Matthias Rauls
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dobsonaut.bsky.social
Matthias Rauls
@dobsonaut.bsky.social
140 followers 200 following 180 posts
Hobby astronomer who loves to share his inspiration
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dobsonaut.bsky.social
Matthias Rauls @dobsonaut.bsky.social · Aug 27
The star that expanded the universe was discovered by Edwin Hubble in 1923 with a 2.5m telescope. The Cepheid star V1 gave first prove that Andromeda is a galaxy outside our milkyway. Today, this #Astrophotography with my little #CelestronOrigin clearly shows this star in the gorgeous spiral of M31.
The contrasting spiral arms of a galaxy, with old stars in yellow, young and hot groups of stars in blue and some tiny specs of magenta for glowing hydrogen gas.
dobsonaut.bsky.social
Have you yet seen two lava fountains close to each other? Check this live cam from Kilauea:
www.youtube.com/live/BqmpkUd...
[V3cam] Kīlauea volcano, Hawaii (south Halemaʻumaʻu crater)
YouTube video by USGS
www.youtube.com
October 18, 2025 at 8:12 AM
Reposted by Matthias Rauls
mcnees.bsky.social
Happy 120th birthday, special relativity!

Albert Einstein introduced special relativity in the paper "On The Electrodynamics Of Moving Bodies," published in Annalen der Physik #OTD in 1905. 🧪 ⚛️ 🔭

Manuscript: onlinelibrary.wiley.com/doi/abs/10.1...
English: www.fourmilab.ch/etexts/einst...
A black and white photo of Albert Einstein, around age 25, sitting at a desk. He is a wearing a flannel suit and resting his right arm on the desk. Einstein is looking to the left of the photographer in this posed photo. The first paragraph of the paper, in German. Translated to English is reads: It is known that Maxwell's electrodynamics—as usually understood at the present time—when applied to moving bodies, leads to asymmetries which do not appear to be inherent in the phenomena. Take, for example, the reciprocal electrodynamic action of a magnet and a conductor. The observable phenomenon here depends only on the relative motion of the conductor and the magnet, whereas the customary view draws a sharp distinction between the two cases in which either the one or the other of these bodies is in motion. For if the magnet is in motion and the conductor at rest, there arises in the neighbourhood of the magnet an electric field with a certain definite energy, producing a current at the places where parts of the conductor are situated. But if the magnet is stationary and the conductor in motion, no electric field arises in the neighbourhood of the magnet...
September 26, 2025 at 6:17 PM
dobsonaut.bsky.social
Constellation Cygnus hides a marvel of galactic nebulae. The Eastern Veil Nebula is part of a much larger remnant of a supernova that exploded around 8,000 years ago. This #astrophotography was created as a mosaic of two images taken with my #CelestronOrigin, each with an exposure time of one hour.
Blue-white wisps of a galactic nebula against the backdrop of countless stars in the summer Milky Way. A close-up of the blue-white wisps of the Eastern Veil nebula against the backdrop of countless stars in the summer Milky Way.
September 20, 2025 at 8:44 AM
dobsonaut.bsky.social
"The star that changed the size of the universe" was discovered in 1923 by Hubble on a plate taken with the 2.5m Hooker telescope. This variable Cepheid star proved that Andromeda is a far away galaxy like our own. Today, #astrophotography with my little #CelestronOrigin can show this star clearly.
The yellowish tone of old stars in the center of the Andromeda galaxy contrasts with the blue from groups of hot young stars, dark dust lanes and a few small magenta blobs from ionized hydrogen clouds. The image was exposed for around 2 hours with a 6 inch Celestron Origin telescope. In the midst of a featureless star cloud in the Andromeda galaxy, a single star is highlghted. This variable "Cepheid" star was discovered in 1923 by Edwin Hubble on photographic plates with the 2.5m Hooker telescope on Mt. Wilson. Today, a 6 inch Celestron Origin Intelligent Home observatory can image that star quite easily.
September 16, 2025 at 8:18 AM
Reposted by Matthias Rauls
astropicdaily.bsky.social
Galaxies, Stars, and Dust

