom covering 1700km2 in the Ocean!! #Copernicus #Sentinel3 Image detected on Dec. 3rd shows the gorgeous swirls off the Southern Australian coast. #Melbourne #Australia
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Rob Kavanagh @robkavanagh.bsky.social · 05/12/2024
Our recent work has just been published in A&A! We developed a retrieval framework for the large-scale magnetic fields of objects emitting radio bursts driven by the electron cyclotron maser (ECM) instability. We applied it to the brown dwarf J0623, and found that it has a large magnetic obliquity!
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SpaceAustralia.com @spaceaustralia.com · 03/12/2024
MeerKAT Pulsar Timing Array team has announced evidence for the Gravitational Wave Background (GWB)! @cosmicrami.com had a chat with lead author @astromattmiles.bsky.social from @ozgrav.bsky.social www.spaceaustralia.com/feature/mpta... 📸 C. Knox/Swinburne/OzGrav/SARAO #SpaceAustralia 🔭🧪 1/3
Graphic that shows a single dish from the MeerKAT telescope, and it is silhouetted across a background of illustrated supermassive black holes and space-time, represented by a warped grid.
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Mark Cheung @markcheung.bsky.social · 02/12/2024
Will the next US Solar & Space Decadal Survey acknowledge we need a follow-on, improved SDO? www.nationalacademies.org/event/44121_...
nationalacademies.org
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Ana Marasović @anamarasovic.bsky.social · 02/12/2024
I learned about this paper (arxiv.org/abs/2406.09413) when Alexei gave this wonderful talk at the U. They trained 60K diffusion models, each for a different person's visual identity. Sampling weights from this set creates a model for a novel identity.
arxiv.org
Interpreting the Weight Space of Customized Diffusion Models
We investigate the space of weights spanned by a large collection of customized diffusion models. We populate this space by creating a dataset of over 60,000 models, each of which is a base model fine...
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A/Prof Natasha Hurley-Walker @colourfulcosmos.bsky.social · 02/12/2024
Out now in @theconversation.com, I write about our discovery of the first long-period radio transient with an optical counterpart -- our first clue to the progenitors of this mysterious class of objects! theconversation.com/astronomers-...
theconversation.com
Astronomers have pinpointed the origin of mysterious repeating radio bursts from space
By searching sparsely populated regions of the galaxy, astronomers have for the first time found the source of a kind of signal that has puzzled them for years.
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Mark Cheung @markcheung.bsky.social · 01/12/2024
solarnews.nso.edu/sdo-iris-out...
solarnews.nso.edu
Extended outage of SDO/HMI, SDO/AIA, and IRIS Data Processing and JSOC Data Service - SolarNews
On Tuesday November 26 a 4-inch chilled-water pipe in the Solar Dynamics Observatory (SDO) Joint Science Operations Center (JSOC) server room broke. This caused major flooding in the building and exte...
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Mark Cheung @markcheung.bsky.social · 28/11/2024
Just to be clear, SDO the spacecraft and payloads are fine. The data processing at Stanford is interrupted due to said server room incident. For those who can’t wait, GOES SUVI has some EUV channels similar to SDO AIA. www.swpc.noaa.gov/products/goe...
swpc.noaa.gov
GOES Solar Ultraviolet Imager (SUVI) | NOAA / NWS Space Weather Prediction Center
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Tara Murphy @taramurphy.bsky.social · 26/11/2024
Jupiter looks particularly impressive because its strong magnetic field causes huge radiation belts which we can detect at #RadioAstronomy wavelengths. There's a full explanation of the image on this ATNF picture of the day page by @elenchically.bsky.social: www.atnf.csiro.au/ATNF-DailyIm...
atnf.csiro.au
ATNF Daily Astronomy Picture
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Tara Murphy @taramurphy.bsky.social · 26/11/2024
When we're searching for radio transients we accidentally find other things that change between images... like planets! This image by our transient hunting guru Emil Lenc (@elenchically.bsky.social) shows some of the planets (plus the Moon) we've detected in our ASKAP surveys. #RadioAstronomy
Images of radio detected planets taken with the ASKAP telescope. They are: Mercury, Venus, Jupiter, Saturn, Neptune and the Moon (not a planet!). False colour image scales since all radio images are black and white. Image Credit: Emil Lenc.
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François Fleuret @francois.fleuret.org · 26/11/2024
My deep learning course at the University of Geneva is available on-line. 1000+ slides, ~20h of screen-casts. Full of examples in PyTorch. fleuret.org/dlc/ And my "Little Book of Deep Learning" is available as a phone-formatted pdf (nearing 700k downloads!) fleuret.org/lbdl/
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Tara Murphy @taramurphy.bsky.social · 23/11/2024
We are about half way through our survey, with the Australian SKA Pathfinder telescope. In the next two years we will double the number of observations (and the number of discoveries) 🙂 Here's picture of our great telescope!
The ASKAP telescope in Western Australia. Very blue sky with red desert sand. A large dish in the foreground with many in the background. Image Credit: CSIRO
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Mark Cheung @markcheung.bsky.social · 25/11/2024
I’ve missed the technical posts and discussions. Looking forward to being illuminated by all the scattering interactions here.
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Kyle Cranmer @kylecranmer.bsky.social · 23/11/2024
Write math on 🦋 with UnicodeIt! For example: θ ∈ ℝⁿ or pp̅ → μ⁺μ⁻ Use website or install system-wide in Linux, macOS, or windows www.unicodeit.net (Created several years ago with @svenkreiss.bsky.social)
An screenshot of UnicodeIt website
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Stephan Hoyer @handle.invalid · 15/11/2024
My teammates at Google finally published (in Nature!) one of my favorite projects: using millions of cellphones to map the ionosphere and improve GPS location accuracy: research.google/blog/mapping...
research.google
Mapping the ionosphere with the power of Android
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Karen Masters @karenlmasters.bsky.social · 20/11/2024
We're back after a break with CORF discussion of co-ordination efforts between NRAO and satellite constellation companies. 🔭🧪 Livestream: vimeo.com/event/4686731
vimeo.com
Day 1-CORF Fall Meeting 2024
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