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
The simplest way to explain it is they break down the light that is passing through the atmosphere of the planet. Different gases have different effects on how light passes through them. With the right equipment, and most importantly knowledge, they can identify a lot of what an atmosphere is made of from amazing distances.
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