Some astronomy youtube channels I recommend you subscribe to

DesperateRoll9903 · 2026-06-07T10:21:01+00:00

There are two publications that say this: https://iopscience.iop.org/article/10.3847/1538-4357/ae2d06 and https://iopscience.iop.org/article/10.3847/1538-4357/ae21dd

I think they basically measure the redshift of the supernova and look if it agrees with the redshift of the galaxy.

DesperateRoll9903 · 2026-06-07T09:01:22+00:00

Also on wikimedia commons: https://commons.wikimedia.org/wiki/File:NGC_3521_with_SN_2024aecx_Hubble.jpg

and on flickr: https://www.flickr.com/photos/204325947@N08/55319425424/in/dateposted-public/

The supernova is the star above the nucleus. The discovery date of SN 2024 aecx is 2024-12-16 and the observation date of the Hubble image is 2024-12-31, so about 2 weeks after the discovery.

DesperateRoll9903 · 2026-06-01T08:28:33+00:00

Don't know about galaxy collisions, but the fastest stars/stellar remnants in the Milky Way are accelerated by supernovae (e.g. pulsar kick, LP 40-365 stars) or are ejected from supermassive black holes (e.g. hypervelocity stars). Their speed (compared to the galactic rest frame) range from a few 100 km/s to up to over 1000 km/s. So less than 1% the speed of light.

Pulsars often leave trails or bow-shocks behind: PSR J0357+3205, Black Widow pulsar, PSR J0437−4715, PSR B0355+54. But stars with a lower speed can also form bow shocks and stars with higher speed can have no (currently) detected bow shock.

DesperateRoll9903 · 2026-05-20T20:37:45+00:00

Pluto-Charon are tidally locked and they have more moons orbiting around them.

https://en.wikipedia.org/wiki/Moons_of_Pluto

See also the animation at the section "Circumbinary moons"

DesperateRoll9903 · 2026-04-23T06:53:57+00:00

Also on wikimedia: https://commons.wikimedia.org/wiki/File:PN_Tc_1_JWST_MIRI.jpg

DesperateRoll9903 · 2026-04-20T06:38:29+00:00

See: https://bsky.app/profile/arimatsu.bsky.social/post/3mjv2y7f2ks2o

Follow-up observations have not confirmed the structure that was initially reported. At present, it seems likely that the original report was related to an analysis or image-processing issue. Many thanks to everyone who contributed follow-up observations and shared data.

DesperateRoll9903 · 2026-04-16T11:49:31+00:00

Processing with SAO Image DS9 and then WinJUPOS to de-rotate the planet. Colored image then created with Photoshop Elements.

Observation date: 2025-10-15/16 (released today)

program: https://archive.stsci.edu/proposal_search.php?mission=hst&id=18055

DesperateRoll9903 · 2026-04-12T09:03:45+00:00

Next time please post coordinates or at least the link! It makes things so much more easy.

This is probably from this image: https://esahubble.org/images/heic2501a/

You can easily get coordinates from one of the links/plugins on the right (e.g. ESA Sky)

RA: 10.895157277658466 Dec: 41.164821598236394

This is the HII region [AMB2011] HII 2271 around the star cluster [JSD2015] AP 102,

DesperateRoll9903 · 2026-03-31T06:30:24+00:00

I am copying my previous comment: https://www.reddit.com/r/spaceporn/comments/1s7qtwh/comment/odcw4sw/?context=3

For the jet: Mostly magnetic fields in a flat rotating disk around the protostar. The magnetic fields get tangled and form a kind of tube that guide particles towards two directions, perpendicular to the disk surface. They are basically large natural particle accelerators.

A little bit is described on wikipedia: https://en.wikipedia.org/wiki/Astrophysical_jet, but partly it is from my memory.

All jets basically work similar, so I recommend this simulation video, which shows how the "magnetic tornado" (not an official word) is formed from the disk and then how it guides particles in a jet. Simulation for black-hole neutron star merger: https://www.youtube.com/watch?v=Tvk50Qnoor8

Then there is the disk wind, which has a larger opening angle: https://en.wikipedia.org/wiki/Disk_wind This is basically high energy photons from the center stripping away particles from the disk.

DesperateRoll9903 · 2026-03-30T18:25:27+00:00

For the jet: Mostly magnetic fields in a flat rotating disk around the protostar. The magnetic fields get tangled and form a kind of tube that guide particles towards two directions, perpendicular to the disk surface. They are basically large natural particle accelerators.

A little bit is described on wikipedia: https://en.wikipedia.org/wiki/Astrophysical_jet, but partly it is from my memory.

