NASA’s Sofia Discovers Water on Sunlit Surface of Moon
It blows my mind a little bit that spectrosocopy is a thing that just happens to be afforded us by physics, and how much less we'd know about the universe if it didn't exist. "Oh, every element has a totally unique signature and all you need to do is <i>look at it</i> to tell what it is, no matter how many miles or light-years away." It's the kind of thing where if it only existed in a sci-fi novel, it would be considered a far-too-convenient plot point.<p><a href="https://en.wikipedia.org/wiki/Emission_spectrum" rel="nofollow">https://en.wikipedia.org/wiki/Emission_spectrum</a>