A Triply Glowing Night Sky over Iceland
Credit & Copyright: Wioleta Gorecka; Text: Natalia Lewandowska (SUNY Oswego)
apod.nasa.gov/apod/ap230815.ht… #APOD
APOD: 2023 August 15 – A Triply Glowing Night Sky over Iceland
A different astronomy and space science related image is featured each day, along with a brief explanation.apod.nasa.gov
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Hey, I host a lemmy instance focused on books and reading (and all the communities that fall under that umbrella)
I don't think this was posted here already, but this instance has been up and running for a bit. Apologies if this isn't the best place for it, feel free to remove if need be! The instance has been running for a few weeks now and has a few users already, but if there's people invested in that specific niche interest that wants to spread the load across instances it exists. It has some extra lemmy front end UIs available, and I am building up the local communities as I have time to.
Some policy stuff as to how it operates, for sake of transparency.
Although I am currently the "only admin" I do have a "break glass" admin account and will be giving it to a trusted point person just in case (life happens sometimes...) as well as scaling up the team as need be.
If the instance ever has to go down, at the very least a 30 day notice will be given in advance as well as an outlined explanation as to why and a good faith effort will be made to keep it up as well.
The de-federation policy might be slightly controversial, and I completely understand. It is currently temporarily defederated from lemmys pornographic instances, mainly because of just how much it spams c/all. I will refederate in time when there more granular federation options, but I just can't reasonably moderate that right now. I also do defederate from the "worst of the worst" fediverse instances (ie, known CP hosts, far right, nazis, etc) as a precaution despite how janky cross federation is for lemmy right now, hence why the instance blocklist is long.
The instance currently uses object storage, and I post monthly financial statements as to what the cost of the resources for it are.
I also use a community seeder bot that runs every 12 hours to diversify content in all. The local communities focus are mainly book related, but it federates with most other instances.
I also am currently taking manual secure database backups at least weekly and storing them remotely, but I will be automating that process as soon as I can. I value security greatly.
The link is literature.cafe
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Heir_Of_Isildur, bonegakrejg, porkchop, anolemmi, parallax, blackluster117, fat_flying_pigs, mysteriouswineglass, zoats, t҉̠̙ǵ̣̞̄ͪ͜x̸̱͚̳ͫ͐̑̈ͯͣ̚n̒͌҉͉̦̜̝ͅ, papaya, stonemilker, can, flameguy21, Gruntyfish, StandingCat, ocassionallyaduck, BitSound, django, kr0n, CrinterScaked, spiderman, calm.like.a.bomb, sneakyninjapants, Shakuni, moreeni, i_agree, ElectricAirship, 𝙚𝙧𝙧𝙚, pkulak, mnemonicmonkeys, narp, Sliwa, UlfKirsten, cwagner, Anosyn, ArcticDagger, Jasdemi, repeatsitself, whysofurious, PoliticalAgitator, Ken Oh, Hrvatskii, Ichimander, Cycadophyta, H4mi, Gurfaild, Dochyo, dillydogg, normal_user, shadshack, Bady, TurtleJoe, SturgiesYrFase, MissingMongoose, zedgeist, dan80, TeryVeneno, donRodolfo, 8orange8, clucking_sliver, LolaCat, johannes, andruid and axsyse like this.
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I took a quick peak and I created an account too.
I don't see too many communities for individual series, except for Harry Potter. I can think of a few that I know I'd like:
Lord of the Rings
Wheele of Time
GameofThrones
The storm light archive
Mistborn
Cosmere
Cremposting - this is a shit posting sub of the above three
TheExpanse
Yeah, I'm pretty basic.
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Filtered word: nsfw
Disclaimer: fairly uninformed opinion. I don't know the inner workings of lemmy nor am I a legal expert.
Re: NSFW defederation. I remember reading somewhere around here about an instance that defederates from nsfw instances because of concerns over illegal content. That feels plausible, and being unintentionally in the middle of it feels risky. Something to consider.
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You aren’t hosting any of the images from federated instances
Images sometimes cache and create a copy locally. Sometimes they don't. I don't actually know when or under what conditions they cache.
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The extent of my moderation experience has been a few old phpbb forums and a few admittedly large Facebook groups. Let me think it over and I’ll get back to you shortly.
I also wonder if it might benefit from ebooks being separate because authors could post updates about them as theoretically as well as it’d be easier to manage spam.
