system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is happening when something gets "sun bleached"?

For example, they say the flag the US planted on the moon during the Apollo 11 mission should be all white now due to "sun bleaching" what physics is happening here?
gpt
Ultraviolet rays cause damage over time, leading to breaking down the actual molecules of ink/dye/paint/etc that give something it's colour. Eventually all of the colour molecules are broken into smaller pieces and all colour is lost.