What is the largest known star; Is a frequent question and until now considered that VY Canis Majoris is. However, recent data suggest that this star is smaller than previously thought. The new beast of heaven is the NML Cygni otherwise known as V1489 Cygni. This large star has a radius of about 1,650 times that of the Sun – numbers that are really hard to imagine in size comparison. This video starts with our solar system and compares it with the star Betelgeuse and then with the NML Cygni.