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kottke.org posts about photography

The Search for the Mystery Man Who Took These Forbidden Photos of Nazi-Occupied Paris

A photograph of German soldiers at the entrance to the Richelieu Drouot metro station in Paris, taken on July 14, 1940

A photograph of Paris' Le Meurice hotel in Rue de Rivoli flanked by the flags of Nazi Germany

In 2020, Stéphanie Colaux discovered an album of photos of Nazi-occupied Paris at a French flea market.

“As I flipped through the pages I realized, my God, it’s all scenes of [Nazi] occupied Paris. And I knew I’d found a treasure,” she says. “And then I read the little note in the front. ‘If you find this album,’ it said, ‘take care of it and have the courage to look at it.’ I thought, someone sent a message in a bottle and I just found it.”

The discovery set off a hunt for the unknown photographer, who took the photos at the risk of their own life — the unauthorized taking of such photos was “punishable by imprisonment or death”. The story of the search is very much worth reading.

Adding to the intrigue were the captions on the back of the photos, written in block letters as if someone were trying to mask their handwriting. Not only was the location, date and exact time of day noted, but there was also often a snarky caption about the German soldiers, whom the photographer referred to, pejoratively, as “Fritzes.”

One read: “After 10 months of Occupation, the Fritzes still can’t find their way around Paris.”

“The words are very sarcastic,” Broussard says. “There is a kind of irony. For example, he says ‘our protectors.’”

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Gobsmacking Image of a Stellar Nursery

A star cluster is shown inside a large nebula of many-coloured gas and dust. The material forms dark ridges and peaks of gas and dust surrounding the cluster, lit on the inner side, while layers of diffuse, translucent clouds blanket over them. Around and within the gas, a huge number of distant galaxies can be seen, some quite large, as well as a few stars nearer to us which are very large and bright.

Wow, check out this just-released image from the JWST team of star cluster NGC 602.

The local environment of this cluster is a close analogue of what existed in the early Universe, with very low abundances of elements heavier than hydrogen and helium. The existence of dark clouds of dense dust and the fact that the cluster is rich in ionised gas also suggest the presence of ongoing star formation processes. This cluster provides a valuable opportunity to examine star formation scenarios under dramatically different conditions from those in the solar neighbourhood.

It is very worth your time to click through and look at this image in all of its massive celestial glory. I found this image via Phil Plait, who calls it “one of the most jaw-droppingly mind stomping images I’ve seen from JWST” and, directing us back to the science (remember the science?!), notes that NGC 602 is actively forming stars (it’s only about 5 million years old) and that it depicts “the first young brown dwarfs outside our Milky Way”. Cool!

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Stuffies & Lovies That Have Been Loved Too Much

a brand-new stuffed animal next to a well-loved one

a brand-new stuffed animal next to a well-loved one

a brand-new stuffed animal next to a well-loved one

Too Much Love is a project from Katja Kemnitz in which she photographs the beloved dolls & stuffed animals of young children alongside brand-new versions of the same toys. Anyone who is a parent or caregiver can relate to the destruction on display here, as well as the difficulty of replacing these items.

I show old, much-loved teddies and dolls and compare them with as good as new doppelgangers. I think the broken stuffed animals have a lot of soul. The project is inspired by my older daughter, who took her plush dog everywhere when she was little. One day I found this dog again without button eye and torn seams in the store and bought it. She did not like him. The old one was better and could not be replaced.

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Artfully Arranged Junkyard Objects

dense photographic collage of junkyard object

dense photographic collage of junkyard object

dense photographic collage of junkyard object

dense photographic collage of junkyard object

In a continuation and tweak of his Coletivos project (which I posted about previously), Cássio Vasconcellos took aerial photos of scrapyards and arranged the junked cars, planes, trains, and other objects into dense photographic collages.

OVER presents a scenario that seems to point to a dystopian future, but which, in fact, brings together fragments of the present. The exaggerated agglomeration denounces the misleading idea of “disposal”, given that objects do not cease to exist in the world when we throw them away. Rather, they inhabit other places.

