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#physics

66 posts39 participants25 posts today
Replied in thread
grobi

2025 July 13

Planetary Nebula Mz3: The Ant Nebula
* Image Credit: NASA, ESA, R. Sahai (JPL) et al., Hubble Heritage Team
nasa.gov/
esa.int/https://science.jpl.na
jpl.nasa.gov/

Explanation:
Why isn't this ant a big sphere? Planetary nebula Mz3 is being cast off by a star similar to our Sun that is, surely, round. Why then would the gas that is streaming away create an ant-shaped nebula that is distinctly not round? Clues might include the high 1000-kilometer per second speed of the expelled gas, the light-year long length of the structure, and the magnetism of the star featured here at the nebula's center. One possible answer is that Mz3 is hiding a second, dimmer star that orbits close in to the bright star. A competing hypothesis holds that the central star's own spin and magnetic field are channeling the gas. Since the central star appears to be so similar to our own Sun, astronomers hope that increased understanding of the history of this giant space ant can provide useful insight into the likely future of our own Sun and Earth.
esahubble.org/news/heic0101/
science.nasa.gov/asset/hubble/
en.wikipedia.org/wiki/Mz_3

ui.adsabs.harvard.edu/abs/2004
apod.nasa.gov/apod/ap971106.ht

apod.nasa.gov/apod/ap250713.ht

#space#earth#nebula
Paul E.

TIL about the super cool phenomenon of supercooled freeze pop popsicles when my son took one out of the freezer in a still liquid form and we watched it crystalize after he squeezed it. Physics is amazing!

#science#physics
Steve's Place

It's "bullshit."

This is what you miss out on by not taking college courses. Cursing lecturers. Also, ones who write inordinately long proofs and then get lost in them, so they dismiss the class to try to figure out where life went wrong for them. This actually happened in a community college algebra class for a very simple concept, which the lecturer had a very long and inelegant proof of.

youtube.com/watch?v=f_Hv0APV0S8

YouTubeThis Experiment Just Ruled Out The Many Worlds Theory, Physicists ClaimBy Sabine Hossenfelder
#science#physics
AllanICarswellObservatory
Happy Space Science Saturday! Did you know that today Saturn begins its retrograde motion? Normally, Saturn moves eastward against the background of stars, but during retrograde it appears to pivot and move westward through the constellations. This apparent backward motion isn’t because Saturn actually reverses its orbit, but rather because of Earth’s own motion around the Sun. As Earth passes Saturn in its orbit, our changing perspective makes Saturn appear to move backward in the night sky.


#Orbit #Retrograde #Saturn #SpaceExploration #Space #Astronomer #Astronomy #SpaceScienceSaturday #YorkU #Observatory #AllanICarswellObservatory #Stargazing #YorkUniverse #Telescope #Planets #Stars #Science #Physics #Toronto #YorkUObservatory #AICO #Cosmos #LearnAstronomy #SpaceFacts
#spacefacts
Assoc for Scottish Literature

Cosmic ceilidh

Hundreds of scientists are set to perform a new Scottish country dance inspired by the ripples in spacetime whose existence was first theorised by Albert Einstein.

Researchers from the University of Glasgow teamed up with the culture and research organisation Science Ceilidh to develop a dance to mark the 10th anniversary of the historic first detection of gravitational waves.

gla.ac.uk/news/headline_119503

www.gla.ac.ukCosmic ceilidh dance set to celebrate historic science discoveryResearchers from the University of Glasgow teamed up with the culture and research organisation Science Ceilidh to develop a dance to mark the 10th anniversary of the historic first detection of gravitational waves.
#Scottish#culture#dance
Zorro

If they make a chip for this then a shout-out to Blake's 7 and the writer, Terry Nation, for predicting this with Tariel-cells.

Orac, the greatest computer ever (fictional or not), would come later and be able to wirelessly access any PC with a Tariel cell in it.

Which was all of them.

