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RASC Calgary Centre
@calgaryrasc.bsky.social
Explore the sky, space and astronomy with the Calgary Centre of The Royal Astronomical Society of Canada!

Email us: inquiries@calgaryrasc.ca

calgary.rasc.ca
November 14, 2025 at 12:13 AM
Reposted by RASC Calgary Centre
Earlier this week the Aurora Borealis painted the sky with beautiful shades of green and red. The Earth was in the path of a powerful Coronal Mass Ejection and these high energy particles lit up the oxygen in our upper atmosphere. What an awesome natural display! Photos from south Calgary.
November 13, 2025 at 11:09 PM
Reposted by RASC Calgary Centre
There's nothing quite like being able to look up at the Aurora curtain
#aurora
November 13, 2025 at 4:50 PM
Reposted by RASC Calgary Centre
"Our findings show that ALAN disrupts the fundamental energetic constraints on ecosystem metabolism, warranting the inclusion of light pollution in global change and carbon–climate feedback assessments."

Johnston, Kim, & Harris. Nat. Clim. Chang. (2025). doi.org/10.1038/s415...
Widespread influence of artificial light at night on ecosystem metabolism - Nature Climate Change
The authors combine light intensity data with eddy covariance observations from 86 sites to show that artificial light at night increases ecosystem respiration and alters carbon exchange, with impacts...
doi.org
November 12, 2025 at 11:21 PM
Reposted by RASC Calgary Centre
Aurora before bedtime on a work night are the best Aurora 😜
November 12, 2025 at 4:51 PM
Not to be outdone by the reds of the aurora last night, this morning’s #sunrise is putting on a good show.
November 12, 2025 at 2:37 PM
Reposted by RASC Calgary Centre
Quick little time lapse of the aurora this evening!!!
November 12, 2025 at 3:19 AM
Reposted by RASC Calgary Centre
#Timelapse of lots of red #aurora looking east from northern Vulcan County. #astronomy
November 12, 2025 at 4:10 AM
Reposted by RASC Calgary Centre
#Timelapse of lots of red #aurora looking west from northern Vulcan County. Normally, this view would be dominated by the distant light dome from the City of Calgary’s #lightpollution. #astronomy
November 12, 2025 at 4:20 AM
Reposted by RASC Calgary Centre
A few more photos from tonight’s incredible #aurora. I’m fascinated by the amount of red light tonight. This is generated by oxygen molecules being excited by light plasma at least 600 km above the Earth. The green is also oxygen molecules, but much lower (100-250km). Definitely a great night.
November 12, 2025 at 4:23 AM
Reposted by RASC Calgary Centre
I’ve seen this shared several times with the header and footer not visible, so you can’t see the artists’s name.

Credit: Leo the Alien — alienyrox on redbubble and other platforms.
November 12, 2025 at 5:00 AM
Reposted by RASC Calgary Centre
I haven't yelled that many (overwhelmingly excited) swear words at the sky for a long time. WWOOOOOWWWWW. Reddest auroras I've ever seen!! Usually it takes a long time exposure/CCD camera to see red at all. This is BRIGHT!! You can actually see easily outside […]

[Original post on mastodon.social]
November 12, 2025 at 1:28 AM
#Timelapse of lots of red #aurora looking west from northern Vulcan County. Normally, this view would be dominated by the distant light dome from the City of Calgary’s #lightpollution. #astronomy
November 12, 2025 at 4:20 AM
#Timelapse of lots of red #aurora looking east from northern Vulcan County. #astronomy
November 12, 2025 at 4:10 AM
Reposted by RASC Calgary Centre
Interstellar Comet 3I/ATLAS is visible through telescopes from the Northern Hemisphere. Low to the east in the early morning sky, close to Spica (Alpha Virginis). Latest info. 🔭 🧪 theskylive.com/c2025n1-info
Comet 3I/ATLAS: Complete Information & Live Data | TheSkyLive
3I/ATLAS: Complete and live astronomy data, visibility information, sky charts, graphs, and tools for sky-watchers at all levels.
theskylive.com
November 11, 2025 at 5:25 PM
Reposted by RASC Calgary Centre
That fuzzy dot at the center of the image is the interstellar comet 3I/ATLAS as captured from my backyard this morning. 🔭
November 11, 2025 at 5:15 PM
Reposted by RASC Calgary Centre
They shall grow not old,
as we that are left grow old:
Age shall not weary them,
nor the years condemn.
At the going down of the sun
And in the morning
We shall remember them.
November 11, 2025 at 3:12 PM
Reposted by RASC Calgary Centre
A geomagnetic storm will hit Earth Tuesday evening with a decent viewing of the auroras including in parts of Canada.
https://ow.ly/Vsnw50XpLu4
Parts of Canada could get treated to a northern lights show Tuesday - The Weather Network
A geomagnetic storm will hit Earth Tuesday evening with a decent viewing of the auroras including in parts of Canada
ow.ly
November 11, 2025 at 4:00 AM
Reposted by RASC Calgary Centre
108 is a barred spiral galaxy located about 46 Mly away in the constellation of Ursa Major.

It has been observed to have over 200 globular clusters in orbit about it. #astronomy
November 10, 2025 at 11:34 PM
Reposted by RASC Calgary Centre
🦇 ICYMI
We’ve updated our Bat Ambassador Guide for teachers, interpreters, and anyone sharing bat knowledge. It’s free and packed with outreach tips and Alberta bat info.
Link in comments!
November 10, 2025 at 6:51 PM
Reposted by RASC Calgary Centre
Oh baby! Sunset was crazy tonight from the balcony. #Calgary
November 10, 2025 at 12:17 AM
Reposted by RASC Calgary Centre
In between observing comets this morning I did manage to catch the Moon in its waning gibbous phase. 🔭
November 10, 2025 at 12:57 AM
Reposted by RASC Calgary Centre
📢Survey on perceptions of noise & light pollution + how we can reduce it to benefit wildlife.

How does it effect you? What would you change? What measures are effective?

PLAN-B Horizon project

🔗 app.onlinesurveys.jisc.ac.uk/s/salford/pl...

#LightPollution #NoisePollution #Biodiversity #Europe
November 6, 2025 at 4:58 PM