3/ Addendum: if you want to compare how astronomical objects look at optical vs infrared wavelengths, over the years we've made several interactive comparisons like these:
https://www.eso.org/public/images/comparisons/eso2307b/
https://www.eso.org/public/images/comparisons/eso2307c/
https://www.eso.org/public/images/comparisons/eso1205a/
You can find more here: https://www.eso.org/public/images/comparisons/
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