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 video](https://youtu.be/gVZwdYZqCUI?si=67fe_IaIBULGsoBn) has some more specifics as to how we know what materials distant celestial bodies are made from and how that is synonymous with the light we can see coming from distant planets.
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