VY Canis Majoris has a diameter of almost 2 billion kilometers. (Compare that to the sun's relatively measly 1.4 million!) It's located about 5,000 light-years from Earth, and used to be the largest star known to science. Today, however, scientists believe that UY Scuti might hold that title, boasting a diameter of around 2.4 billion kilometers.
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Key Facts In This Video
The sun makes up as much as 99.8% of the total mass of our solar system. 00:45
It would take an airplane around 700–1,100 years to completely circle the star VY Canis Majoris. 01:28
UY Scuti, perhaps the largest star ever discovered, is estimated to have a volume 5 billion times that of the sun. 02:00