Cosmic String
A long, heavy object from Quantum Field Theory or String Theory, which is very thin. They may have been created in the early life of the Universe, and would now stretch across the entire Universe. No cosmic string has ever been observed. They may or may not exist.
Explore
Four Areas of Science
Inspiration
Time writes no wrinkle
on thine azure brow,
Such as creation's dawn
beheld, thou rollest now.