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#astrodon

44 posts41 participants3 posts today
Public
Universität Innsbruck

⭐ 💥 ⭐ Verschmelzende Sternhaufen: Forscher:innen konnten erstmals die Fusion von Sternhaufen in Zwerggalaxien beobachten. Es handelte sich dabei um einen Zufallsfund in Beobachtungen des #Hubble-Weltraumteleskops.

Mehr dazu in unserem Newsbeitrag oder dem dazugehörigen #Nature-Paper.

🆕 uibk.ac.at/de/newsroom/2025/hi

📖 nature.com/articles/s41586-025

In Computersimulationen wurde der Verschmelzungsprozess der Sternhaufen genau modelliert.
www.uibk.ac.atHimmlisches Schauspiel beobachtetMit den Hubble-Weltraumteleskop haben Wissenschaftler:innen erstmals verschmelzende Sternhaufen in der Kernregion von Zwerggalaxien direkt beobachtet. Das Team um Francine Marleau von der Universität Innsbruck berichtet darüber in der Fachzeitschrift Nature. Diese Entdeckung bestätigt die seit langem diskutierte Möglichkeit, dass die Zentren von Zwerggalaxien auf diesem Weg entstehen.
#Astrodon#Physik#Astrophysik
Public
franco_vazza

Do you know that this "simple" experiment has changed things forever in #physics ?

Super easy to replicate: a wire crossed by a current is a source of magnetic fields!

Danish physicists Hans Christian Oersted discovered that in 1820, than a few years later André-Marie Ampère gave a mathematical formulation to it (in what is now one of Maxwell's law).

Going to show this today to engineering students, hope they are fascinated as I still am about this.

#science#astrodon
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ArvitZ

Almost the Center of our Galaxy
-----------------------------------------------

I really wanted to get as close as possible to the milky way center as possible for my latitude.
This was as close to the horizon as possible before dawn.
It was worth the struggle of waking up at 3:30 AM at this remote location, because I got to test my new portable wide-angle setup for the first time :)

All details: app.astrobin.com/u/Kassar?i=8h

Astrophoto of the center region of our milky way
ALT
#astrophotography#astrodon#photography
Public
REBOUND Citation Bot

A new paper by Chachan et al. has cited REBOUND:
Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. V. Two Giant Planets in Kepler-511 but Only One Ran Away ui.adsabs.harvard.edu/abs/2025 #nbody #astrodon

ADS · Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. V. Two Giant Planets in Kepler-511 but Only One Ran AwaySystems hosting multiple giant planets are important laboratories for understanding planetary formation and migration processes. We present a nearly decade-long Doppler spectroscopy campaign from the HIRES instrument on the Keck-I telescope to characterize the two transiting giant planets orbiting Kepler-511 on orbits of 27 days and 297 days. The radial velocity measurements yield precise masses for both planets: <inline-formula> </inline-formula> (2.6σ) and <inline-formula> </inline-formula> (4σ) Jupiter masses, respectively. We use these masses to infer their bulk metallicities (i.e., metal mass fraction 0.87 ± 0.03 and 0.22 ± 0.04, respectively). Strikingly, both planets contain approximately 25–30 Earth masses of heavy elements but have very different amounts of hydrogen and helium. Envelope mass loss cannot account for this difference due to the relatively large orbital distance and mass of the inner planet. We conclude that the outer planet underwent runaway gas accretion while the inner planet did not. This bifurcation in accretion histories is likely a result of the accretion of gas with very different metallicities by the two planets or the late formation of the inner planet from a merger of sub-Neptunes. Kepler-511 uniquely demonstrates how giant planet formation can produce dramatically different outcomes even for planets in the same system.
Public
Universität Innsbruck

⭐ 💥 ⭐ Merging stars: For the first time, researchers have observed the fusion of star clusters in dwarf galaxies — a discovery made by chance through observations from the #Hubble space telescope.

Read more in our news article or check out the original study in #Nature:

🆕 uibk.ac.at/en/newsroom/2025/ce

📖 nature.com/articles/s41586-025

The merging process of the star clusters was precisely modeled in computer simulations.
www.uibk.ac.atCelestial spectacle witnessedA recent study reports the first direct observation of merging star clusters in the nuclear region of dwarf galaxies in Nature. The team was studying observations from the Hubble Space telescope, which were led by Francine Marleau from the University of Innsbruck. This detection confirms the feasibility of this formation route for nuclei in dwarf galaxies, which has long been debated.
#astrodon#physics#astrophysics
Public
Richard

Half of the universe's hydrogen gas, long unaccounted for, has been found

phys.org/news/2025-04-universe

"The cosmic microwave background is in the back of everything we see in the universe. It's the edge of the observable universe [...] So you can use that as a backlight to see where the gas is."

Phys.org · Half of the universe's hydrogen gas, long unaccounted for, has been foundBy Robert Sanders
#Astrodon#astronomy
Public
Cutterpillow

Behold the Pink Moon.

You’ll note, of course, that it’s not pink. “Pink” is just the name for the moon in April. This one I captured with the ASI678MC. The full disk fits pretty nicely with the Askar FRA400 + 678, though I do need to worry more about it drifting out of frame sooner.

Best 35% of 500 images, 2x drizzle, stacked & sharpened in PlanetarySystemStacker, edited in Affinity Photo (levels, curves, etc.).

The full “Pink Moon”. “Pink” does not describe the color, it is merely the name of the full moon for April. The moon is light and dark gray surrounded by a dark black background.
ALT
#astrophotography#space#pinkmoon
Public
ESO

Are you into fishing? The "fishing rods" in this image are a tad bigger than the ones you may be used to 😉 In this image of our Extremely Large Telescope, currently under construction in #Chile, huge cranes appear to be fishing for construction materials around the telescope.

Inside the dome is the telescope's main structure, which will eventually hold the telescope's mirrors, including its huge 39-m primary mirror.

Learn more about the ELT here: eso.org/public/images/potw2515

📷 ESO

A night image of a partially-built telescope under the stars. The image uses a distorted projection, which creates a focal point in the centre which is closer to the viewer, and which everything bends around. The middle of the picture is taken up by the dome building of the ELT, with a crane on the right that extends from the bottom right of the image, curving up to the middle of the image at the top. Its tether line splits the image in half horizontally. The dome of the ELT is open, showing the beams that hold the main structure in place, around it, are the beams that will make the doors once panelling is attached to it. Above the ELT on the left is the Milky Way, extending from the horizon about a third of the way up the image, meeting the top of the crane in top middle of the image. The Milky Way looks like a blue and purple wispy cloud, with points of white, the brighter stars.
ALT
#astrodon#astronomy#astrophotography
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