VY Canis Majoris

VY Canis Majoris (VY CMa) is a red hypergiant star in the constellation Canis Major.  It is about  distant from Earth. It is one of the biggest known stars in the universe, and one of the most luminous of its type. 

VY Canis Majoris is 1,420 times bigger than the Sun.Wittkowski M. et al 2012. Fundamental properties and atmospheric structure of the red supergiant VY CMa based on VLTI/AMBER spectro-interferometry. Astronomy & Astrophysics 540: L12.  If placed at the center of the Solar System (where the Sun is), VY Canis Majoris's surface would extend beyond Jupiter's orbit. However, there is some differences in the estimates of how big it is. Other estimates of the radius made it bigger than the orbit of Saturn or even as small as the asteroid belt, but these are highly unlikely.

VY CMa is a single star, a "semiregular" variable with a period of about 2,001 days. It has an average density of 5 to 10 mg/m3.

When it dies it is expected to explode to a Supernova and then turn into a Black hole.

 Related pages 
VV Cephei
NML Cygni
Mu Cephei
List of largest stars

 References 

Category:Red giants
Category:Variable stars
Category:Hypergiants