Along with a group of people from Rose City Astronomers, I visited the LIGO (Laser Interferometry Gravitational-Wave Observatory) facility in Hanford, WA last weekend.  The impressive looking structure in the above photo is actually just a water tank (mainly in case of a fire), but has the best LIGO signage on the site – the LIGO logo, if you like. I’ve written about LIGO and gravitational waves here before, but in case you missed it, here’s a quick summary:  Gravitational waves are distortions of time-space caused by the movement of mass through space.  Their existence was predicted by Albert Einstein […]