Rewinding the Universe with a New Telescope
Many of us wish we could travel back in time to undo embarrassing moments or regrettable decisions. It would be fascinating to witness personal milestones, or even travel as far back as the seventeenth century to observe how people lived. Imagine seeing dinosaurs in person and discovering whether or not they were as frightening as we imagine. Having lunch with cave people would be an interesting experience, but we would have to avoid becoming prey to the marsupial lion or giant hyena. Everyone would like to witness history, but the resulting chaos would be immense if the universe could rewind. The origins of the universe remain a mystery, and various theories have been proposed by scholars. Some believe that the universe always existed and that space and time emerged from it. However, we cannot speculate on the period before the Big Bang.