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#darksky

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Johan Clausen
#seawednesday from Grand Marais, #Minnesota, taken in July 2018.

Stayed in this little hidden pearl of a town, for a couple of nights, and on the last night just around #sunset, I went for a walk along the #coast, ending up at a small beach near the city, just as the sun had set. At the same time, the #Moon had decided to show up, giving me this amazing view.

#photography #landscape #coastline #evening #nightsky #sunset #darksky #canon #canon5dmarkiii #5dmarkiii
#5dmarkiii
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datum (n=1)

@kim_harding "Are satellites bad for the environment?"

Tthe article is right regarding light pollution and carbon cost of ascent, but fails to note Kessler Syndrome / Collisional Cascading, and doesn't say the minimum re-entry pollution.

Satellite re-entry pollution is more impactful than the mass alone would suggest because of (catalytic?) effects of metals in different atmospheric strata where otherwise there's very little of those elements.

"Measurements show that about 10% of the aerosol particles in the stratosphere contain aluminum and other metals that originated from the “burn-up” of satellites and rocket stages during reentry. [...] These measurements have broad implications for the stratosphere and higher altitudes.

The mass of lithium, aluminum, copper, and lead from the reentry of spacecraft was found to exceed the cosmic dust influx of those metals" [1]

[1] pnas.org/doi/10.1073/pnas.2313

Also excellent: earthsky.org/earth/space-vehic

re: pirg.org/edfund/articles/are-s

#satellites#satellite#reentry
Public
AllanICarswellObservatory
This beautiful image was taken by one of our 2024 Astronomers in Residence, Robin Metcalfe! You can find more images like it, as well as daily blog posts from our past astronomers on our Astronomer in Residence (AIR) blog!
Check out the AIR blog for more posts: https://www.yorku.ca/science/observatory/air/astronomer-in-residence-blog/

Apply to be an Astronomer in Residence here: https://www.yorku.ca/science/observatory/air/

#Telescope #Park #DarkSky #Toronto #ScienceOutreach #Physics #Astronomy #YorkUObservatory #AllanICarswellObservatory #KillarneyProvincialPark #Science #SpaceExploration #Astronomers #AstronomerInResidence #Research
#research
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Sonja Quick

Hauptziele des Europäisches Manifests zur #Lichtverschmutzung 2025
#darksky

1. Förderung rechtlicher und politischer Anerkennung von künstlichem Licht als Schadstoff.
2. Klare Zielsetzungen zur Reduzierung der Lichtverschmutzung.
3. Integration von Lichtverschmutzung in die Umweltüberwachung.
4. Monitoring von Lichtverschmutzung
5. Verringerung der Lichtverschmutzung für den Umweltschutz.
6. Beleuchtungsdaten öffentlich zugänglich machen

darksky.org/the-european-light

Public
Akkana Peck

Just finished watching the (#NewMexico state) Senate Conservation hearing where they were debating Senate Bill 34 - Outdoor Light Requirements & Exemptions.

They were in a hurry to get to the Senate floor session, so they cut debate short and voted to table the bill -- which means it's removed from consideration unless someone fights to bring it back.

Of the senators who spoke, it was clear most of them hadn't read the bill nor listened to the presenters. Argh.

#darksky#Astronomy#Government
Public
Bryan Duke

I hope this brightens your Monday. Over 22 years in this hobby, this is my biggest astrophotography project to date. The data for this took 3 months to gather. The editing took me almost a month. Here's my Horsehead and Flame!

Details:
Explore Scientific ED127 refractor
Hotech SCA flattener
SBIG STF-8300C
L-eXtreme Ha/OIII filter
Losmandy G11 mount
BoldMFG Pier
116.7 hours of data (700x 600second sub-exposures, divided among 2 panels)
Imaged from my Bortle 5 back yard
Captured in NINA
Processed in Siril, GraXpert, SetiAstro Suite, Photoshop & NXT

#astromomy#astrophotography#photography
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Sonja Quick

@bmu Ein kleiner, aber wichtiger Teilerfolg! Es freut uns, dass das Licht am SWE-Schornstein nun ausgeschaltet wurde. Das zeigt, dass unsere Bemühungen, die Lichtverschmutzung in Erkrath zu reduzieren, Wirkung zeigen. Gleichzeitig bleibt es unser Ziel, den Einsatz smarter Beleuchtungssysteme im öffentlichen Raum weiter voranzutreiben, um nachhaltige und umweltfreundliche Lösungen zu etablieren. #Erkrath #BmUErkrath #bmu #Lichtverschmutzung #PatenderNacht #lightpollution #darksky

Public
Florian Launette
I took this picture in Death Valley a few years ago now. It was next to Rhyolite, Nevada. I hope you'll like it ;-) Have a nice day.

How I took this photo ? Canon 5D Mark IV 20 mm Sigma Art 30' f2,8 Iso 4000 Manual Raw Tripod and my phone for the light.

J'ai pris cette photo dans la Vallée de la Mort il y a quelques années maintenant. C'était à côté de Rhyolite, Nevada. J'espère que vous l'aimerez ;-) Passez une bonne journée.

#landscape #landscapes #usa #deathvalley #photo #photography #usa #nightsky #sky #astronomy #astro #astrophotography #deathvalleynps #deathvalleynationalpark #milkyway #milkyway-chasers #milkyway-photography #family #darksky #art#digitalart #valleedelamort #etoile #etoiles #nuitetoilee #canon #canonphotography #canonphotographers #canonphoto #florianlaunette #nature #landschaft #naturlandschaft #südstern #stern #sternenhimmel
#sternenhimmel
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