Kinda, it's not that it bounces, it's that it passes through and is filtered by it. For example, passing light through a hydrogen gas cloud will remove some re

Kinda, it's not that it bounces, it's that it passes through and is filtered by it. For example, passing light through a hydrogen gas cloud will remove some red/IR wavelengths from the end result. We can measure those missing wavelengths and figure out what gasses it's passed through