An unseen object—probably a black hole—orbits with two normal stars in our cosmic neighborhood.

MORE: eos.org/articles/the-closest-black-hole-is-1000-light-years-away#:~:text=Rivinius%20and%20his%20collaborators%20estimated%20that%20the%20black,implies%20that%20systems%20like%20this%20one%20are%20common.