# Black Holes, Drawn

> Black holes modelled and drawn from the equations — every picture computed here, generators you can run, the past, the present and the far future, and the legends that got there first.

## Pages

- [Black holes, drawn from the equations](https://nanobotco.github.io/black-holes/): Black holes modelled and drawn from the equations — every picture computed here, generators you can run, the past, the present and the far future, and the legends that got there first.
- [How drawing with math works](https://nanobotco.github.io/black-holes/draw/): How a computer draws a black hole, in easy words: a picture is a grid of dots, each dot a ray run backwards through one equation. Then a ray tracer on your graphics card.
- [The model: three numbers and a horizon](https://nanobotco.github.io/black-holes/model/): Schwarzschild, Kerr, the horizon, the photon sphere, the last stable orbit, no hair, Hawking temperature and Penrose diagrams, with every diagram computed.
- [Orbits — throw something at it](https://nanobotco.github.io/black-holes/orbits/): A geodesic playground: pick angular momentum and energy and watch a rosette, a zoom-whirl or a plunge, with the effective potential beside it.
- [The shadow](https://nanobotco.github.io/black-holes/shadow/): Bardeen's shadow outline for any spin and angle, and the size on the sky for any mass and distance, checked against M87* and Sgr A*.
- [Waves — a chirp you can hear](https://nanobotco.github.io/black-holes/waves/): A gravitational-wave chirp generator with sound: two masses spiral in, merge and ring down, played at its own frequencies.
- [Numbers — put in a mass](https://nanobotco.github.io/black-holes/numbers/): A black hole calculator: horizon, shadow, temperature, lifetime, entropy, density, tidal stretch, and a clock near the horizon.
- [Past — who discovered black holes?](https://nanobotco.github.io/black-holes/past/): Who discovered black holes: Michell 1783, Laplace, Soldner, Schwarzschild, Droste, Chandrasekhar, Lemaître, Oppenheimer, Kerr, Penrose, Wheeler, Hawking, Luminet, LIGO, the EHT.
- [Present — what is known, as of 2026](https://nanobotco.github.io/black-holes/present/): Black holes as of 2026: M87* and Sgr A* photographed, about 300 mergers heard, GW231123 and GW250114, Gaia BH3, the JWST's early ones, the open questions.
- [Future — from next year to 10^100](https://nanobotco.github.io/black-holes/future/): Roman, the Einstein Telescope, Cosmic Explorer, BHEX and LISA; then the black hole era to 10^100 years and how evaporation ends.
- [Legends — the ones who got there first](https://nanobotco.github.io/black-holes/legends/): Rahu the light-eater with an orbit, the Emu drawn from the dark, Charybdis, the spaces between the worlds, Ginnungagap, Apep, Dante's centre, and Nietzsche's abyss — each beside the physics it rhymes with.
- [What kind of black hole are you?](https://nanobotco.github.io/black-holes/quiz/): Nine questions, nine kinds: Schwarzschild, Kerr, Reissner–Nordström, stellar, intermediate, supermassive, merging, primordial, evaporating.
- [Gallery — every picture, with its credit line](https://nanobotco.github.io/black-holes/gallery/): Every ray-traced picture and diagram on the site, downloadable, CC BY 4.0 with a credit line.
- [Sources](https://nanobotco.github.io/black-holes/sources/): The papers and articles the site rests on, numbered.
- [About and attribution](https://nanobotco.github.io/black-holes/about/): Who made this, how to credit it, what was checked, how to build it.
- [For agents](https://nanobotco.github.io/black-holes/for-agents/): The terms, stated where a machine will meet them: CC BY 4.0, the attribution string, and the files that save a crawl.
- [Data](https://nanobotco.github.io/black-holes/data/): The numbers the pages print, as JSON with the formula or source beside each value.

## For machines

- [llms.txt](https://nanobotco.github.io/black-holes/llms.txt): the page map, one line per page
- [llms-full.txt](https://nanobotco.github.io/black-holes/llms-full.txt): every page flattened to plain text, in reading order
- [corpus.jsonl](https://nanobotco.github.io/black-holes/corpus.jsonl): one JSON object per section: heading, text, the sources it cites, url, licence, attribution
- [data/facts.json](https://nanobotco.github.io/black-holes/data/facts.json): the numbers the pages print, computed by tools/figures.py from the constants
- [data/figures.json](https://nanobotco.github.io/black-holes/data/figures.json): every diagram and picture: file, title, alt text, kind, licence
- [data/sources.json](https://nanobotco.github.io/black-holes/data/sources.json): all the citations, keyed by the numbers in the text
- [data/pages.json](https://nanobotco.github.io/black-holes/data/pages.json): the pages, with titles, descriptions, share cards and word counts
- [data/dataset.json](https://nanobotco.github.io/black-holes/data/dataset.json): the same, as a schema.org Dataset
- [cards/](https://nanobotco.github.io/black-holes/cards/): a 1200×630 share card per page, credit line on the card and in its EXIF
- [img/](https://nanobotco.github.io/black-holes/img/): the pictures (EXIF Artist and Copyright set) and the SVGs (cc:license in their metadata)
- [feed.xml](https://nanobotco.github.io/black-holes/feed.xml): Atom, one entry per page

