Stars come in a wide range of sizes, but how do we calculate a star's size to determine which is the biggest? In this episode of OOTW, we will find out how stars are measured to determine their mindblowing sizes, and above all, which of them are the largest stars.

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FOOTAGE:
The space scenes in this video were captured using SpaceEngine Pro, a virtual universe simulator:
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Get SpaceEngine on Steam: https://store.steampowered.com/app/31...

Stock footage provided by Videezy.com

Canis Majoris Nebula By Judy Schmidt Flickr: VY Canis Majoris Ejecta Shell, CC BY 2.0, https://commons.wikimedia.org/w/index...

WOHG64 Torus: By European Southern Observatory https://www.eso.org/public/images/eso..., CC BY 4.0, https://commons.wikimedia.org/w/index...

Canis Majoris Optical and Infrared: By ESO/Digitized Sky Survey 2. Acknowledgement: Davide De Martin ESO website, CC BY 4.0, https://commons.wikimedia.org/w/index...

MUSIC:
Two songs in this video were made by Chris Zabriskie. His music is absolutely fantastic and makes videos 10x better. He's just released a new album, so if you liked the music in this video, please consider checking out his YouTube channel and website.
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Abandon Babylon (New album from which the songs came: https://chriszabriskie.bandcamp.com/a...)

Dark Fog by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/...
Source: http://incompetech.com/'>http://incompetech.com/music/royalty...
Artist: http://incompetech.com/'>http://incompetech.com/

Ice Demon by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/...
Source: http://incompetech.com/'>http://incompetech.com/music/royalty...
Artist: http://incompetech.com/'>http://incompetech.com/

All other music provided by the YouTube Audio Library

SOURCES:
Why Do Stars Vary in Size: https://www.forbes.com/sites/startswi...
Determining Star Radius: https://forums.space.com/threads/how...
Metallicity Impact on Stars: http://adsabs.harvard.edu/full/1998A%...
Red Giant Sun: https://imagine.gsfc.nasa.gov/science...
Stellar Wind Composition: https://www.sciencedaily.com/releases...
Star Size Limits: https://futurism.com/istherealimit...
Parallax Visualisation and Maths:    • Stellar parallax and measuring distance  
Canis Majrois: https://www.constellationguide.com/v...
List of Largest Stars: https://en.wikipedia.org/wiki/List_of...

TIMESTAMPS:
0:00 Introduction
1:04 What Are Stars?
5:40 How Stars Become Huge
9:38 Problems with Direct Measurements
11:31 Parallax
13:01 Indirectly Measuring Stars
15:33 VY Canis Majoris
18:30 UY Scuti
22:59 Stephenson 218

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