Very, very unlikely. But still just barely possible:

Astronomers Are Intrigued by This Weird ‘String’ at The Centre of Our Galaxy

It seems to be attached to, or at least associated with, Sagittarius A*, the 4-million-solar-mass black hole at the center of the galaxy. Sadly, the scale of the thing isn’t presented, but given the distance to the center of the galaxy it’s safe to assume that this structure is several light years in length.