By 2013 the we could find out whether gravity from blackholes eating matter can produced graviton waves.
The upside of the Lisa
project is that it is a cooperation between Nasa and the European Space Agency. But could the project also be capable of finding more than just that which it was designed to do? Are there other forms of waves that travel trough space at extremely long wave lengths? Could there be other forms of waves or EMR that we cannot yet detect?