# Gravitational Wave Astronomy [duplicate]

This year the LIGO experiments have found evidence of Gravitational waves. In their experiments two black holes merge and give rise to huge ripples in spacetime. Now after the discovery, every scientific seminar I attended on the subject says that this opened up a new era of Gravitational wave astronomy. My question: Astronomy is usually referred to the observational study of universe, galaxies and stars. Given the gravitational waves we detect are anyway very feeble, I was wondering how is it possible to infer anything related to the structures of universe from these waves?