Brian Cox: Travel in the Past? Not without Light 💥🕳️ | Cosmic Microwave Wall Explained

Why can’t we see before 13.8 billion years ago? Brian Cox explains that the early universe was too hot and dense for light to escape — a glowing, opaque soup of particles. Only after 380,000 years did light begin its journey through space. 📺 Clip Source: Joe Rogan Experience #1233 - Brian Cox 🎙️ Speaker: Prof. Brian Cox #BrianCox #JoeRogan #BigBang #CosmicMicrowaveBackground #EarlyUniverse #Astrophysics #WhyUniverseIsOpaque #JRE #Shorts #ScienceExplained