#astronomy#astrophotography#apod
This well-composed telescopic field of view covers over a Full Moon on the sky toward the high-flying constellation Pegasus. Of course the brighter stars show diffraction spikes, the commonly seen effect of internal supports in reflecting telescopes, and lie well within our own Milky Way galaxy. The faint but pervasive clouds of interstellar dust ride above the galactic plane and dimly reflect the Milky Way's starlight. Known as galactic cirrus or integrated flux nebulae they are associated with the Milky Way's molecular clouds. In fact, the diffuse cloud cataloged as MBM 54, less than a thousand light-years distant, fills the scene. The galaxy seemingly tangled in the dusty cloud is the striking spiral galaxy NGC 7497. It's some 60 million light-years away, though. Seen almost edge-on near the center of the field, NGC 7497's own spiral arms and dust lanes echo the colors of stars and dust in our own Milky Way.
August 28, 2025 at 5:31 AM
dobsonaut.bsky.social
The star that expanded the universe was discovered by Edwin Hubble in 1923 with a 2.5m telescope. The Cepheid star V1 gave first prove that Andromeda is a galaxy outside our milkyway. Today, this #Astrophotography with my little #CelestronOrigin clearly shows this star in the gorgeous spiral of M31.
The contrasting spiral arms of a galaxy, with old stars in yellow, young and hot groups of stars in blue and some tiny specs of magenta for glowing hydrogen gas.
August 27, 2025 at 9:43 AM
Reposted by Matthias Rauls
chadbourn.bsky.social
As an antidote to the constantly dreadful news, have some philosophical concepts:
35 Philosophical Concepts That Don't Exist in English (But Totally Should) 1-10: Concepts About Self & Identity • Ubuntu (Zulu/Xhosa) - "I am because we • Shinrin-yoku (Japanese) "Forest are"; the idea that our humanity is shaped bathing"; a meditative appreciation of nature. through community. • Lagom • Tatemae & Honne (Japanese) - The (Swedish) - Not too much, not too little - just the right amount. contrast between a person's public face • Kalpa (Sanskrit) - A cosmic unit of time; (tatemae) and their true feelings (honne). often used in Hindu and Buddhist • Janteloven (Scandinavian) - The cultural cosmology. belief that no one is better than anyone • Memento mori (Latin) - "Remember you else; humility over individualism. • Ikigai (Japanese) - Your reason for being; must die"; a reflection on mortality and the value of life. the intersection of passion, mission, $ 21-30: Emotions, Relationships & Human vocation, and profession. Nature • Duende (Spanish) - A mysterious, soul-stirring emotional • Kaukokaipuu (Finnish) - A longing for power, often distant places you've never been. experienced through art or music. • Kintsugi (Japanese) - The art of repairing * Jayus (Indonesian) - A joke so badly told that it becomes funny again. broken pottery with gold, symbolizing • Mamihlapinatapai (Yaghan) - The look beauty in imperfection and healing shared by two people who want to act • Zanshin (Japanese) - A state of relaxed but hesitate. alertness and focused awareness, • Forelsket (Norwegian) - The euphoria of especially in martial arts. falling in love. • Gezelligheid (Dutch) - The warm, collective comfort of being with loved • Humorebi (Japanese) - The sunlight that filters through the leaves of trees. ones. • Mokita (Kivila, Papua New Guinea) - The • Wabi-sabi (Japanese) - A worldview truth everyone knows but no one says. centered on accepting transience and • Ya'aburnee (Arabic) - Literally "you bury imperfect beauty. me"; a declaration that life without the • Sprezzat…
August 26, 2025 at 8:15 PM
dobsonaut.bsky.social
About 8,000 years ago, a star exploded in the constellation Cygnus. Today, we can observe the faint remnants of this supernova as the "Veil Nebula". This astrophotography was composed of two 1h exposures taken with my @celestronuniverse.bsky.social‬ Origin telescope and developed in #Pixinsight.
August 23, 2025 at 8:56 AM
dobsonaut.bsky.social
A few thousand years ago, the star at the center of the Dumbbell Nebula (Messier 27) ejected its outer gas envelope at the end of its life, which it now illuminates from within. This #astrophotography was exposed for one hour near full moon with my #CelestronOrigin and developed in Pixinsight.
A gas nebula glowing in intensive blue and red light in front of a star-spangled milkyway.
August 11, 2025 at 7:23 PM
dobsonaut.bsky.social
Two very different objects shine in this #astrophotography with my #CelestronOrigin. In Ring Nebula M57 in constellation Lyra, an ejected gas shell glows in the hard UV light of a 75000K hot dwarf star from 2300LY. The galaxy next to it (IC1296, 250Mio LY) is larger than our milkyway but very faint.
In front of a dark sky colorful stars shine together with the blueish-green-red gas remanants of a dying dwarf star. The scene is decorated with a tine spiral galaxy in the far distance.
June 15, 2025 at 5:06 PM
dobsonaut.bsky.social
😱
simongerman600.bsky.social Simon Kuestenmacher @simongerman600.bsky.social · Jun 14
In May 2025, fires broke out in Canada. The smoke covered US skies too. Following a warm, dry spring, high winds fueled wildfires that have grown to seven times the ten-year average. More than 200 fires have broken out, most of them started by (really dumb) humans. Source: buff.ly/uiYQrCf
June 15, 2025 at 7:42 AM
Reposted by Matthias Rauls
mpoessel.de
Heute gelernt: Die physikalischen Einheiten-Vorsätze kommen zum Teil aus dem Dänischen. Femten als dänisches Wort für 15 wurde zur Vorsilbe "Femto", wobei z.B. ein Femtometer 10 hoch minus 15 Meter sind. Analog bei atten, dänisches Wort für 18, ein Attometer sind 10 hoch minus 18 Meter.
June 12, 2025 at 11:51 AM
dobsonaut.bsky.social
The Iris Nebula (NGC7023) bears its name because gas clouds reflect the bluish light of very hot neighboring stars. It is surrounded by molecular dust clouds with embedded brownish carbon compounds. This #astrophotography with my Celestron Origin was exposed for 160min and developed in Pixinsight.
Gas clouds in the milky way are glowing in an intense blue which contrast with the brownish clours of surrounding molecular clouds.
May 31, 2025 at 6:45 PM
Reposted by Matthias Rauls
planetdr.bsky.social
The Presidents Budget Request for NASA is out. It’s a bloodbath

