Pulsars, gravitational waves, clocks, planets, spacecraft and black holes

I will describe the aims and status of the Parkes Pulsar Timing Array project. I will present recent results that have identified irregularities in terrestrial time standards, determined the mass of the Jovian system, studied the interstellar medium and placed the most stringent constraint to date on the existence of gravitational waves from supermassive binary black hole systems. I will demonstrate that this constraint rules out some models for galaxy evolution. I will discuss future plans for our project and show how our data sets can be used for numerous other astrophysical purposes including studying methods to navigate spacecraft through the solar system.