NASA flies four satellites in 'tightest ever' formation
 

NASA is boasting that it's been able to fly four giant satellites around our home in the "tightest" formation ever attempted in space. The quartet of craft are just six miles apart, and comprise the Magnetospheric Multiscale Mission, a project to m...

http://www.engadget.com/2015/10/20/n...ite-formation/