Astronomers have located an ongoing galactic merger, pinpointing the exact location of each galaxy's supermassive black hole. These twin monsters are swirling around each other, and in several million years, they'll merge together, releasing a powerful blast of gravitational radiation. ...

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300 million Light years away.
Will merge in 10 to 100 million years.
Lets see now. Doesn't that mean that they have already merged somewhere between 200
and 290 million years ago. We just have not seen the LIGHT from that event yet. How fast
do gravity waves travel? 1. Instantaneously? I think we already missed seeing the gravity
waves. 2. At the speed of light? Well then we have some time left to learn how to detect them.

Ray

Gravity and gravity waves at light speed. Instantaneous gravity propagation leads to problems with celestial mechanics. I think it's covered in the Wiki article.

After i posted some comments last night about not being able to mesure black holes. i did some resurch and i think im starting to figure it out. But still not sure yet