https://www.perplexity.ai/search/biggest-questions-in-the-unive-Hjmlt5c1SF6GCtvDyyNaMA The biggest questions in the universe revolve around its origin, nature, composition, and fate, as well as the existence of life beyond Earth. Key questions include: How did the universe begin? What happened before or at the Big Bang? What is the nature of dark matter and dark energy, which together make up about 95% of the universe but remain mysterious? Will the universe ever end, and if so, how? (e.g., Big Crunch, Big Freeze, or Big Rip) Does life exist elsewhere in the universe? How do black holes work, and what happens to information inside them? How can gravity be reconciled with quantum mechanics? What is the true nature of spacetime and why does it have the properties it does? Are there other universes beyond our own? These questions are fundamental to understanding the cosmos and remain largely unanswered despite advances in cosmology and astrophysics. They continue to drive scientific research and exploration. In summary, the biggest questions include the universe’s origin and fate, the nature of dark matter and dark energy, the existence of extraterrestrial life, the workings of black holes, and the fundamental laws of physics.