https://www.cnet.com/news/listen-to-a-mars-sunrise-as-a-nasa-rover-view-becomes-song/

Data sonification is like the audio version of data visualization. The researchers scanned the Opportunity image pixel by pixel and picked out information on color and brightness, which they combined with data on the elevation of the terrain. Algorithms assigned pitch and melody to those data points.

"The quiet, slow harmonies are a consequence of the dark background and the brighter, higher pitched sounds towards the middle of the piece are created by the sonification of the bright sun disk," Anglia Ruskin University said.