Here's why:

* Betelgeuse is a red supergiant, one of the largest stars visible to the naked eye.

* Polaris (also known as the North Star) is a yellow supergiant.

* Alpha Centauri is a binary star system with two main stars, both of which are smaller than our sun.

* Antares is a red supergiant, similar to Betelgeuse.

While Antares is also a supergiant, Betelgeuse is a more commonly known example and often used in discussions about supergiants.