kottke.org posts about astronomy
To create this composite image, photographer Brendan Larsen captured almost 600 photographs over a two-hour period and then manually stitched them together.
This is the most time-consuming photo edit I’ve EVER done!
I left my camera photographing the night sky over Mt Taranaki for nearly TWO HOURS, capturing 578 photographs.
The result? An estimated 14,450 satellite trail appearances, representing approximately 1,400 individual satellites! 😱
I manually masked in EVERY SINGLE TRAIL from the original photographs — approximately 45 HOURS of editing to create this one image!
The Guardian has more on how he created the image (which, despite many online commenters’ beliefs, is not AI):
Larsen, 51, says he set his camera up to take an unlimited number of eight-second-long shots, with a two-second gap in between each photo. “I left her running for two hours and captured 578 photos … That was the easy part.”
The hard part came next. Larsen spent about 45 hours layering the individual photos – each of which contained about 25 satellites – over one another, using Adobe Photoshop. Much of the time was spent painstakingly erasing stars, to reveal the satellites.
“I could start to see the pattern emerging and realised: ‘Wow, this looks really awesome.’ I knew if I carried on it would look even better and more impressive in terms of satellite numbers.”
Fellow photographer Vincent Laforet called Larsen’s image “an important photograph”:
I was initially startled. Then confused. Then fascinated all in quick succession.
And then I felt a deep sense of betrayal once I realized that what I was tracking with my eyes were a series of small satellites. And btw: that they likely had ruined my long exposure that I was capturing at the time.
I remember asking in the moment:
Who gave anyone permission do this?
Portuguese photographer Rui Santos captured this shot of the recent solar eclipse.
Stunning. Here’s what makes this shot look a little different from other eclipse photos; from APOD:
Usually the solar corona appears white, and to some observers the corona of last week’s total solar eclipse did appear this pearly color. But this time, totality observers in Spain saw a corona that appeared unusually golden. For one reason, from Spain, the totality occurred when the setting Sun was near the horizon. That low, sunlight travels through a large amount of air which scatters out blue light. An unusual amount of smoke in the air from nearby forest fires acted as a second filter, further scattering the remaining blue tones and deepening the already gold-dominated light.
Using high-definition open source videos and photos from NASA and his own music, John Boswell (aka Melodysheep) created this mesmerizing eight-minute video recap of the Artemis II mission that enchanted us all back in the spring. Like all of his videos I’ve featured on KDO, this one is really well done.
See also Animated Artemis II Photos Reveal Satellites Buzzing Around Earth and Stunning Artemis II Phone Wallpapers. (via colossal)
Rockwood, Texas is home to a unique business, Starfront Observatories. Owner/operator Bray Falls hosts hundreds of other people’s telescopes in perfect conditions — ultra-dark skies (Class 1 on the Bortle scale), clear weather, and fast internet — so astrophotographers from around the world can run their scopes and make observations completely from their computers.
Out in the middle of nowhere Texas, a young astrophotographer is running one of the largest telescope ranches on Earth. Stargazers from around the world ship their gear to Bray Falls, who tends 550 telescopes (and counting) on 40 acres outside Brady, the geographic heart of Texas. Customers control the scopes from a laptop anywhere on the planet for as little as 99 dollars a month. We dropped by Starfront Observatories on a perfect dark sky night to see how the operation actually works.
I first learned about telescope ranching late last year from astrophotographer Ian Lauer; he’s got a good video about Starfront Observatories as well:
The imagery produced by the telescopes on this ranch is impressive. Here’s one of Falls’ own images, a nebula he discovered called The Crown of Thorns Nebula.
I’ll start this off by saying this nebula should not be here! Supernova remnants are the remains of stars which detonated long ago. Nearly all supernova remnants in the sky exist within 10° of the Milky Way band, where the greatest density of stars can be seen.
This remnant lives 42° off the beaten path in VIRGO! It is a remnant that stands alone surrounded by nothing. It is the only supernova remnant in the constellation Virgo.
It is so far from where it should be, that my scientist friend Dr. Robert Fesen has doubts that it could be what we think it is, and so a professional observatory has collected data on the object and is now studying it.
Ok, this is incredible: this person on Reddit discovered that if you take a bunch of the sequential photos of the Earth captured by the Artemis II crew and animate them, you can see that some of what appear to be stars are actually satellites, buzzing around the Earth like flies. You can see them really clearly in Seán Doran’s remastered animation. Totally totally gobsmacking. Literally awesome.
An amazing capture of galaxy Messier 104, aka the Sombrero Galaxy, by the 570-megapixel Dark Energy Camera mounted on a Chilean observatory.
The Sombrero galaxy (Messier 104) is a galactic masterpiece that captivates scientists and astronomy enthusiasts alike. Its intricate system of globular star clusters lends insight into stellar populations, and astronomers are intrigued by the supermassive black hole at its center. Its distinctive visual features and relative brightness make it a favorite among amateur astronomers. The fascinating story of its discovery, involving three esteemed astronomers, has earned it a spot on one of the most important lists of deep sky objects. Today, it stands as one of the most iconic galaxies in the night sky.
If you want the full image, you can download the 725 MB file from the project’s site. (via petapixel)
NASA has made available more than a dozen mobile wallpapers of photos taken during the Artemis II mission for free download. Basic Apple Guy has made some wallpapers of his own (that are slightly larger than NASA’s and better for iPhones). I have also made a few of my own: Earth Rising Over the Moon With the Orion Capsule in the Foreground, A Sliver of Earth Over the Moon, and Kubrickian Earth.
