My favourite bit from today’s Astronet sessions … The Square Kilometre Array (SKA) guys say they will find 30,000 pulsars , and 1000 of these will be millisecond pulsars. So we will have a network of these beasts spread through the Galaxy, and will know their frequencies and phases very accurately. Then … here comes the cool bit …. as gravitational waves pass through the Galaxy, and temporarily alter the path lengths to different parts of this network, we will see phase shifts. So we will be using the whole Galaxy as a gravitational wave detector. Its as sensitive as LISA but sensitive to higher frequencies.
How cool is that.