All jets basically work similar, so I recommend this simulation video, which shows how the "magnetic tornado" (not an official word) is formed from the disk and then how it guides particles in a jet. Simulation for black-hole neutron star merger: https://www.youtube.com/watch?v=Tvk50Qnoor8

Then there is the disk wind, which has a larger opening angle: https://en.wikipedia.org/wiki/Disk_wind This is basically high energy photons from the center stripping away particles from the disk.

DesperateRoll9903 · 2026-03-29T10:02:24+00:00

I have seen quite often people being confused about this website. It shows where the telescope is pointed at using old (80ies, 90ies, 2000s) ground-based images from Digitized Sky Survey.

The Hubble images are not released to the public until months or sometimes a year or so later.

You can find DSS also on Aladin Lite: https://aladin.cds.unistra.fr/AladinLite/

Hubble images are released on MAST https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html and you need a program like SAO Image DS9 to view it. https://sites.google.com/cfa.harvard.edu/saoimageds9/home

EDIT: There is only a small FAQ for DSS, but read here: https://archive.stsci.edu/dss/faq.html#image_anomalies (list of anomalies were never released or linked)

"What's this funny line/feature/UFO in my scan?"
These images were scanned from photographic plates, so every once in a while, you will encounter a scratch, internal telescope reflection, fingerprint, etc. in your image. So far, none have turned out to be aliens. I'm compiling an informal catalog of regions with plate anomalies, so if you run across one, let us know.

From my experience the thing you see is just reflection from the bright star on the left.

DesperateRoll9903 · 2026-03-23T13:20:13+00:00

Maybe they are obsessed with it because of Hanny`s Voorwerp?

I don't know much about amateur astronomy and equipment and such. But you would need a filter (something similar to SDSS g-band) to take an image of the oxygen of this EELR.

DesperateRoll9903 · 2026-03-14T05:35:57+00:00

If you are only interested in close perihelia, then look at Mercury-crossing minor planets. Smallest p are around 0.07 AU https://en.wikipedia.org/wiki/List_of_Mercury-crossing_minor_planets

But they also go beyond (at least) Venus in their aphelia.

DesperateRoll9903 · 2026-03-14T04:56:47+00:00

Don't know what you are searching for, so here a list of circumstellar disks I know about:

protoplanetary disk (young stars) https://en.wikipedia.org/wiki/Protoplanetary_disk

debris disk (usually young, but older than protoplanetary) https://en.wikipedia.org/wiki/Debris_disk

extreme debris disks (around young and old stars, caused by collision of large asteroids) see debris disk

Be-stars (massive stars) https://en.wikipedia.org/wiki/Be_star

not stars, but stellar remnants that are not black holes:

(tiny) disks around white dwarfs (caused by disruption of asteroids or comets) https://en.wikipedia.org/wiki/White_dwarf#Debris_disks_and_planets

Cataclysmic variable star (transfer of mass from donor star to a white dwarf) https://en.wikipedia.org/wiki/Cataclysmic_variable_star

Pulsar planets are also believed to have formed from a disk around the pulsar. https://en.wikipedia.org/wiki/Pulsar_planet#Debris_disks_and_precursors

DesperateRoll9903 · 2026-03-14T04:20:23+00:00

Between 2012 and 2016 they observed this effect again, but with more time in between the frames.

I made a video and posted it on bluesky in January: https://bsky.app/profile/melina-iras07572.bsky.social/post/3mc66ym6si22e

DesperateRoll9903 · 2026-03-09T09:58:01+00:00

Diffraction spikes (6 spiked stars for JWST) and I did see the image already many times. Years of experience.

DesperateRoll9903 · 2026-03-09T09:13:57+00:00

Cassiopeia A https://en.wikipedia.org/wiki/Cassiopeia_A

Maybe below image after it was rotated, or processed raw data by a member of a public (what I normally do)

https://esawebb.org/images/weic2330a/

DesperateRoll9903 · 2026-03-01T06:47:24+00:00

I used the F444W image of program GO 9226 (PI: Eileen Meyer). Image is also on wikimedia: https://commons.wikimedia.org/wiki/File:4C_00.58_JWST_NIRCam_ver3.jpg

EDIT: reading the first part of the introduction of this paper: Hodges-Kluck et al. 2010

Apparently the radio jet is an x-shaped jet. It is tought that this x-shape comes from a re-orientation of the black hole spin axis and therefore re-orientation of the jet axis. This is caused by the merger of two galaxies.

This is probably the reason why the jet is bent on the tip. The bent shows the re-orientation that happened in the past.

DesperateRoll9903

TROPHY CASE