What are stars? How do stars get so big? And what is the largest known star in the universe? Take an animated journey through the universe with Kurzgesagt – In a Nutshell as they compare the sizes of stars, starting with things that would like the be stars. The review includes brown dwarfs, red dwarfs, red giants, hypergiants, and Stephenson 2-18 (St2-18), also known as Stephenson 2 DFK 1 or RSGC2-18…
“…one of the most luminous red supergiants, with an estimated radius around 2,150 times that of the Sun (R☉), which corresponds to a volume around 10 billion times bigger than the Sun. If placed at the center of the Solar System, its photosphere would engulf the orbit of Saturn.”
Surpassing UY Scuti, St2-18 is now considered to be the largest star in the known universe.
Watch more videos from Kurzgesagt and more videos about the sun, stars, astronomy, and the sizes of things, including:
• Everything You Need to Know About Planet Earth
• The Beginning of Everything – The Big Bang
• Planet and star size comparisons from smaller to larger
• MinutePhysics asks: How Big Is The Sun?
• How Small Is An Atom?
• Building the solar system to scale in the Nevada desert
• If the Moon were replaced with some of our planets…
And as always, Charles and Ray Eames’ Powers of Ten (1977).