JWST reveals spiral galaxies’ life cycles, from dust to stars
<p>If there’s one rule that’s practically universal in astronomy, it’s this: you can only observe the parts of the Universe that your instruments are sensitive to. As a result, when most of us think about the objects that are out there in the cosmos, we think about the components that are easiest to see: things that are bright, close by, and that emit radiation in the form of visible light. When we think of galaxies, we think of the stars within them; when we think of stars, we think primarily of the ones that appear brightest to our eyes and in our telescopes. But there’s a whole Universe out there to explore, and much of it doesn’t emit any visible light at all.</p>
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