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#ClimateDiary
This moss survived 165 million years — and now it's under threat from climate change
Ancient plant survived the formation of the Himalayas, but might now be facing extinction.Coleman, Jude
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Moon Meets Jupiter
Credit & Copyright: Jordi L. Coy
apod.nasa.gov/apod/ap230808.ht… #APOD
APOD: 2023 August 8 – Moon Meets Jupiter
A different astronomy and space science related image is featured each day, along with a brief explanation.apod.nasa.gov
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Hu! Funny thing!
Those Jupiter moons are all named after locations of The Expanse!
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[Image description: the 1955 Huffy Radiobike, a red coaster-style bike with cream and chrome accents. A radio with a speaker and volume and tuner dials is incorporated into the curvy frame, below the top tube. There is a battery pack on the rear rack.] #Alt4You
More information and pictures: onlinebicyclemuseum.co.uk/1955…
Light Pollution from Skyglow Changes Bird Behavior
Animals evolved for millions of years to live under naturally dark skies. But in the last few decades, humanity has directed more and more lighting into the sky, creating light pollution that has been proven to confuse many animal species. A new study looked at the behavior of birds that feed at dawn and dusk and the impact of light pollution on their behavior. The researchers found that the effect is complicated, with skyglow creating brighter conditions under overcast skies compared to regions without light pollution, and changed the birds' choices for when to fly.
sciencedirect.com/science/arti…
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Are you one of the 100,000? 🙋
@NASAArset provides trainings in multiple languages to help people around the world learn to use Earth observations! #OpenScience
[Video embedded in original tweet]
#NASAEarth
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Welcome to the fediverse BBC!
@BBCRD
@BBC5Live
@BBCRadio4
@BBCTaster
@Connected_Studio
@BBC_News_Labs
bbc.co.uk/rd/blog/2023-07-mast…
The BBC on Mastodon: experimenting with distributed and decentralised social media
Trialling ActivityPub and the federated model for social media and it's possibilities for the BBC.BBC R&D
This comes in at exactly the right time for our webinar on the fediverse for Canadian media, tonight 31 Jul 2023 at 7PM ET/4PM PT.
It's free, we're not selling anything, and we'd love to have media and civil society people present.
Federated Social Media for Canada
Join Evan Prodromou as he describes the ActivityPub standard, the fediverse landscape today, and how Canadian news, civil society, and all levels of government might connect with social media that can be owned and be interoperable, rather than use pr…lu.ma
Grab a File
Grab a file. Documentary ''Earth'' Part 3. Green
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I may have found an alternative solution to my blog's commenting system! 😺
The synchronization of comments from my Mastodon account. It's something I tried and abandoned, but I'm giving it another try after reading your comments. Well, I explain more on the blog and also share the source code:
Blog post, source code, and demo:
→ davidrevoy.com/article981/i-ma…
Bonus: Because I'm happy, here's a happy Mastodon mascot as a postman that I painted this morning.
#blog #selfhosting #php
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great I had it setup on one of my blog, with a bridge, you could copy not just replies but also favorites to your blog.
See a quick example on my site (integrated via JavaScript): marisa.club/a-new-adventure/
A new adventure on static site generation
A post on setting up the Zola static content generator for my personal site.marisa.club
I feel like Lemmy or Kbin would make more sense for this but I guess ActivityPub makes it irrelevant since they can interact anyway
Excellent idea!
@jherazob I tried to answer from my Lemmy account (a bit abandoned), and I can't. But it's quite possible that I'm not going about it the right way.
Cool that you managed to get this to work!
I think the authentication token is also necessary for mastodon instances that have authorized fetch enabled, because the point of that is to ensure randos don't just get to have info without the server being sure said rando isn't trying to block evade or whatever, but not 100% sure.
J'espère que l'on aura, à terme, plus d'implémentation activityPub depuis les sites de blog (je crois que WordPress le propose depuis peu) pour que le post avec un lien vers le billet de blog puisse être directement le contenu du blog. Ce serait génial d'arriver jusque là !
It's nice to see another implementation of blog comments using the Mastodon "context" API. 😀 I use it for fietkau.blog in a similar way. I additionally filter the replies by visibility and only show the ones set to "public".
If you'd like to read more about how to render custom emoji and other details, I recommend @cassidy's blog post about his implementation: cassidyjames.com/blog/fedivers…
Julian’s Blog
This is my place for long-form writing on technology, academia, games, and whatever else I may be thinking about.Julian Fietkau
Thanks!
An improvement idea: A JavaScript "Copy" button to copy the post's URL. Or copy it as an on-click event on the link's text.
