VV Cephei is actually a binary star system, meaning it consists of two stars orbiting each other. Determining the "size" of such a system is a bit tricky, as it depends on what you mean by "size":

* Individual Star Size:

* VV Cephei A (the red supergiant): It's the larger of the two. Its radius is estimated to be about 1,050 times the radius of the Sun, making it one of the largest known stars.

* VV Cephei B (the blue companion star): It's significantly smaller, with a radius estimated to be about 10-15 times the radius of the Sun.

* Orbital Separation: The two stars are separated by a vast distance, estimated to be about 17.6 astronomical units (AU), which is roughly the distance between the Sun and Uranus.

Therefore, the size of the VV Cephei system can be understood as the combined size of its two stars (1,050 times the Sun's radius for VV Cephei A and 10-15 times for VV Cephei B) plus the distance separating them (17.6 AU).

It's worth noting that the actual size of VV Cephei A is still somewhat debated, with some estimates putting it closer to 1,600 times the Sun's radius.