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Space - infinite vastness ... Wait a minute! If the universe had a beginning, then there must also be a boundary - a horizon beyond which ... there is no longer any universe. Or? How big is the universe really? And how far can we actually see into it? In other words: what lies beyond the horizon? Our video on inflation: • Did the Big Bang really happen - and who... The video on the Hubble constant: • Are all measurements wrong? Crisis of the co... Chapters: 00:00 Intro 00:36 What is a horizon 02:27 The observable universe 08:39 The particle horizon 12:39 The Hubble radius 15:08 The event horizon 17:29 The entire universe Even more on the topic: Here is the middle! • Here is the middle! Suzanna Randall... Journey to the Edge of the World - Fascinating Universe with Harald Lesch: https://www.zdf.de/dokumentation/terr... Sources & further links: Expanding Confusion: Common Misconceptions of Cosmological Horizons and the Superluminal Expansion of the Universe https://www.cambridge.org/core/servic... • The Edge of an Infinite Universe Subscribe? Just click here: http://www.youtube.com/terrax_leschun... Terra X in the media library: https://www.zdf.de/dokumentation/terr... Terra X Harald Lesch in the media library: https://www.zdf.de/dokumentation/terr... Terra X on Facebook - / zdfterrax #TerraX #HaraldLesch #Science #Astronomy #Horizon #ZDF Moderation: Harald Lesch Author: Jana Steuer Editor: Victor Riley Production: Florian Rehm, Andrea Böhmer Producer:in (objektiv media): Anne Westphal Camera: Thorsten Eifler Sound: Noah Amshoff Editing: Dennis Burneleit Thumbnail: David Weber Graphics: Dennis Burneleit / Kurzgesagt Music by Extreme Music & YouTube Audio Library This video is a production of ZDF, in cooperation with objektiv media.