The existence of gravitational radiation is one of the most elegant predictions of Einstein's theory of general relativity. Almost 100 years after the theory was put forward, however, the direct detection of these waves remains elusive. Scientists in the United States and around the world have now built exquisite instruments, such as Laser Interferometer Gravitational Wave Observatory (LIGO), sensitive enough to see gravitational waves from the cosmos. The first detection will usher in a new era of scientific discovery using gravitational waves as an astronomical tool to see black holes, neutron stars, and signals from the beginning of the universe. Brady will discuss the technical challenges of this endeavor, what has been achieved so far, and the prospects for gravitational-wave astronomy over the next decade.