Canceled are DAVINCI, VERITAS, Juno, OSIRIS-APEX, US participation in ExoMars and EnVision…

Huge cut to R&A. No funding to begin development of the Uranus Orbiter.

If you’ve ever cared about NASA, time to contact congress.
May 30, 2025 at 8:30 PM
Reposted by Matthias Rauls
cplberry.bsky.social
Not good news for gravitational-wave or multimessenger astronomy "In FY 2026 NSF will operate only one of the two [LIGO] sites and will support a reduced level for technology development"

☄️⚛️🧪🔭
dangaristo.bsky.social Dan Garisto @dangaristo.bsky.social · May 30
Presidential budget is out. Here's NSF. Biggest cut, by amount, is $1 billion, or 66.8%, from MPS (Physics & Math directorate). nsf-gov-resources.nsf.gov/files/00-NSF...
MPS budget
May 30, 2025 at 10:04 PM
dobsonaut.bsky.social
Galaxy Messier 64 at a distance of 24Mio LY is also known as "Black-Eye Galaxy" because of its characteristically shaped dust band. This #astrophotography with my @celestronuniverse.bsky.social Origin telescope is based on an exposure time just under half an hour and was developed in #Pixinsight.
A galaxy with blueish spiral arms and a large dark dust band around its yellow-brownish core, dubbed the "Blach Exe Galaxy".
May 26, 2025 at 8:50 AM
Reposted by Matthias Rauls
klstone.bsky.social
Ich hab mir gedacht, ich erkläre heute mal diese Kurven, die ich fast jeden Tag in meiner Tagesübersicht als Tweet 3/5 mitschicke.

