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49531 | 2 years ago

I thought it was just light? Light bounces off of different molecules differently?

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malfist|2 years ago

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