Black Holes

http://en.wikipedia.org/wiki/Black_hole
http://scienceblogs.com/startswithabang/2012/05/10/why-youll-never-escape-from-a/

 http://www.universetoday.com/23152/the-milky-ways-black-hole/
http://www.howstuffworks.com/science-vs-myth/what-if/what-if-black-hole-formed-near-solar-system.htm
http://punchbaby.com/2012/04/michio-kaku-a-black-hole-in-our-own-backyard/
http://fmslebanon.com/play/fQmSLZ8NZv0/Black_Holes_Discovered_20_Billion_times_the_Sun%2527s_Mass_%2528%2528_Michio_Kaku_%2529%2529.html
http://www.space.com/21638-giant-black-hole-dust-surprise.html