As well as being incredibly powerful, Orac was also an irascible and arrogant AI.

europesays.com/uk/258573/ Quantum material could make all electronics 1,000 times faster #Physics #Science #UK #UnitedKingdom #Blakes7 #TerryNation

Archivist Liz

This blog has been a very long time in the making. Last summer I visited the Niels Bohr Library and Archives of the American Institute of Physics. That visit turned into an interview (Allison Rein interviewed me). Very excited to share this. I hope it will help a few more people find their way to our catalogue as well! aip.org/library/ex-libris-univ #arhives #digipres #historyofscience #physics #nuclearphysics

E0040_011.jpg
AIP · Inside the International Atomic Energy Agency Archives UnitAn Interview with Archivist, Elizabeth Kata
j_bertolotti

#PhysicsFactlet
Finding the roots of a function is a very common problem in computational Physics, and the bisection method is a simple and effective (albeit far from optimal) way to do that.
The idea is that you start by "bracketing" your root between a value of x where the function is negative and one where it is positive. You then take the midpoint between them, check if your function there is positive or negative and update the bracket.

#Physics#Computing#Algorithm
Continued thread
grobi

Noctilucent Clouds explained

Noctilucent Clouds (NLCs) are Earth's highest clouds, that float at the edge of space more than 82 km (50 miles) above the planet's surface. When viewed from space, the same atmospheric phenomenon is referred to as polar mesospheric clouds (PMCs). Noctilucent clouds appear during summer and are probably composed of tiny ice crystals and specks of meteor dust.

Noctilucent or night-shining clouds are rare, high-altitude clouds that glow with a blue silvery hue at dusk or dawn when the Sun shines on them from below the horizon. These ice clouds typically occur near the North and South Poles but are increasingly being reported at mid- and low latitudes. Observing them helps scientists better understand how human activities may affect our atmosphere.

Credits:
Science @ NASA science.nasa.gov
Semen Sh. - NLC 2015.06.23 Timelapse 4K
Noctilucent cloud (серебристые облака) over Bryansk, RU
SciNews

** Note by grobi:
"To upload this video, I converted it and compressed it to a smaller file-size under linux with the free software ffmpeg and the corresponding command:

'ffmpeg -i video_in.mkv -vcodec libx265 -crf 28 video_out.mp4'

Maybe you would like to post a corresponding video on a scientifically related topic, but it is perhaps too big? Then try ffmpeg."

#space#earth#atmosphere
Replied in thread
grobi

2024 September 18
A starfield is shown with a long blue-glowing nebula taking up much of the frame. The nebula appears, to some, similar to a fish or a mermaid.

The Mermaid Nebula Supernova Remnant
* Image Credit & Copyright: Neil Corke; Text: Natalia Lewandowska (SUNY Oswego)
app.astrobin.com/u/NeilCorke#g
ww1.oswego.edu/physics/profile
ww1.oswego.edu/physics/

Explanation:
New stars are born from the remnants of dead stars. The gaseous remnant of the gravitational collapse and subsequent death of a very massive star in our Milky Way created the G296.5+10.0 supernova remnant, of which the featured Mermaid Nebula is part. Also known as the Betta Fish Nebula, the Mermaid Nebula makes up part of an unusual subclass of supernova remnants that are two-sided and nearly circular. Originally discovered in X-rays, the filamentary nebula is a frequently studied source also in radio and gamma-ray light. The blue color visible here originates from doubly ionized oxygen (OIII), while the deep red is emitted by hydrogen gas. The nebula's mermaid-like shape has proven to be useful for measurements of the interstellar magnetic field.

apod.nasa.gov/apod/ap240918.ht

#space#nebula#astrophotography
Nicole Sharp

Glimpses of Coronal Rain

Despite its incredible heat, our sun‘s corona is so faint compared to the rest of the star that we can rarely make it out except during a total solar eclipse. But a new adaptive optic technique has given us coronal images with unprecedented detail.

These images come from the 1.6-meter Goode Solar Telescope at Big Bear Solar Observatory, and they required some 2,200 adjustments to the instrument’s mirror every second to counter atmospheric distortions that would otherwise blur the images. With the new technique, the team was able to sharpen their resolution from 1,000 kilometers all the way down to 63 kilometers, revealing heretofore unseen details of plasma from solar prominences dancing in the sun’s magnetic field and cooling plasma falling as coronal rain.

The team hope to upgrade the 4-meter Daniel K. Inouye Solar Telescope with the technology next, which will enable even finer imagery. (Image credit: Schmidt et al./NJIT/NSO/AURA/NSF; research credit: D. Schmidt et al.; via Gizmodo)

#flowVisualization#fluidDynamics#magneticField
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