This video shows the artist’s process, from hanging out the side of a helicopter to arranging all the items in Photoshop.

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The Best Panoramic Photos of 2024

The results of the 15th annual Epson International Pano Awards have been announced — you can check out all the winners & runners-up on the competition website. Here are a few of my favorites:

an overhead view of a boat navigating rows of crops

a lightning strike illuminates a mountainous landscape

a wave crashes on rocks

a triangular hill leaves a long shadow

From top to bottom, the photos are by Tuan Nguyen Tan, Kelvin Yuen, Elliot McGucken, and Ignacio Palacios. (via in focus)

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Finalists for the 2024 Comedy Wildlife Photography Awards

one bird looks on as another crashes into a rock

The finalists of the 2024 Comedy Wildlife Photography Awards competition have been announced, so if you need a laugh, here you go.

a colorful mantis strikes a pose

a beaver covers its eyes

three raccoons sit in a tree; one looks like it's whispering something in another's ear

There are so many “tag yourself” moments in these photos. You can check out all of the finalists here and vote for the People’s Choice Award until Oct 31.

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Infinite Cosmos: Visions From the JW Space Telescope

book cover for Infinite Cosmos

Out today from National Geographic is Infinite Cosmos, a gorgeous-looking book by Ethan Siegel (intro by Brian Greene). It’s about the history of the JWST, humanity’s biggest ever space telescope, a machine that allows us to peer deeper & clearer into the universe than ever before, and some of the amazing results obtained through its use.

page spread of Infinite Cosmos showing the swirling Phantom Galaxy

Siegel wrote a piece about the book for Big Think, which includes an excerpt. Gravitational lensing is so cool:

Even with its unprecedented capabilities, JWST’s views of the universe are still finite and limited. The faintest, most distant objects in the cosmos — including the very first stars of all — remain invisible even in the longest-exposure JWST images acquired to date. The universe itself offers a natural enhancement, however, that can reveal features that would otherwise remain unobservable: gravitational lensing.

Whenever a large amount of mass gathers together in one location, it bends and distorts the fabric of the surrounding space-time, just as the theory of general relativity dictates. As light from background objects even farther away passes close to or through that region of the universe, it not only gets distorted but also gets magnified and potentially bent, either into multiple images or into a complete or partial ring. The foreground mass behaves as a gravitational lens. The amount of mass and how it’s distributed affect the light passing through it, amplifying the light coming from those background sources.

page spread of Infinite Cosmos showing how JWST images are colored

page spread of Infinite Cosmos showing the table of contents overlaid on an image of the JWST mirrors

Infinite Cosmos is available for purchase at Amazon and Bookshop.

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Kodak and the Invention of Popular Photography

In 1888, the Eastman Kodak Company rolled out a new camera and a new slogan. “You press the button, we do the rest.” To say this moment revolutionized photography would be an understatement. But this story isn’t just about Kodak. It’s about what happens when a powerful technology, originally only understood by a select few, can suddenly fit in your hand.

And then, fast-forwarding to the 90s and 00s, Kodak gradually, then suddenly, missed a similar shift that further democratized photography: the move to digital.

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The Williamsburg Bridge Riders

a biker exiting the Williamsburg Bridge bike path

a biker exiting the Williamsburg Bridge bike path

a biker exiting the Williamsburg Bridge bike path

a biker exiting the Williamsburg Bridge bike path

a biker exiting the Williamsburg Bridge bike path

a biker exiting the Williamsburg Bridge bike path

Adam DiCarlo takes photos of commuters (mostly bikers) as they exit the Williamsburg Bridge bike path on the Manhattan side and posts them to his Instagram account. (via @BAMstutz)

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Astronomy Photographer of the Year for 2024

photo of the ISS transiting the Sun

comparision of maximum solar activity with minimum solar activity

several stacked images of the Sun during an annular eclipse

the Milky Way stretches across the sky

Royal Museums Greenwich has announced the winners of the Astronomy Photographer of the Year 2024 competition. You can also check out some of the shortlist entries and runners-up in each category (Moon, Sun, etc.)

