# IRAS: When We First Saw the Invisible Universe

# This is your Astronomy Tonight podcast. **March 9th: The Day We Caught Our First Glimpse of the Infrared Universe** Good evening, stargazers! On this date in 1983, humanity experienced what we might call a "cosmic awakening" when the Infrared Astronomical Satellite—or IRAS, as we affectionately call it—launched into orbit. And let me tell you, this little spacecraft absolutely changed *everything* we thought we knew about the universe. Before IRAS, we were essentially looking at the cosmos with our eyes half-closed. Visible light? Sure, we had that down. But the infrared universe? That was completely hidden from us—like trying to understand a concert by only listening to a few select notes while the entire symphony plays in frequencies you can't hear. When IRAS opened its infrared "eyes" to the heavens, it revealed an astonishing hidden cosmos. Dust clouds that were completely invisible suddenly blazed like beacons. Brand new stars being born in stellar nurseries lit up the night like celestial fireworks. And perhaps most dramatically, it discovered that many galaxies pour out MORE energy in infrared radiation than they do in visible light. Can you imagine? The universe was doing a cosmic light show we'd never even *seen* before! This 60-centimeter telescope changed the trajectory of astronomy for decades to come, discovering things from asteroids to distant galaxies, all while gliding silently through the vacuum of space. **So, stargazers, I encourage you to subscribe to the Astronomy Tonight podcast so you never miss these cosmic stories.** For more detailed information about tonight's sky or any astronomical events, be sure to check out **QuietPlease dot AI**. Thank you for listening to another Quiet Please Production!