In our expanding universe, to look at increasingly distant objects is also like looking back in time to see things as they were billions of years ago. The very expansion of space expands this ancient light, shifting what was once visible to our eyes ever farther into the infrared spectrum. Spitzer was built to give us a way to capture this light from galaxies that formed and grew when the universe was young.

Spitzer has helped to find some of the most distant and ancient galaxies ever detected through their feeble infrared glow. It has also helped us to detect and understand cataclysmic events in distant galaxies connected to the turbulent conditions surrounding the supermassive black holes that lie at their very centers.

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