Photos above by (from top to bottom): Tom Williams, Peter Ward, Ryan Imperio, and Tom Rae.

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Irving Penn: Small Trades

black & white photo of two bakers

In 1950, master photographer Irving Penn set up a simple studio in Paris and started to photograph people of all kinds of professions, each wearing their work clothes and carrying the tools of their trade.

black & white photo of a man selling chestnuts from a cart

Working in the tradition of representing the petits métiers, Penn photographed fishmongers, firefighters, butchers, bakers, divers, baseball umpires, chefs, bike messengers, and sellers of goods of all kinds.

black & white photo of a deep sea diver posing

Penn continued photographing workers in New York and London, collecting the photos into a project called Small Trades.

black & white photo of two tradewomen carrying buckets

Penn said of the project:

Like everyone else who has recorded the look of tradesmen and workers, the author of this book was motivated by the fact that individuality and occupational pride seem on the wane. To a degree everyone has proved right, and since these photographs were made, London chimney sweeps have all but disappeared and in New York horseshoers — hard to find in 1950 — now scarcely exist.

A possible companion to Penn’s photographs: Studs Terkel’s Working: People Talk About What They Do All Day and How They Feel About What They Do. (Fun fact: Terkel and his editor got the idea for Working from Richard Scarry’s children’s book, What Do People Do All Day?)

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Vivian Maier: Unseen Work

The first major US retrospective of Vivian Maier’s photography is currently on display at Fotografiska New York through Sept 29. Maier was a street photographer whose work was discovered in 2007 and is now recognized “alongside the greatest masters of the twentieth century”.

black & white photo of a woman looking to the right in front of a building

black & white photo of two girls playing on the street in front of a car

black & white self portrait of Vivian Maier reflected in a store window

two black & white photos of a man and a child sittng on a bench with a balloon

photo of three people on a street corner, all wearing the color yellow

You can see much more of Maier’s work on this website of her work.

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The Disciples

For his project The Disciples, photographer James Mollison took photo montages of fans outside of music concerts. See if you can guess which concerts these groups of fans attended:

seven people who attended a Lady Gaga concert, wearing colorful, wacky clothes

seven people who attended a Merle Haggard concert, wearing mostly denim

seven people who attended a 50 Cent concert, wearing baseball caps, baggy jeans, and big jackets

eight people who attended a The Casualties concert, wearing leather and mohawks

eight people who attended a Tori Amos concert, wearing dark, muted colors

Here’s Mollison on the project:

Over three years I photographed fans outside different concerts. I am fascinated by the different tribes of people that attend them, and how people emulate celebrity to form their identity.

As I photographed the project I began to see how the concerts became events for people to come together with surrogate ‘families’, a chance to relive their youth or try and be part of a scene that happened before they were born.

Fascinating! From top to bottom: Lady Gaga, Merle Haggard, 50 Cent, The Casualties, and Tori Amos. Here’s a video featuring some of the photos accompanied by music from the corresponding artists:

Mollison published a book featuring the photos; a signed copy is available from his website.

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Baltic Ice

aerial shot of sea ice in the Baltic Sea

Oh, I really like this particular image from Bernhard Lang’s series of aerial photographs of sea ice in the Baltic (part one, part two). (via colossal)

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Riding With the Street Demon

Photographer Ryan Weideman worked as a NYC taxi driver for 35 years (1981-2016) and photographed his passengers while on the job.

woman in the back on a taxi cab peeking through the window

a young woman with a mohawk sitting in the back of a taxi

a woman sitting in the back of a cab

Huck did a profile of Weideman and his work several years ago.

“I drove a Checker cab but I usually got the wrecks because I only drove three or four nights a week,” he remembers wistfully. “I spent the rest of the time in my darkroom, printing and developing film.”

The quintessential New York cabbie, with a wisecracking mouth and lead foot on the gas pedal, Weideman carefully covered the first three letters of his license so that only the letters ‘DEMAN’ were visible. When passengers entered the cab, he would proudly announce, “You’re riding with the Street Demon.”

“I was on the edge of my seat most of the time because I was caught up in the rush of the ride,” he recalls. Although the 12-hour shifts were grueling, he never drank coffee or took drugs.

