How big can the stars in the universe be?

While dwarf stars are only about as big as a planet, other supergiant stars may be 1,400 times larger than the Sun. For example, super-giant Vy Canis Majoris has a diameter of up to 2 billion km.

Which star lives the longest, brightest, biggest, ... in the universe?
Why are the stars in the universe spherical and not square or rectangular?

Stars in the universe are very different in size. While dwarf stars are only about as big as a planet, other supergiant stars may be 1,400 times larger than the Sun. For example, super-giant Vy Canis Majoris has a diameter of up to 2 billion km.

The brightest man-made star in the night is about to enter the universe in July
Which star lives the longest, brightest, biggest, . in the universe?

Kareem Winters

Update 24 May 2019

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