Phys.org -
1 Dec 2021 16:42

Do you know what the Earth's atmosphere is made of? You'd probably remember it's oxygen, and maybe nitrogen. And with a little help from Google you can easily reach a more precise answer: 78% nitrogen, 21% oxygen and 1% Argon gas. However, when it comes to the composition of exo-atmospheres--the atmospheres of planets outside our solar system--the answer is not known. This is a shame, as atmospheres can indicate the nature of planets, and whether they can host life.
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