Starlight continues to travel across the cosmos long after its sources have burned out — which means that we can see stars that no longer exist. It also means that our astronomers can study stellar formation without looking at the stars at all, but by observing the gamma rays that shoot out from distant galaxies interacting with the starlight. Take a closer look: https://go.nasa.gov/2G33gsA&h=AT2mbPrj5N1YVp76caneadyE80cXxz…q-2PIES2mQ
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