Space and Time Might Be an Illusion | NOVA | PBS

A cosmic experiment tests the fabric of the universe. This video was originally produced in 2019. Physicists have long debated the reality of "spooky action at a distance," otherwise known as quantum entanglement. Albert Einstein believed that physical properties, like position or momentum, were definitive and did not change whether anyone observed them or not. But Niels Bohr believed that quantum systems existed in superposition and properties only became definite when measured. Now, a team of researchers conduct a cosmic Bell test using light from quasars billions of light-years away. By using ancient light to control their experiment, they aim to close a major loophole and show if reality is as strange as quantum mechanics suggests. 📺 Watch the full documentary, "Einstein's Quantum Riddle": https://www.pbs.org/wgbh/nova/video/e... 📰 Stay up to date on the latest science discoveries, full episodes, articles, videos, and more by signing up for NOVA's newsletter here: https://to.pbs.org/4brCC7Y ▶️ Stream NOVA documentaries & more with PBS Documentaries on Prime Video: https://amzn.to/4hXBlsu 💙 Help us bring the universe closer to home. Your donation ensures that NOVA’s deep-space discoveries and quantum physics explorations remain free and inspiring for the next generation of scientists. Support fact-based storytelling today. https://bit.ly/48UnsrD 🌟 Follow on social for more NOVA content Twitter:   / novapbs   Instagram:   / novapbs   TikTok:   / novapbs