Vesna M-Zdjelar
@vesnamz.bsky.social
Astronomer, cosmologist, teach Astronomy, Physics of Music, Cosmology, Concepts in Science, textbook author, exploring astronomical navigation, https://en.wikipedia.org/wiki/Vesna_Milosevic-Zdjelar
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Vesna M-Zdjelar
@vesnamz.bsky.social
· Mar 21
Years ago, Sir Partick Stewart said into my camera: “Welcome to the class” for my students. I start every course with his greeting for 700 students a year. Some know him as my beloved Cptn Picard, some as Professor X……My expression here is priceless.
Reposted by Vesna M-Zdjelar
A rocky outcrop on Mars, photographed yesterday.
March 26, 2025 at 8:45 PM
A rocky outcrop on Mars, photographed yesterday.
Reposted by Vesna M-Zdjelar
Saturn, its ring system, and icy moon Tethys.
March 27, 2025 at 2:25 AM
Saturn, its ring system, and icy moon Tethys.
Reposted by Vesna M-Zdjelar
This is crescent Uranus, as seen by Voyager 2 after its flyby on 24 January 1986.
The Sun is to the left of this scene. This view is not possible from Earth, and has not been seen by humanity since 1986.
Credit: NASA/JPL-Caltech/USGS
The Sun is to the left of this scene. This view is not possible from Earth, and has not been seen by humanity since 1986.
Credit: NASA/JPL-Caltech/USGS
March 23, 2025 at 1:27 AM
This is crescent Uranus, as seen by Voyager 2 after its flyby on 24 January 1986.
The Sun is to the left of this scene. This view is not possible from Earth, and has not been seen by humanity since 1986.
Credit: NASA/JPL-Caltech/USGS
The Sun is to the left of this scene. This view is not possible from Earth, and has not been seen by humanity since 1986.
Credit: NASA/JPL-Caltech/USGS
Reposted by Vesna M-Zdjelar
Hey folks, check out our brand new survey and video on the attitudes of physicists to most controversial topics on black holes and fundamental physics. You will be shocked at what’s consensus, and what’s not!
What do physicists think about controversial topics, like interpretations of QM, fine-tuning, dark matter, dark energy, inflation, and quantum gravity? Join
@nafshordi.bsky.social and me as we reveal the results of a brand new survey of leading experts. www.youtube.com/watch?v=e7Rq...
@nafshordi.bsky.social and me as we reveal the results of a brand new survey of leading experts. www.youtube.com/watch?v=e7Rq...
Copenhagen survey on Fundamental Physics & Black Holes
YouTube video by Phil Halper (aka Skydivephil)
www.youtube.com
March 21, 2025 at 9:49 PM
Hey folks, check out our brand new survey and video on the attitudes of physicists to most controversial topics on black holes and fundamental physics. You will be shocked at what’s consensus, and what’s not!
Reposted by Vesna M-Zdjelar
fulfilling my obligation to repost at least one cat video in my life
March 21, 2025 at 3:31 PM
fulfilling my obligation to repost at least one cat video in my life
Reposted by Vesna M-Zdjelar
Cosmic Distance Calibration xkcd.com/3066
March 21, 2025 at 7:49 PM
Cosmic Distance Calibration xkcd.com/3066
Reposted by Vesna M-Zdjelar
Reposted by Vesna M-Zdjelar
Here is the actual DESI scientific paper, thanks to @todlauer.bsky.social.
data.desi.lbl.gov/public/paper...
data.desi.lbl.gov/public/paper...
data.desi.lbl.gov
March 19, 2025 at 10:18 PM
Here is the actual DESI scientific paper, thanks to @todlauer.bsky.social.
data.desi.lbl.gov/public/paper...
data.desi.lbl.gov/public/paper...
Reposted by Vesna M-Zdjelar
Okay I goofed and called this DESI rather than last week's DES result. But now @desisurvey.bsky.social has actually announced their results! See the press release here:
newscenter.lbl.gov/2025/03/19/n...
#physics #science ⚛️
newscenter.lbl.gov/2025/03/19/n...
#physics #science ⚛️
March 19, 2025 at 10:15 PM
Okay I goofed and called this DESI rather than last week's DES result. But now @desisurvey.bsky.social has actually announced their results! See the press release here:
newscenter.lbl.gov/2025/03/19/n...
#physics #science ⚛️
newscenter.lbl.gov/2025/03/19/n...
#physics #science ⚛️
Reposted by Vesna M-Zdjelar
This Day in #History 1937
Astronomer Fritz Zwicky publishes his research on stellar explosions, coining the term "supernova" and hypothesizing that they are the origin of cosmic rays.
Astronomer Fritz Zwicky publishes his research on stellar explosions, coining the term "supernova" and hypothesizing that they are the origin of cosmic rays.
March 19, 2025 at 9:40 PM
This Day in #History 1937
Astronomer Fritz Zwicky publishes his research on stellar explosions, coining the term "supernova" and hypothesizing that they are the origin of cosmic rays.
