I just can’t compute how this is possible. How can a telescope detect a gas, which isn’t even visible to the naked eye, on a planet that is an incomprehensible distance away.
[Source](https://www.bbc.co.uk/news/science-environment-66786611)
In: 143
This is my favourite part of astrophysics. Google “Fraunhofer lines”.
Emitted light, when we look at its wavelength spectrum, will contain missing “lines”, like a barcode.
The missing bits let us determine the elements that source of light has interacted with. This is how we know the makeup of Neptune’s atmosphere, for example.
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