Mark Cheung
@markcheung.bsky.social
📤 416
📥 288
📝 11
Astro | Helio | Space Weather | ML Science Director, Space & Astronomy @CSIRO; OMO
reposted by
Mark Cheung
Dr Ryan MacDonald
about 2 months ago
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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Mark Cheung
Max Planck Institute for Solar System Research
about 2 months ago
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/...
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Mark Cheung
santiago, phd 🐈⬛
3 months ago
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...
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Terence Tao (@
[email protected]
)
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...
https://mathstodon.xyz/@tao/114956840959338146
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Mark Cheung
Sean Carroll
3 months ago
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...
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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."
https://aas.org/posts/news/2025/07/my-recent-experience-advocating-science
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Mark Cheung
Institute of Astronomy, Cambridge
4 months ago
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...
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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.
https://www.ast.cam.ac.uk/news/cyril-hazard-18-march-1928-14-june-2025
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Mark Cheung
Science & Medicine at ANU
4 months ago
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/...
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Mark Cheung
Kyle Cranmer
4 months ago
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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Mark Cheung
American Astronomical Society (AAS)
4 months ago
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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Mark Cheung
Dr Chris Bridges
4 months ago
Huh?
#FPGA
plus
#lasers
?! A fancy
#job
indeed!
www.linkedin.com/posts/drchri...
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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
https://www.linkedin.com/posts/drchrisbridges_were-hiring-in-fpga-vhdl-for-lasers-please-activity-7345366740358365184-l9Ui?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAHjwlEBtdbZ0xBGh26VhzM9sAM5rUhowSk
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Mark Cheung
Andy Lawrence
4 months ago
Anybody got a picture of Annie Walker? Possibly first British professional astronomer, later moved to Oz.
www.theguardian.com/science/2025...
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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
https://www.theguardian.com/science/2025/jun/30/unsung-observatory-worker-uk-first-professional-female-astronomer-annie-walker
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Mark Cheung
CosmicRami 🏳️🌈🏳️⚧️
5 months ago
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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Mark Cheung
Tara Murphy
5 months ago
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
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Mark Cheung
ESA Space Science
5 months ago
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...
🔭 🧪 ☄️
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Mark Cheung
Tara Murphy
5 months ago
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
⚛️
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Katie Mack: The end of everything
https://www.sydney.edu.au/engage/events-sponsorships/sydney-ideas/2025/katie-mack-the-end-of-everything.html
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Mark Cheung
Vincent Ledvina
6 months ago
One of the largest coronal holes observed by SDO is now facing Earth!
#heliophysics
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#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...
6 months ago
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Mark Cheung
ETH Zurich
7 months ago
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:
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Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. - DGLR: Die Bedeutung europäischer Raumfahrtforschung: Prof. Dr. Thomas Zurbuchen im Interview
https://www.dglr.de/nc/informieren/meldungen/newsmeldung-einzel/article/die-bedeutung-europaeischer-raumfahrtforschung-prof-dr-thomas-zurbuchen-im-interview/
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reposted by
Mark Cheung
Tara Murphy
7 months ago
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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Mark Cheung
ESA Operations
7 months ago
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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So cool!
#technosignature
#radioastronomy
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8 months ago
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Mark Cheung
Jonathan McDowell
8 months ago
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.)
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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...
https://arxiv.org/abs/2503.07972
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Mark Cheung
CosmicRami 🏳️🌈🏳️⚧️
8 months ago
👀👀👀 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!
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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...
https://arxiv.org/abs/2503.07936
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reposted by
Mark Cheung
Dr. Craig DeForest ☀️
8 months ago
PUNCH is orbiting and all four spacecraft are Sun-pointed. I can sleep now. ☀️🛰️🔭🚀
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Mark Cheung
Benjamin Pope
8 months ago
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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reposted by
Mark Cheung
Brett Morris
8 months ago
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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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...
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Observatory Manager - Parkes Observatory
Observatory Manager - Parkes Observatory
https://jobs.csiro.au/job/Parkes%2C-NSW-Observatory-Manager-Parkes-Observatory/1060694666/
8 months ago
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reposted by
Mark Cheung
Tara Murphy
9 months ago
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...
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reposted by
Mark Cheung
Conaire Deagan
9 months ago
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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reposted by
Mark Cheung
Tara Murphy
9 months ago
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
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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.
https://theconversation.com/blinking-radio-pulses-from-space-hint-at-a-cosmic-object-that-shouldnt-exist-246663
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reposted by
Mark Cheung
Professor Carole Mundell
10 months ago
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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Mark Cheung
Astrobites
10 months ago
Go help the solar observatory do the hardest possible puzzle of the sun in the exhibit hall!!
#AAS245
🔭✨
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Mark Cheung
CanberraDSN 📡
10 months ago
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…
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reposted by
Mark Cheung
Dr. Craig DeForest ☀️
11 months ago
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
! ☀️🧪🛰️🔭🎢
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The Never-Before-Seen Sun – Sun Coronal Ejection Tracker (SunCET)
YouTube video by WebsEdge Science
https://www.youtube.com/watch?v=6uV5dkf4rJg
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reposted by
Mark Cheung
Miles Cranmer
11 months ago
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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Mark Cheung
11 months ago
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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reposted by
Mark Cheung
Rob Kavanagh
11 months ago
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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Mark Cheung
SpaceAustralia.com
11 months ago
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
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Will the next US Solar & Space Decadal Survey acknowledge we need a follow-on, improved SDO?
www.nationalacademies.org/event/44121_...
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https://www.nationalacademies.org/event/44121_12-2024_report-release-event-the-next-decade-of-discovery-in-solar-and-space-physics-exploring-and-safeguarding-humanitys-home-in-space
11 months ago
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Mark Cheung
Ana Marasović
11 months ago
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.
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Mark Cheung
A/Prof Natasha Hurley-Walker
11 months ago
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-...
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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.
https://theconversation.com/astronomers-have-pinpointed-the-origin-of-mysterious-repeating-radio-bursts-from-space-244920
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solarnews.nso.edu/sdo-iris-out...
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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...
https://solarnews.nso.edu/sdo-iris-outage-2024/
11 months ago
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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...
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11 months ago
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reposted by
Mark Cheung
Tara Murphy
11 months ago
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...
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ATNF Daily Astronomy Picture
https://www.atnf.csiro.au/ATNF-DailyImage/archive/2020/30-Mar-2020.html
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Mark Cheung
Tara Murphy
11 months ago
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
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reposted by
Mark Cheung
François Fleuret
11 months ago
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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Mark Cheung
Tara Murphy
11 months ago
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!
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I’ve missed the technical posts and discussions. Looking forward to being illuminated by all the scattering interactions here.
11 months ago
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reposted by
Mark Cheung
Kyle Cranmer
11 months ago
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
)
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reposted by
Mark Cheung
Stephan Hoyer
12 months ago
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...
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Mapping the ionosphere with the power of Android
http://research.google/blog/mapping-the-ionosphere-with-the-power-of-android/
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Mark Cheung
Karen Masters
11 months ago
We're back after a break with CORF discussion of co-ordination efforts between NRAO and satellite constellation companies. 🔭🧪 Livestream:
vimeo.com/event/4686731
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Day 1-CORF Fall Meeting 2024
https://vimeo.com/event/4686731
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