Abgesehen davon, dass sie sehr bunt sind, widerlegen sie nämlich einige weit verbreitete Vorurteile zum Stand der #Energiewende in Deutschland...

1/12
May 17, 2025 at 10:49 PM
dobsonaut.bsky.social
Galaxy M104 is also known as the “Sombrero Galaxy” because of its striking shape. With an exposure time of 140 minutes, this #astrophotography with my #Celestron #Origin shows numerous globular clusters in the galaxy's halo, structures in the dust disk and many faint galaxies in the background.
May 14, 2025 at 9:46 AM
Reposted by Matthias Rauls
apodunofficial.bsky.social
#apod 2025-05-07
Galaxy Wars: M81 versus M82
Image Credit:
Collaborative Astrophotography Team (CAT)

Web page: https://apod.nasa.gov/apod/ap250507.html
apod.1571698092.bin
May 7, 2025 at 6:30 AM
dobsonaut.bsky.social
The “Whirlpool Galaxy” M51, about 24Mio LY away, is subject to strong gravitational interactions with its companion galaxy. Countless stars are torn out of both galaxies and form extensive tidal tails. This #astrophotography image was made from 2.5h of data with my #Celestron #Origin in #Pixinsight.
Two interacting galaxies glow in the colors of young and hot blueish stars, the yellowish tone of old and mature stars and exhibit magenta colored blobs of of excited hydrogen atom nebulae.
April 26, 2025 at 4:49 PM
dobsonaut.bsky.social
Time for a late winter memory of my first deep sky object which I exposed for about 30 minutes with my #Celestron #Origin. The large Orion Nebula M42, birthplace for many new stars and planets, paints a fantastic landscape in the winter evening sky, where the eye can go for a walk. #astrophotography
M42 is a blue-red glowing emission nebula in the constellation orion, photographed with a Celestron Origin smart telescope.
April 24, 2025 at 6:18 PM
Reposted by Matthias Rauls
urmymuse.bsky.social
Galaxy NGC 2403 "Mini Triangulum". 8 million light years away ! Shot from light polluted skies of east Leeds over the last two weeks of March. 16hrs 47mins of data used. #Astrophotography #Astronomy
April 12, 2025 at 5:40 PM
dobsonaut.bsky.social
In Globular star cluster M3, around 500,000 stars are crowding within just 125 light years. This #astrophotography image taken with my #Celestron #Origin lets you recognize a mixture of old, red giant stars and “blue stragglers”, which were formed by mass exchange or even mergers between two stars.
Globular star cluster with Messier 3 with hundreds of thousands stars, 34,000 light years from earth. A close-up view of the globular cluster, where 500.000 stars are crowding within a shere of just 125 light yeras.
April 21, 2025 at 12:43 PM
Reposted by Matthias Rauls
eric-reinhart.com
The Trump regime is now using US Attorneys to intimidate academic journals by sending them letters demanding they explain how they ensure ‘viewpoint diversity.’ Journal editors should be public about this and coordinate to refuse to comply with these fascist tactics.
April 17, 2025 at 7:56 PM
dobsonaut.bsky.social
Star cluster NGC2244 formed only a few million years ago from the gas of the Rosette Nebula, which it now stimulates to glow from within with its radiation. 30min exposure with my #Celestron #Origin reveal a variety of nebula knots from which stars are still forming today. #astrophotography
A cluster of a few thousand stars imbedded in a colorful nebulosity in the constellation of Monoceros. Captured with the #Origin smart telescope by #Celestron.
April 17, 2025 at 9:02 AM