Frae Wikipedia, the free beuk o knawledge
Comparison o a blue hypergiant, yellae hypergiant, reid supergiant, an reid hypergiant superimposed on an ootline o oor solar seestem. The blue hauf-ring centred near the left edge represents the orbit o Neptune.

A hypergiant (luminosity class 0) is a starn wi an enormous mass an luminosity, shawin signs o a very heich rate o mass loss.