The Milky Way galaxy isn't very active, as far as galaxies go. Every year, it produces around three to four Suns' worth of new stars in the entirety of its spiral body, and stars of all ages can be found sprinkled throughout.
, for which most star formation ceased long ago. In these galaxies, none or very few stars can be found younger than a certain age, suggesting that at some point most star formation abruptly ceased, leaving the galaxy to slowly wink out over the eons, star by star.
Using some of the world's most powerful telescopes, they have collected data in multiple wavelengths of light to identify galaxies whose light has traveled 9.5 billion to 12.5 billion years across the gulf of space-time – ancient galaxies like those elliptical galaxies closer to us in space and time, for whom star formation is on the brink of being snuffed out.
We all know nothing can emerge from beyond the event horizon of a black hole, but the space around it is a different matter. Material swirls around the black hole, like water circling a drain; the gravity and friction generate intense radiation that blazes across the Universe. Across such vast distances, galaxies are much harder to see; they are very small and very faint, from our point of view in the here and now. So the researchers had to 'stack' the galaxies together in order to emphasize the radio and X-ray light that are the telltale signs of an active supermassive black hole all those billions of years ago.
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