Arecibo message

Shot at the “How to communicate with aliens” problem.

Minimum light response time: 50k years.

Neat techniques used:

– message is 23 x 79 (both primes), meaning that there are only two ways to make it into a rectangle. Using the wrong direction makes it clearly jumbled.

– human height encoded relative to wavelength of message

– solar system simplified representation. Drawing of human stands on top of earth representation.