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I’ve looked at the very small scale of the universe, what about if I go the other way and have a look at the large scale of the universe, what is out there? Lets find out more. I’m going to start off with the SI base unit of length, the metre. I’ll try and do as many conversions to imperial units as I can, but I’ll stop once we get to light years. I’m going to go up in scale looking at both the size of objects and distances involved as we go from the metre upwards. This is also going to be my longest video to date, so bring snacks. Let’s get on shall we. So to start we have the metre. This is 3.28 feet and the standard length measurement in the SI system. It was originally defined as 1, 10 millionth of the distance from the north pole to the equator. After a number of redefinitions, it was finally defined in 1983 as the distance light travels in 1 over 299 792 458 ths of a second. In fact we’ve now set the speed of light so that any revisions of the speed of light wouldn’t change the speed of light itself, they’d alter the size of a metre. Chapters 0:00 Introduction 0:42 The Metre 3:39 1 Kilometre 6:11 1000 Kilometres 9:16 1 million Kilometres 11:39 1 Billion Kilometres 15:13 1 Trillion Kilometres 16:04 1 Light Year (roughly) 22:32 1000 Light Years 26:09 1 Million Light Years 29:58 1 Billion Light Years Dimorphos Image Credit By NASA/Johns Hopkins APL - https://www.nasa.gov/feature/dart-s-final-images-prior-to-impact (image link); original upload from https://dart.jhuapl.edu/Gallery/ (image link), Public Domain, https://commons.wikimedia.org/w/index.php?curid=123433723 Map of Tethys NASA/JPL-Caltech/Space Science Institute Map of Rhea NASA/JPL-Caltech/Space Science Institute Map of Triton NASA/JPL-Caltech/Lunar & Planetary Institute Map of the moon NASA's Scientific Visualization Studio Map of Io US Geological Survey Astrogeology Research Program Map of Ganymede A Map of GanymedeNASA (original photographies)/Björn Jónsson/Feldo, CC BY-** 4.0 https://creativecommons.org/licenses/by-**/4.0, via Wikimedia Commons Jewel Bug Nebula Image NASA, ESA, and J. Kastner (RIT) https://esahubble.org/images/heic2011c/ Helix Nebula Image NASA, ESA, C.R. O'Dell (Vanderbilt University), M. Meixner and P. McCullough (STScI) Crab Nebula image By NASA, ESA, J. Hester and A. Loll (Arizona State University) - HubbleSite: gallery, release., Public Domain, https://commons.wikimedia.org/w/index.php?curid=516106 Veil Nebula Image NASA, ESA, Hubble Heritage Team https://esahubble.org/images/heic1520a/ Tarantula nebula IMAGE: NASA, ESA, CSA, STScI, Webb ERO Production Team https://webbtelescope.org/contents/media/images/2022/041/01GA76MYFN0FMKNRHGCAGGYCVQ Sextans A Image KPNO/NOIRLab/NSF/AURA Data obtained and processed by: P. Massey (Lowell Obs.), G. Jacoby, K. Olsen, & C. Smith (AURA/NSF) Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab) Triangulum Galaxy Image ESO https://www.eso.org/public/images/eso1424a/ Sombrero Galaxy Image NASA/ESA and The Hubble Heritage Team (STScI/AURA) https://esahubble.org/images/opo0328a/ Hoag’s Object By NASA and The Hubble Heritage Team (STScI/AURA); Acknowledgment: Ray A. Lucas (STScI/AURA) - http://hubblesite.org/newscenter/archive/releases/2002/21/image/a/http://antwrp.gsfc.nasa.gov/apod/ap020909.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=610534 NGC 404 (Mirach’s Ghost) Galaxy en:NASA, en:STScI, en:WikiSky, Public domain, via Wikimedia Commons M81 Image By NASA, ESA and the Hubble Heritage Team (STScI/AURA) - http://www.spacetelescope.org/images/heic0710a/ (very high quality ([cdn.spacetelescope.org/archives/images/screen//heic0710a.jpg JPEG file] 346 MB) http://hubblesite.org/newscenter/archive/releases/2007/19/image/a/ (direct link), Public Domain, https://commons.wikimedia.org/w/index.php?curid=2173424 Sloan Great Wall Image Pablo Carlos Budassi, CC BY-** 4.0 https://creativecommons.org/licenses/by-**/4.0, via Wikimedia Commons GN-z11 image NASA, ESA, P. Oesch (Yale University), G. Brammer (STScI), P. van Dokkum (Yale University), and G. Illingworth (University of California, Santa Cruz) https://hubblesite.org/contents/news-releases/2016/news-2016-07.html; see also https://www.nasa.gov/feature/goddard/2016/hubble-team-breaks-cosmic-distance-record/ and http://www.spacetelescope.org/images/heic1604a/