it depends on how you're using it. quasar sounds correct if it's a thing
A Quasar, solar flares, or galaxies exploding
Like any other noun relating to a space object. I looked into space using my telescope, and I saw a big swirly thing that turned out to be a quasar.
It is not.
To my knowledge the hottest thing in the average household is a tungsten filament incandescent light bulb
I would think it would either be a Hyper Nova or a Quasar
There is no such thing as vampires, they are a myth. So, there cannot be a hottest girl vampire in the world if there is no such thing as vampires.
No. Life cannot exist anywhere near a quasar. For one thing there is no "on" a quasar. A quasar consists of a disk of extremely hot matter falling into a supermassive black hole. What cannot cross the event horizon is ejected in jets at the poles at nearly the speed of light. The radiation of even a moderate quasar is more than 10 trillion times that of the sun. Even light years away any planet would be completely sterilized.
The hottest thing "in the world"? That lets out stars or anything else off-world, so probably the core of the Earth.
hottest thing since pepper chose la plus chaude depuis poivre
Leonardo DiCaprio
the sun