Not only did Einstein's theory reshape astrophysics, but it also gave birth to the field of cosmology, the study of the evolution of the Universe. Cosmology is another exciting area of research with new data coming in from the Plank satellite that show the earliest images of our Universe's birth. Such data and future, planned experiments will allow us to determine the fundamental properties of the cosmic microwave background to unprecedented levels. Gravitational wave detectors themselves might also be able to provide cosmological information through the detection of stochastic backgrounds.