“It was all the adrenalin that flowed from my driving style. I enjoyed the thrill of driving and the sense of competitiveness. Some people really loved it; others were scared and wanted out so I would have to drop them off. Once in a while I would have a passenger that really enjoyed it. One guy jumped out of the cab and said, ‘My God, that was a religious experience!’”

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A Massive Trove of Aerial Photos of Glaciers

Over at Beautiful Public Data, Jon Keegan shares some details about two huge collections of aerial photos of glaciers.

aerial b&w photo of a glacier

aerial color photo of a glacier

As scientists study the effects of global warming, one of the most visible and alarming indicators is the rapid shrinking of glaciers. Government scientists have been documenting the size, shape, and movement of glaciers since the 1950s employing techniques ranging from direct field observations to aerial photography.

The United States Geological Survey (USGS) has one of the largest collections of aerial glacier photographs. Over 40 years, the USGS’ North American Glacier Aerial Photography (NAGAP) project captured thousands of striking high-resolution photos of glaciers and their surroundings.

From 1960 to 1983, self-taught glaciologist Austin Post used a 63-pound World War II-era Fairchild K-17 aerial reconnaissance camera to shoot over 100,000 glacier photos in the western US and Alaska. One of the bush pilots Post teamed up with was William R. Fairchild, who flew a Beech 18 twin engine airplane equipped with five K-17 cameras-one mounted on the nose, two in the belly of the plane, and one on each side.

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The 2024 Drone Photos Awards

The nominees for the 2024 Drone Photos Awards have been announced; here are a few that caught my eye:

drone photo of a highway crossing a frozen lake

drone photo of a crowded bull ring in Mexico

drone photo of a flock of white birds flying across a green expanse

drone photo of a small town in the snow

Photos by (from top to bottom) Sheng Jiang, Roberto Hernandez, Silke Hullmann, and Hüseyin Karahan.

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“The 25 Photos That Defined the Modern Age”

photos of Earthrise taken from Apollo 8, a woman and a child underneath a sign reading 'colored entrance', and Tank Man in Tiananmen Square

A group of photographers, editors, and curators recently convened to choose a list of “the 25 most significant photographs since 1955”. Choosing just 25 photos to represent 70 years of the richest visual era in human history is just an impossible task, so there’s bound to be some grousing about individual choices. (I love Beyoncé but really?) But the selection is fascinating, includes a few images I’d never seen before, and the accompanying discussion is worth reading.

I would love to see a process that asks for nominations across a
larger & broader range of folks and then whittle it down through ranked choice voting or pairwise ranking. Paging The Pudding

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“Planet of the Apes” Goes to a 70s Mall

an actor from Planet of the Apes dressed in an ape suit and wearing glasses

From Life magazine and photographer Ralph Crane, a gallery of outtakes from the filming of Conquest of the Planet of the Apes in 1972.

The Century City mall, selected for its futuristic appearance, was a primary battleground in the plot. LIFE staff photographer Ralph Crane came to the set and took pictures of the costumed actors in the mall, trying on shoes and making eyes at the lingerie store display, as well as eating in the mess hall with their masks half off. The pictures make for easy laughs, capturing the kind of shenanigans that help liven up a fourth Apes film in as many years.

(via daniel benneworth–gray)

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The Sky Was Purple and Red and Yellow and On Fire

a photo of the aurora borealis above windmills

a photo of the aurora borealis above some mountains

There was a big solar storm this weekend and photos of the aurora borealis took over social media; it was delightful. For round-ups, check out the NY Times, the Guardian, @itsjackcohen, PBS NewsHour, Spaceweather.com, Forbes, and MSN.

The photos above are by Albert Dros and Sean O’ Riordan (prints here). O’ Riordan took his shot in Tasmania and actually had to tone it down for publication:

When the clouds are glowing red you know something is off the charts, I tried my best to desaturate this and make it look some bit like a photo and not a science fiction scene!

