The rare hypergiant star was one which shared similar characteristics with a supergiant star, but was a hundred times more massive than Sol. The theoretical lifespan of a hypergiant was one to two million years. Like its supergiant companions, a hypergiant star would go supernova when it exhausted its supply of fuel and gravity crushed the inert remains.
In 2153, Enterprise NX-01 was the first Earth starship to research a red hypergiant in a range closer than ten light years; it was nearly a billion kilometers in circumference and was not expected to go supernova for another one or two hundred years. Their hull reached a temperature of 1,100 degrees, making it unsafe to approach any closer to the hypergiant. (ENT: "Cogenitor")