Instructions: w3schools.com/howto/howto_js_c…
How To Copy to Clipboard
W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.www.w3schools.com
@yoyunix Thanks. To be fair, I doubt it will last long. Accidents of instance can happen, losing all comments, or the service might also go sunset and be replaced by a new tech more lightweight in the future. Maybe the API will change too with the new versions, up to a point it's too hard to follow for my low skill.
Right now my system on the blog has a cache of 1h for the post of the week, 4h for the post of the month, and 12h after that. Let see in 5 years if If Mastodon IDs are stable 😉
Great. I was gonna suggest that adding activitypub replies to the post was best till you said you'd already tried it.
Glad you've found a way that works.
@utopify_org Hey, Good question. I thought a lot about this. It's because of five good reasons:
1. Bandwidth (with many visitors, hot-linking them to all instance all the time is pretty heavy)
2. Privacy. Hotlinking them would give also log to instance owners of who connect to my website.
3. Loading speed: waiting for all servers to get pictures.
4. Copyright, and/or trolling possibly with p0rn or gore.
5. Aesthetic: I love the cat avatars peppercarrot.com/extras/html/2… 🙂
wow, okay, a lot of stuff I wouldn't even thought of until I would run into it.
Thanks for the explanation.
This is awesome! 👏🤓
Given you said spam was a problem with the previous commenting system, does this mean you consider Mastodon to be reasonably free from spam?
I sort of live in fear that Mastodon might suffer an influx of bots. Especially given it's decentralised, so presumably any instance could contribute unless your instance admin defederates from them.
I received insult, p0rn, spam, but very rarely, and it was removed after a simple click on the three dots and reporting them. Actually, I wish this post will attract one or two post of this type. I'm curious if the API would list the message if I block an account.
see also mastodon.blaede.family/@cassid…
I’ve promised enough people this, so I had to do it! 😁Here’s my write-up of how I added client-side Fediverse-powered comments to my Jekyll blog using the Mastodon API.
Huge props to @jwildeboer for the initial inspiration, as well as @julian and everyone who provided feedback for inspiring the design improvements.
cassidyjames.com/blog/fedivers…
✨💬 Reply to this thread then check the blog post comments to see it in action!
#Mastodon #Jekyll #WebDevelopment #ActivityPub #design
Toot toot! Mastodon-powered Blog Comments
The Fediverse—and Mastodon’s API—is magic for static Jekyll sitesCassidy James Blaede
En passant, je suis ravi que tu aies trouvé un autre moyen de rester au courant des opinions de tes lecteurs.
@raghukamath Hey, yes. The listing on the blog is just a copy of the Mastodon API, so every edit or removal should be reflected on the blog as soon as the blog updates.
The only thing to keep is a cache of maximum 24h so it is always removing or applying the edit into the due 24h legal date.
I'm planning to add soon an 'emergency refresh' button (just an action that force a cache update for the current article. It might be convenient in case of a very nasty comment. 😺
aren't the old comments re-federated? There might be a chance you can still get them back. Except those made by people in the instance that had the problem, I would guess the others should federate again.
Or maybe there is an issue with that as the initial post you made is lost? (So all comments along with it have no real reference).
I'll try to update a tiny bit the display part of the code this afternoon/evening (on the same page) : I had feedback on how to improve security and also I found aesthetic improvements for situations I met on the way (eg. differentiate video/image/other in attachment, or removing direct/private message from the listing with the token).
David Revoy / MastoComBlog · GitLab
A Php script that fetch and displays the comments received from the Fediverse. It requires a Mastodon account and posting on it to get the post ID.GitLab
@remram44
These bold explorers (or, not so bold, no judgment) will go where humans can't to explore real exoplanets. Check them out and take our quiz to see which Exoplaneteer YOU are: exoplanets.nasa.gov/exoplanete…
#NASAExoplanets
The Exoplaneteers | Explore – Exoplanet Exploration: Planets Beyond our Solar System
Four brave explorers, the Captain, the Brain, the Scout, and the Friend, find themselves flung onto different exoplanets. Separated by space, the Exoplaneteers search for signs of life, or friends, while facing the dangers of these strange worlds.Exoplanet Exploration: Planets Beyond our Solar System
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A fusion rocket designed to travel 500,000 mph is under construction
British startup Puslar Fusion is developing a fusion rocket it says will travel 500,000 mph, expanding our reach throughout the solar system.Kristin Houser (Freethink Media)
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Grab a File
Grab a file. Documentary ''Earth'' Part 1. Inferno.
