10 Wild Things Scientists Found Using the James Webb Telescope

7. Time-Traveling Light Revealing Universe's Secrets

Webb's ability to observe infrared light that has traveled for over 13 billion years has enabled scientists to witness cosmic events that occurred when the universe was in its infancy, effectively allowing humanity to time-travel and observe the universe's earliest epochs with unprecedented clarity. The telescope's observations of light from the cosmic dawn – the period between 100 million and 1 billion years after the Big Bang – have revealed that the early universe underwent a period of rapid and violent evolution characterized by massive stellar explosions, galactic mergers, and black hole formation events that occurred with shocking frequency and intensity. These ancient light signatures show that the first generation of stars, known as Population III stars, were incredibly massive – some exceeding 300 times the mass of our Sun – and burned through their nuclear fuel so rapidly that they exploded as hypernovae within just a few million years of formation. Webb has also detected light from the epoch of reionization, when the first stars and galaxies began illuminating the universe and transforming it from an opaque, hydrogen-filled void into the transparent cosmos we observe today. Most remarkably, the telescope has captured light that reveals the universe's transition from a smooth, relatively uniform state to the complex web of cosmic structures we see today, showing how tiny quantum fluctuations in the early universe grew into the galaxies, galaxy clusters, and cosmic voids that define the modern cosmos.