Here are a few of my favorites:
Interstitial tip: if you’re using an iPhone with iOS 26, tap the Spatial Scene button when you’re editing your wallpaper and the phone will turn any of these images into a 3D-ish scene that moves when you move your phone. Works best with images containing multiple objects (like the Earthrises). Makes you feel a little bit more like you’re there. (This is also an amazing setup.)
These are all real photos, cropped from the originals shared by NASA on Flickr and their website.
I also went back and looked at some of the images from the Artemis I mission, which sent an Orion capsule around the Moon without a human crew. Here are a few wallpapers made from photos from that mission: Earth Moon Capsule, Lens Flare Trio, and Lunar Surface.
Again, these three are from the Artemis I mission in late 2022. The first one works especially well with the Spatial Scene mode on iOS 26.
This shot from Artemis II of the Moon eclipsing the Sun is one of the most breathtaking astronomical photos I’ve ever seen. Holy shit.
Captured by the Artemis II crew during their lunar flyby on April 6, 2026, this image shows the Moon fully eclipsing the Sun. From the crew’s perspective, the Moon appears large enough to completely block the Sun, creating nearly 54 minutes of totality and extending the view far beyond what is possible from Earth.
Thanks to KDO reader Scott for pointing me to NASA’s Flickr account, which is possibly the easiest way to look at photos taken by the Artemis II mission. Like this one:
And this one — then maybe I’ll stop (maybe):
P.S. If you need some Artemis II wallpapers for your phone, right this way.
I love this planet & stars chart from XKCD because it’s technically correct but also completely useless.
During the recent annular solar eclipse on February 17, the ESA’s PROBA-2 satellite captured this great shot of the Moon passing in front of the Sun. Cue up the Johnny Cash.
This week, the Earth was hit with one of the strongest geomagnetic storms in recent years, which made for some gobsmacking displays of the northern lights, even as far south as California. Cruising in a 787 at 37,000 feet on his route from Calgary to London (UK), airline pilot Matt Melnyk had perhaps the best view in the world of the aurora and captured some fantastic shots. He told space.com that “This was the most incredible display of aurora I’ve ever seen in my 20 years of flying!”
This video by Ian Lauer is an excellent accessible explanation of the basics of astrophotography as he runs through the process of how he captures a long-exposure image of the Andromeda galaxy.
This picture is still black and white — and no, the galaxy is not devoid of color. There’s actually color in there, and we’ll get to color in a second. But first, let’s look at what happens when I zoom in on this image.
You can see there’s some graininess in this image, which we call noise. And we hate it because it prevents you from seeing more detail in your image. To combat the noise, we can take multiple images of that same target — so, one after the other — and stack them together using software to average out all of that background noise.
Take a look at what happens when we do that. This image isn’t just a single 1-minute image but 10 1-minute images stacked on top of each other. Look how how much better, how much cleaner, it looks when compared to the single 1-minute image.
There are a bunch more videos on Lauer’s channel to check out, including Shooting the Milky Way from Every Light Pollution Level and The BEST Telescope for Beginners (he recommends the Seestar S50 Astronomical All-in-one Smart Telescope, which many other people recommended on social media instead of anything on this list). Oh, and I’m gonna watch this one about astrophotography with the iPhone 17 Pro right now. (via the kid should see this)
Skydiver & musician Gabriel Brown and astrophotographer Andrew McCarthy teamed up to capture these incredible photos of Brown transiting the Sun while skydiving. You can see a video of the jump and some behind the scenes calculations on Instagram.
We had to find the right location, time, aircraft, and distance for the clearest shot; while factoring in the aircraft’s power-off glideslope for the optimal sun angle and safe exit altitude. Then we had to align the shot using the opposition effect from the aircraft (shout out to the pilot @jimhamberlin) and coordinate the exact moment of the jump on 3-way coms!
As if that wasn’t hard enough, we had a myriad of malfunctions that almost led to the shot not being captured… But as you can see, against all odds, we got it on the sixth try!
That sounds….complicated. But the results speak for themselves. More coverage of this on Petapixel and Colossal.
As Petapixel notes, the photos are composite shots:
After he captured the shot of Brown, he then made the image “super high-res” by shooting the Sun on another telescope and “assembled a mosaic of the entire Sun”, which he later matched with the features in Brown’s photo.
(thx, alex)
Even after reading a couple of reviews and watching the trailer, it’s difficult to understand what the Austrian film Little, Big, and Far is actually about. So here’s the official synopsis:
Austrian astronomer Karl is at a crossroads in his life and work. He finds his physicist wife growing distant and his job being reshaped by environmental crises as thoughts about science, fascism, and his grandson’s future spin above his head. After attending a conference in Greece, Karl decides not to return home and heads for a small island in hopes of finding a dark enough sky to reconnect with the stars. Abandoned at a remote mountain trail, he ascends and waits for darkness to fall.
A gem of a find by The Public Domain Review of a collection from the Rijksmuseum: photographs of plaster models of the Moon’s surface that were made from observations of the Moon through a telescope.
Peering through a self-made telescope, James Nasmyth sketched the moon’s scarred, cratered and mountainous surface. Aiming to “faithfully reproduce the lunar effects of light and shadow” he then built plaster models based on the drawings, and photographed these against black backgrounds in the full glare of the sun. As the technology for taking photographs directly through a telescope was still in its infancy, the drawing and modelling stages of the process were essential for attaining the moonly detail he wanted.
These are incredible; I love them so much. While Nasmyth’s models were spikier than the Moon’s actual surface, they still look amazingly realistic for something produced in the 1870s. (The 1870s!)
The book from which these were taken also contains this page, where Nasmyth seems to hypothesize that certain mountain ranges on the Moon (and Earth?) are formed by “shrinkage of the globe”:
You win some, you lose some. 🤷♂️
See also Henry Draper’s photographs of the Moon from the 1860s and 1870s.
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