Can you sing in gravitational waves?. I bet you can't - that's why the universe is better than you. Some folks, namely Craig Hogan of the University of Washington want to use the Laser Interferometer Gravitational Wave Observatory or NASA’s proposed Laser Interferometer Space Antenna to detect fluctuations in gravitational waves caused by galaxy sized, vibrating loops of energy. These giant loops are a theoretically possible according to one String Theory. The loops are narrow tubes of energy stretched across vast distances by the expansion of the universe.