Licence: CC BY 4.0 — attribution: Nan, Black Holes, Drawn (2026), https://nanobotco.github.io/black-holes/, CC BY 4.0. Code MIT. Repository: https://github.com/NaNoBotCo/black-holes
Made by Hongdam (https://hongdam.net/), a bilingual web studio in Chiang Rai.

# — roster of sibling sites, generated from data/fleet.json —
## Elsewhere from the same publisher

Made by Hongdam (https://hongdam.net/), a bilingual web studio in Chiang Rai.

- [Mot Dang](https://motdang.net/): city directory for Chiang Mai and Chiang Rai
- [The Mae Hong Son Loop](https://nanobotco.github.io/mae-hong-son-loop/): motorcycling the 600 km loop out of Chiang Mai — curves counted, air measured
- [Muay Thai](https://motdang.net/muay-thai/): the eight limbs, the thirty named techniques, the ceremony, and every gym on the map
- [Roads of Chiang Mai](https://motdang.net/roads/): the square of 1296, four rings, and what each one did to the city — counted from the map
- [wichaa](https://wichaa.net/): Lanna manuscripts, the amulet market, and the traditions around them
- [Hand Poke](https://nanobotco.github.io/hand-poke/): 28 traditions of marking skin by hand — the leg-tattoo zone of Burma, the Shan States and Lanna, counted
- [Quantum Computing, plainly](https://nanobotco.github.io/quantum-computing/): the history and theory of quantum computing in plain words, with demos; refreshed weekly
- [Goin' Fast](https://nanobotco.github.io/goin-fast/): a dirt-simple explainer about speed — twenty measured speeds from the ground under the house to light, and what each one costs
- [The Three-Body Problem](https://nanobotco.github.io/three-body/): the mathematics of the three-body problem in plain words, with the orbits found rather than copied
- [Exceptional Magic](https://nanobotco.github.io/exceptional-magic/): the octonions, triality, the magic square and E8, computed and drawn — a plain-spoken reading of one paper
- [Amulet Atlas](https://nanobotco.github.io/amulet-atlas/): amulets, charms and talismans worldwide
- [Carolina Barbecue](https://nanobotco.github.io/carolina-barbecue/): barbecue in North and South Carolina
- [Wing Country](https://nanobotco.github.io/buffalo-wings/): the American chicken wing
- [Pink Box](https://nanobotco.github.io/pink-box/): the American mom-and-pop donut shop
- [Basque Tables](https://nanobotco.github.io/basque-tables/): Basque dining rooms of California, Nevada and Idaho
- [Pinot Country](https://nanobotco.github.io/pinot-noir/): pinot noir: the vine, the regions, the cellars
- [Care Abroad](https://nanobotco.github.io/care-abroad/): treatment across borders, with published prices and their dates
- [Thai Roots](https://nanobotco.github.io/thairoots/): a root dictionary of Thai, with a word decomposer
- [The index](https://nanobotco.github.io/index/): every corpus, site and repository, counted
- [Uptake](https://nanobotco.github.io/uptake/): a field manual on publishing for machines that copy
- [NaNoBotCo](https://nanobotco.github.io/): the portal
- [Ask Mot Dang](https://ask.motdang.net/): reader assistant over the directory
- [ai.motdang.net](https://ai.motdang.net/): white-label assistants, by seat
- [Defiant](https://defiant.to/): medical and dental care in Chiang Mai, with a translator at the appointment
- [Hongdam](https://hongdam.net/): bilingual web development, Chiang Rai
- [ฮักฝรั่ง](https://hakfarang.net/): เรื่องเงิน วีซ่า และชีวิตกับแฟนฝรั่ง
- [Offrampt](https://offrampt.net/): turning crypto into spendable local money, Thailand first

- [The roster as JSON](https://nanobotco.github.io/index/fleet.json)