Is Time Travel Possible? The Universe’s Greatest Mystery | Time Travel Explained. Description::::::Is traveling through time possible? Can you go to the future? Or back to the past? Discover the science behind the ultimate “what if” in this video. ⏳ • How time travel to the FUTURE actually works (Relativity & Time Dilation) • What is the Grandfather Paradox? • The Novikov Principle - Is changing the past impossible? • Blueprints for a Time Machine: Wormholes, Black Holes & Cosmic Strings • Why h