Here's why:

* Blue color: Its spectral classification is B8, which means it emits a blueish-white light. This is typical of hot, massive stars.

* Supergiant size: Muliphein is significantly larger and more luminous than our Sun. It is about 60 times the mass of the Sun and 50,000 times more luminous.

* Life cycle: Blue supergiants are relatively short-lived stars that are in the latter stages of their evolution. They eventually explode as supernovae.

So, Muliphein is a massive, hot, and luminous blue supergiant star.