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Fantastical Portraits of Cate Blanchett

photo of Cate Blanchett

I love these (haunting? are they haunting?) photos of Cate Blanchett taken by Jack Davison for this 2022 profile in the NY Times Magazine.

When the magazine asked the photographer Jack Davison to create the art for this story, he took inspiration from Cate Blanchett’s legendary gift at transforming herself on film. Over the course of a four-hour shoot, across nine different setups, Davison made the fantastical, perspective-bending portraits that appear here.

(via @gray)

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An Update on the Beloved Broccoli Tree

photo of a tree that resembles a broccoli floret

Do you remember the Broccoli Tree? Photographer Patrik Svedberg photographed a Swedish tree that resembled a broccoli floret over a number of years, posted the results to Instagram, and made the tree internet famous. Then some asshole vandal sawed through the branches of the tree and it had to be chopped down. John Green eulogized the Broccoli Tree in a video:

To share something is to risk losing it, especially in a world where sharing occurs at tremendous scale and where everyone seems to want to be noticed, even if only for cutting down a beloved tree.

Well, the stump of the tree was left in the hopes that it would grow again and I’m pleased to say that it has — here’s a photo from three years ago:

photo of a group of people gathered in front of a tree that looks like a bush

You can even see it on Google Maps. I’m glad the tree is growing again but wish the destruction hadn’t happened in the first place.

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Helsinki Bus Station Theory of Creativity

Several years ago in the Guardian, Oliver Burkeman wrote a piece called This column will change your life: Helsinki Bus Station Theory. It’s about how difficult it can be as a creative person to find your way to making work that feels like it’s uniquely yours.

There are two dozen platforms, Minkkinen explains, from each of which several different bus lines depart. Thereafter, for a kilometre or more, all the lines leaving from any one platform take the same route out of the city, making identical stops. “Each bus stop represents one year in the life of a photographer,” Minkkinen says. You pick a career direction — maybe you focus on making platinum prints of nudes — and set off. Three stops later, you’ve got a nascent body of work. “You take those three years of work on the nude to [a gallery], and the curator asks if you are familiar with the nudes of Irving Penn.” Penn’s bus, it turns out, was on the same route. Annoyed to have been following someone else’s path, “you hop off the bus, grab a cab… and head straight back to the bus station, looking for another platform”. Three years later, something similar happens. “This goes on all your creative life: always showing new work, always being compared to others.” What’s the answer? “It’s simple. Stay on the bus. Stay on the fucking bus.”

(via phil gyford)

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90 Women Photographers Celebrate Jane Goodall’s 90th Birthday

a tiny sea turtle swimming

Jane Goodall looks out over the jungle

a pack of sled dogs lounge on the snow

women in traditional Bolivian dress pose with a skatebaord

In honor of Jane Goodall’s 90th birthday, Vital Impacts organized a fundraiser selling 90 prints from 90 women photographers. The collection includes some of Goodall’s own work and 60% of the proceeds to the Jane Goodall Institute.

I’ve selected a few of my favorites above — photos by (from top to bottom) Hannah Le Leu, Jane Goodall, Tiina Itkonen, and Luisa Dörr (see also Female Bolivian Skateboarders Shred in Traditional Dress). (via colossal)

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The Pyramids of Giza, Shrouded in Mist

the Pyramids of Giza, shrouded in mist

the Pyramids of Giza, shrouded in mist

the Pyramids of Giza, shrouded in mist

the Pyramids of Giza, shrouded in mist

Wonderful shots of the pyramids of Giza by Egyptian photographer Karim Amr. From a caption on one of his photos three years ago:

I’m a 21 years old photographer you can see a lot of photos I share at the pyramids cause I just live near the pyramids so it’s easy for me to go and shoot there. I started doing photography to share my thoughts with others it’s how I express my feelings it’s also my escape from life. Life is tough and not easy for some of us and you got to find your place in this world.

Prints of his photos are available and you can follow his work on Instagram.

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The Best Photos and Videos of the 2024 Solar Eclipse

Well, the total solar eclipse was once again completely awesome. I didn’t have to go chasing all over tarnation this time, the telescope worked out amazingly well, and I got to share it with a bunch of first-timers, both in-person and via text. I’m going to share some thoughts, photos, and videos from others around the internet in an even bloggier fashion than usual. Here we go.