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Applications for the #BlueBookTraineeship starting in March 2024 are now open!
Want to take your career to the next level? We have your desk ready and waiting for you!
✔ Open to all #university graduates of at least 3 years of study.
✔ No prior work experience in excess of 6 weeks in any #EU institution.
✔ No age limit to participate.
Apply by 31 August!
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Grab a File
send.trom.tf/r/uuKaYfytaB#NqeB…
#documentary
#file
#mkv
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How can astronomers know exactly how hot stars are? You can guess from their colors, but to get a precise measurement, you have to look at their spectra.
We spread out the light from the stars into a rainbow-like spectrum and look for patterns of lines, made by different elements and molecules in the star's outer layers. The presence or absence of lines tells you the precise temperature.
1/
Download video: webbtelescope.org/contents/med…
#astronomy #Astro101 #stars
Here are some actual stellar spectra, arranged by temperature. The hottest stars are at the top, coolest stars are at the bottom. The letters on the left are “spectral types,” a classification of stars based on their spectra.
Note how certain lines appear and then fade out as we go down in temperature. Most of the lines are caused by single elements. At the very bottom, we start to see bands of lines. Those are from molecules in the outer layers of stars.
2/
Image from: noirlab.edu/public/images/noao…
Why do we see lines? We will have to get into a little atomic physics.
As starlight shines through the outer layers of the star, the gas there will absorb photons that have exactly enough energy to bump their atoms’ electrons up to higher energy levels. The energy levels are different for each type of atom.
Since there are fewer photons at certain wavelengths that leave the star, we see narrow, dark lines.
3/
Learn more: webbtelescope.org/contents/art…
Very interesting and well explained!
This is also interesting in the context of #astrophotography where we are capturing the light emitted by the inverse phenomena in emission nebulae (explained in the linked article).
Is there a standard nomenclature for these absorption/emission lines, e.g. alpha & beta for hydrogen vs iii in Oiii for Oxygen emissions? Does it correspond to the number of energy level changes the electrons undergo?
There is a system, it is confusing.
Hydrogen lines get their own names.
At visible wavelengths, the Balmer series is the most important (Hα, Hβ, Hδ, etc.)
At UV wavelengths, the Lyman series is important (Lyα, Lyβ, Lyδ, etc.)
And at IR wavelength the Paschen series is important (Paα, Paβ, Paδ, etc.)
en.wikipedia.org/wiki/Hydrogen…
1/
Most other elements are designated by their ionization state and wavelength in angstroms. For example: HeII 4686
He I = neutral helium
He II = singly-ionized helium
He III = doubly-ionized helium
2/
Some lines are known as forbidden lines. These are normally disallowed, by the rules of quantum mechanics, but can be quite common in the very sparse gas found in astronomical objects, like nebulas. en.wikipedia.org/wiki/Forbidde…
These are designated by brackets. One common forbidden line is the oxygen doublet [OIII] 4959 and [OIII] 5007
3/
Except for the forbidden lines (which are only emission lines), these names are used for both absorption and emission lines.
4/
Follow-up question:
In the different emission nebulae images taken with the NIRCam instrument (like webbtelescope.org/contents/med…), what emission lines are captured?
Do the hydrogen an other atoms also emit in infrared?
Looking up the Balmer series on Wikipedia, the hydrogen emission lines start in the visible (red) and extend into UV but not in IR.
SpaceLifeForm
in reply to (moving) APOD • • •Edit and fix the alt-text.
The aurora is on the left.
Eduard
in reply to (moving) APOD • • •January Handl
in reply to (moving) APOD • • •やぎ
in reply to (moving) APOD • • •The Northern Lights shining in the night sky, and the colours reflected in the red-burning sky and lake, This is the beauty of Iceland🤩
I was awestruck by the wonders of nature
夜空に輝くオーロラ、そして赤々と燃える空と湖面に映る色彩、これぞ美しきアイスランドですね🤩
わたしは自然の驚異に見惚れました
写真の共有に感謝します🙏... show more
The Northern Lights shining in the night sky, and the colours reflected in the red-burning sky and lake, This is the beauty of Iceland🤩
I was awestruck by the wonders of nature
夜空に輝くオーロラ、そして赤々と燃える空と湖面に映る色彩、これぞ美しきアイスランドですね🤩
わたしは自然の驚異に見惚れました
写真の共有に感謝します🙏