Does the Universe Have an Edge?

Does the universe have an edge? Follow the light from the Moon and the Sun to distant galaxies and the cosmic microwave background, and discover why an observable limit is not a wall in space. This episode explains the difference between the age of the universe, the present size of the observable universe, and the unanswered question of whether the whole universe is finite or infinite. Subscribe to The Last Photon:    / @thelastphotonen   CHAPTERS 00:00 Does the Universe End? 01:00 Looking farther means looking back 02:36 What telescopes really show 04:18 A limit to information 05:58 The 92-billion-light-year puzzle 07:43 Light from before the stars 09:24 Finite, with no edge 11:06 A different picture of the universe IMAGES AND DATA NASA; ESA; CSA; STScI; ESO; SDSS; WMAP; Planck. Individual image credits appear on screen. Observational images are distinguished from diagrams, analogies, and illustrations. Illustrations and some visual sequences were created with AI; scientific labels and numerical graphics were composed separately. SCIENTIFIC SOURCES NASA, How Big is Space? https://www.nasa.gov/science-research... NASA, What is the Universe? https://science.nasa.gov/exoplanets/w... NASA, Webb and the Big Bang: https://science.nasa.gov/mission/webb... NASA, Cosmology FAQ: https://imagine.gsfc.nasa.gov/ask_ast... NASA, What is a Light-Day? https://science.nasa.gov/mission/voya... ESA/Hubble, Hubble Ultra Deep Field: https://esahubble.org/images/heic0406a/ NASA, Hubble Cosmological Redshift: https://science.nasa.gov/mission/hubb... NASA, Webb image colors: https://science.nasa.gov/mission/webb... NASA, WMAP overview: https://science.nasa.gov/mission/wmap... ESA, Finite or infinite? https://www.esa.int/Science_Explorati... Planck Collaboration, Background geometry and topology: https://arxiv.org/abs/1502.01593