My pal Noah Kalina got one of my favorite shots of the day (see also + prints are available):

Solar Eclipse 2024 01

Gobsmacking shot from Rami Ammoun…it’s a blend of multiple exposures so you can see the sun and moon at the same time. Love this shot.

Solar Eclipse 2024 02

And another stunner from Andrew McCarthy:

Solar Eclipse 2024 09

Ryan Cox got some great shots of the solar prominences during totality.

Solar Eclipse 2024 03

Quick solar prominence explainer interlude: if you had a clear look at totality, you may have noticed some orange bits poking out around the moon. NASA: What is a solar prominence?

A solar prominence (also known as a filament when viewed against the solar disk) is a large, bright feature extending outward from the Sun’s surface. Prominences are anchored to the Sun’s surface in the photosphere, and extend outwards into the Sun’s hot outer atmosphere, called the corona. A prominence forms over timescales of about a day, and stable prominences may persist in the corona for several months, looping hundreds of thousands of miles into space. Scientists are still researching how and why prominences are formed.

The red-glowing looped material is plasma, a hot gas comprised of electrically charged hydrogen and helium. The prominence plasma flows along a tangled and twisted structure of magnetic fields generated by the sun’s internal dynamo. An erupting prominence occurs when such a structure becomes unstable and bursts outward, releasing the plasma.

A timelapse video of totality from Scientific American:

Thomas Fuchs caught some sunspots through his telescope during the partial eclipse. (We saw these through our ‘scope as well.)

Solar Eclipse 2024 04

Quick sunspot explainer interlude. NASA: What exactly is a sunspot?

A sunspot is simply a region on the surface of the sun-called the photosphere-that is temporarily cool and dark compared to surrounding regions. Solar measurements reveal that the average surface temperature of the sun is 6000° Celsius and that sunspots are about 1500° Celsius cooler than the area surrounding them (still very hot), and can last anywhere from a few hours to a few months. Sunspots expand and contract as they move across the surface of the sun and can be as large as 80,000 km in diameter.

Sunspots are magnetic regions on the sun with magnetic field strengths thousands of times stronger than the Earth’s magnetic field, and often appear in pairs that are aligned in an east-west direction. One set will have a positive or north magnetic field while the other set will have a negative or south magnetic field. The field is strongest in the darker parts of the sunspots — called the umbra. The field is weaker and more horizontal in the lighter part-the penumbra. Overall, sunspots have a magnetic field that is about 1000 times stronger than the surrounding photosphere.

This Instagram account has a lovingly assembled collection of solar eclipse stamps from around the world (Aruba, Bhutan, Chile, Romania, Kenya, and even North Korea).

Solar Eclipse 2024 05

A NY Times timelapse: See the Total Solar Eclipse’s Shadow From Space (assembled from NASA and NOAA satellite imagery).

Great solar prominences on this shot from Notorious RBMK. Wow:

Solar Eclipse 2024 06

A timelapse video from Ariel Waldman of totality in Mazatlán. You really get a sense of the eclipse as a passing shadow from this.

Incredible “tiny planet” panorama timelapse by Matt Biddulph. Here’s a still frame during totality:

Solar Eclipse 2024 07

The 8 types of eclipse photo from XKCD.

Solar Eclipse 2024 08

The view of the eclipse from the International Space Station.

More photos from The Dammich, fotoelliott, max GORDON, good thread of photos, and photo round-ups from PetaPixel, New Scientist, BBC Science Focus, Mashable, Associated Press, and Wired.

Video from Nate Luebbe of the moment of totality, with Baily’s beads and solar prominences.

This is a fake. Super super cool looking, but a fake. (Update: not quite a fake, just a really badly enhanced version of this composite HDR photo.) And I’m not sure I entirely trust the veracity of the trending search results for “why do my eyes hurt” but here it is anyway.

Earth Will Have Its Last Total Solar Eclipse in About 600 Million Years:

Total solar eclipses occur because the moon and the sun have the same apparent size in Earth’s sky — the sun is about 400 times wider than the moon, but the moon is about 400 times closer.

