How is this strand of spider web created?

There is a spider in my bedroom that creates a single strand of web from one point in the room to another, it’s around 1.5 metres long and 1 metre down from the ceiling. I have absolutely no idea how a spider can create this single strand, how does it support itself? For those using imperial measurements 1.5 metres is about 4’ 6 “or thereabouts. I would love an answer to this, then again I guess I also enjoy the mystery.