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DESI’s 5,000 eyes will spend five years looking back in time at ancient light to better understand the story of the universe. By collecting this data they will be able to decode the light’s journey across the void. While we don’t have any functioning DeLoreans just yet, we do have telescopes and telescopes are real time machines. It is easy to forget that the images we see of space are never from the present –– that light has taken billions or millions of years to reach us. When we study deep space, we are studying the past, objects as they once were, not as they are now. We do this by studying photons.

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