Black Hole Closer to Earth Than Thought

Astronomers have accurately measured the distance between Earth and a particular black hole for the first time. And wow, is it close.
The researchers determined that the black hole V404 Cygni is located 7,800 light-years from Earth — or just slightly more than half the distance that was previously assumed.
That puts it relatively nearby to Earth, where the distance to the center of the galaxy is about 26,000 light-years, and the nearest star beyond the sun is a mere 4.2 light-years away.

Full article on Space.com