An animation by the Max Planck Institute for Gravitational Physics regarding the LISA (Laser Interferometer Space Antenns) project due for launch around 2018. Source- www.aei.mpg.de more info- lisa.jpl.nasa.gov 'LISA is intended to measure gravitational waves by using laser interferometry over astronomical distances. It will use three spacecraft arranged in an equilateral triangle to form a giant Michelson interferometer with arms about 5 million kilometers long. When a gravitational wave disturbs the space-time field between two of the spacecraft, small differences in the relative lengths of the arms should be measurable.'