Astronomer Fritz Zwicky publishes his research on stellar explosions, coining the term "supernova" and hypothesizing that they are the origin of cosmic rays.
Reposted by Vesna M-Zdjelar
If the mounting evidence of weakening dark energy holds up, it would upend cosmologists’ understanding of our ultimate destiny. @walkingthedot.bsky.social reports:
March 19, 2025 at 10:00 PM
If the mounting evidence of weakening dark energy holds up, it would upend cosmologists’ understanding of our ultimate destiny. @walkingthedot.bsky.social reports:
Reposted by Vesna M-Zdjelar
Reposted by Vesna M-Zdjelar
The first batch of survey data from @esa.int's Euclid mission dropped earlier today.
This is a portion of the Deep Field Fornax, a focused look at the region of space in the Fornax constellation.
Based on the press release, I estimate that there are more than TWO MILLION galaxies in this image.
This is a portion of the Deep Field Fornax, a focused look at the region of space in the Fornax constellation.
Based on the press release, I estimate that there are more than TWO MILLION galaxies in this image.
March 19, 2025 at 11:14 PM
The first batch of survey data from @esa.int's Euclid mission dropped earlier today.
This is a portion of the Deep Field Fornax, a focused look at the region of space in the Fornax constellation.
Based on the press release, I estimate that there are more than TWO MILLION galaxies in this image.
This is a portion of the Deep Field Fornax, a focused look at the region of space in the Fornax constellation.
Based on the press release, I estimate that there are more than TWO MILLION galaxies in this image.
Reposted by Vesna M-Zdjelar
The images and other information released Wednesday by the European Space Agency’s Euclid observatory includes a preview of three cosmic areas that the mission will spy in finer detail, mapping the shapes and locations of galaxies billions of light years away.
Euclid space telescope unveils new images of galaxies billions of light years away
A European space telescope launched to explore the dark universe has released a trove of new data on distant galaxies.
www.pbs.org
March 19, 2025 at 9:38 PM
The images and other information released Wednesday by the European Space Agency’s Euclid observatory includes a preview of three cosmic areas that the mission will spy in finer detail, mapping the shapes and locations of galaxies billions of light years away.
Reposted by Vesna M-Zdjelar
#throwbackthursday to Murray Gell-Mann working in the triple office he shared with Daniel Z. Freedman and Sidney Coleman. #physics #aspen
March 20, 2025 at 9:43 PM
#throwbackthursday to Murray Gell-Mann working in the triple office he shared with Daniel Z. Freedman and Sidney Coleman. #physics #aspen
Years ago, Sir Partick Stewart said into my camera: “Welcome to the class” for my students. I start every course with his greeting for 700 students a year. Some know him as my beloved Cptn Picard, some as Professor X……My expression here is priceless.
March 21, 2025 at 3:12 AM
Years ago, Sir Partick Stewart said into my camera: “Welcome to the class” for my students. I start every course with his greeting for 700 students a year. Some know him as my beloved Cptn Picard, some as Professor X……My expression here is priceless.
Reposted by Vesna M-Zdjelar
It’s important to map out our universe! But dynamical dark energy remains wildly implausible. It’s a fanciful notion, requires fine tuning worse than a pencil on its tip, and yet more tuning for the sole purpose of hiding itself from observers for so long. I call it a unicorn in a duck suit here:
Is Dark Energy Getting Weaker? New Evidence Strengthens the Case. | Quanta Magazine
Last year, an enormous map of the cosmos hinted that the engine driving cosmic expansion might be sputtering. Now physicists are back with an even bigger map, and a stronger conclusion.
www.quantamagazine.org
March 19, 2025 at 11:34 PM
It’s important to map out our universe! But dynamical dark energy remains wildly implausible. It’s a fanciful notion, requires fine tuning worse than a pencil on its tip, and yet more tuning for the sole purpose of hiding itself from observers for so long. I call it a unicorn in a duck suit here:
Reposted by Vesna M-Zdjelar
The DESI survey @desisurvey.bsky.social suggests the universe is *not* maximally boring! Statistical significance is not quite there yet, but a new result is a bit stronger than their previous indication that dark energy might be varying with time. (cont.)
arxiv.org/abs/2503.06712
arxiv.org/abs/2503.06712
Dark Energy Survey: implications for cosmological expansion models from the final DES Baryon Acoustic Oscillation and Supernova data
The Dark Energy Survey (DES) recently released the final results of its two principal probes of the expansion history: Type Ia Supernovae (SNe) and Baryonic Acoustic Oscillations (BAO). In this paper,...
arxiv.org
March 19, 2025 at 9:37 PM
The DESI survey @desisurvey.bsky.social suggests the universe is *not* maximally boring! Statistical significance is not quite there yet, but a new result is a bit stronger than their previous indication that dark energy might be varying with time. (cont.)
arxiv.org/abs/2503.06712
arxiv.org/abs/2503.06712