What Happens When Two Galaxies Merge?

There's a particular signature we would expect to see in the pulses from pulsars. And what would happen is a predictable pattern in the way that the pulses arrive on earth. We're interested, iik, the beginnings of black holes coming together. These things have masses like ten million or sometimes billions of times the mass of our sun. It's hard to even get your mind around. I int tell you l bt an experiment that claims to maybe have seen some of these low frequency gravitational waves by using a palsar ray. But first, let's take another break.