Sources:
http://www.nasa.gov/press/2014/march/nasas-hubble-telescope-witnesses-asteroids-mysterious-disintegration-1/#.UxlcFnU2Rud
http://news.discovery.com/space/asteroids-meteors-meteorites/hubble-witnesses-mysterious-breakup-of-asteroid-140306.htm#mkcpgn=fbdsc8
