Using tweet-sized programs in BBC Basic, Paul Malin’s procedural art makes images of space…
Amazing! Each image is generated by one tweet of BASIC code for an 8-bit computer, written by @P_Malin for @bbcmicrobot. Look closely
You can run them in your browser - but they might take literally hours to run at 2MHz 6502 speeds. There is, handily, a JIT mode to Owlet which finishes in just a few seconds - see the little 
icon.
Two galaxies
Planetary nebula (see original here)
Spiral Galaxy
Carina Nebula
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See also
Deep Field
Gravitational Lensing