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 possibly a dumb question: If the planets we observe are theoretically in the past, does that mean the elements we observe on the planet are also in the past?
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