The Universe We See Is Already Gone: Are We Looking Into the Cosmic Past? | Science 101

Science 101, now in its third season, ventures into one of the most mind-bending ideas in modern cosmology with “The Universe We See Is Already Gone.” Because light takes time to travel across the immense distances of space, every star, galaxy, and cosmic object we observe appears not as it exists today, but as it existed sometime in the past. The farther into space we look, the farther back in time we are seeing. Some of the stars illuminating our night sky may have already changed dramatically—or even ceased to exist—while their ancient light continues traveling toward Earth. This episode explores the speed of light, cosmic distances, lookback time, the observable universe, and how telescopes effectively allow scientists to peer into cosmic history. It’s a fascinating journey into the realization that when we look into the universe, we are also looking into the past. Hosted by Simplecast, an AdsWizz company. See https://pcm.adswizz.com for information about our collection and use of personal data for advertising.