Top all-time · #14896
James’ Space Blog
Personal blog · 20k.github.ioprogrammingscience
James’ Space Blog is a personal blog at 20k.github.io about programming and science. Since 2024, 5 different Hacker News readers have linked it 5 times. It is still writing: the last post was on 2025-05-07, and you can follow it by feed.
Too few sampled comments (1) to say how often HN recommends it.?
Why HN links it
The blog covers a physically accurate black hole visualisation that can run in a room. The one comment links an image from the blog showing an accretion disk's colour and brightness, and explains why such disks look blue.
Summarised by Claude from a sample of 1 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Ramblings on C++, OpenCL, and GPU programming
What Hacker News says?
They're blue, in general black hole accretion disks are very hot, and anything past a certain temperature looks pale blue as follows: https://20k.github.io/assets/kerraccrete.PNG This is a colour and relative brightness accurate example of a hot accretion disk. The size, emissivity and absorption are set to arbitrary parameters, but this is human-eye-colour accurate with proper doppler and radiative transfer You can…
Comment linking /assets/kerraccrete.PNG
on “Show HN: Physically accurate black hole you can put in your room”Submitted Implementing General Relativity: What's inside a black hole? as a story · 13 points
HN discussionSubmitted Numerical Relativity 101: Simulating spacetime on the GPU as a story · 4 points
HN discussionSubmitted Implementing General Relativity: Rendering the Schwarzschild black hole, in C++ as a story · 2 points
HN discussionSubmitted Simulating fast binary black hole collisions on the GPU as a story · 1 points
HN discussion
