LISA Pathfinder 'listens' to the universe while in freefall
 

Back in December, the European Space Agency (ESA) launched the Laser Interferometer Space Antenna (LISA) Pathfinder spacecraft. Today, it's finally positioned itself in gravitational stasis at the first Langrangian Point (L1) that lets its instrument...

http://www.engadget.com/2016/06/07/l...e-in-freefall/