But the moon is slowly moving away from Earth by about 1-1/2 inches (4 centimeters) per year, according to the NASA statement. As a result, total solar eclipses will cease to exist in the very distant future, because the apparent size of the moon in Earth’s sky will be too small to cover the sun completely.

“Over time, the number and frequency of total solar eclipses will decrease,” Vondrak said in the statement. “About 600 million years from now, Earth will experience the beauty and drama of a total solar eclipse for the last time.”

If you want to get a headstart on trip planning, the next eclipse is going to be in Greenland, Iceland, and Spain on August 12, 2026. Cloud cover looks most favorable in Spain.

Ok, that’s all for now. Depending on what else I come across, I might update this post periodically throughout the day. I know some of you who were lucky enough to see the total eclipse shared your experiences in the comments of yesterday’s post but feel free to do so here as well.

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Farm Animal Family Photos

a group of farm animals posing together, as in a family photo

a group of farm animals posing together, as in a family photo

a group of farm animals posing together, as in a family photo

Rob MacInnis takes these great family photos of farm animals. I mean, gold medal to anyone who can actually get a chicken, dog, goat, sheep, cow, and horse to pose together like that. I also like his photo of this charming sheep.

You can check out more of his work on Instagram and his website. (via present & correct)

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Swirling Magnetic Fields Visible in New Black Hole Images

swirling image of the black hole at the center of the Milky Way galaxy

swirling image of the black hole at the center of the M87 galaxy

It’s been about five years since scientists captured the first blurry image of a black hole. Using what they learned from that experience, they’ve teased out some more detailed images of the black holes at the centers of the Milky Way galaxy (top) and the M87 galaxy (bottom). The process of collecting the data for these images is interesting:

The only way to “see” a black hole is to image the shadow created by light as it bends in response to the object’s powerful gravitational field. As Ars Science Editor John Timmer reported in 2019, the EHT isn’t a telescope in the traditional sense. Instead, it’s a collection of telescopes scattered around the globe. The EHT is created by interferometry, which uses light in the microwave regime of the electromagnetic spectrum captured at different locations. These recorded images are combined and processed to build an image with a resolution similar to that of a telescope the size of the most distant locations. Interferometry has been used at facilities like ALMA (the Atacama Large Millimeter/submillimeter Array) in northern Chile, where telescopes can be spread across 16 km of desert.

In theory, there’s no upper limit on the size of the array, but to determine which photons originated simultaneously at the source, you need very precise location and timing information on each of the sites. And you still have to gather sufficient photons to see anything at all. So atomic clocks were installed at many of the locations, and exact GPS measurements were built up over time. For the EHT, the large collecting area of ALMA-combined with choosing a wavelength in which supermassive black holes are very bright-ensured sufficient photons.

The images of the two black holes look similar, which was somewhat unexpected:

While this idea may initially sound somewhat mundane, it is anything but. The result is surprising because Sgr A*’s mass is about 4.3 million times that of the Sun, while M87*’s is about 6.5 billion times that of the Sun. Despite the significant difference in mass between the two supermassive black holes, the fact that their magnetic fields behave similarly and are both well-organized is an incredible discovery.

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The Vela Supernova Remnant

an image of the Vela supernova remnant

This stunning 1.3 gigapixel image of the Vela supernova remnant comes to us courtesy of the Dark Energy Camera at the Cerro Tololo Inter-American Observatory in Chile. From PetaPixel:

The Vela Supernova remnant, located about 800 light-years away from Earth, is the cosmic corpse of a massive star that exploded 11,000 years ago. It is one of the closest supernova remnants to Earth and the perfect subject for the remarkable Dark Energy Camera.

The supernova is a vast cosmic structure about 100 light-years across. For context, one would have to travel around the Earth 200 million times to have traveled a single light-year.

an image of the Vela supernova remnant that shows some of its structure

The full image of the supernova remnant is worth exploring. You can also watch this zoom-in of the image to observe the high level of detail available.

(via colossal)

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