RMC136a (more often nicknamed R136)
Most massive stars in Universe discovered - BBC News
Using the European Southern Observatory's Very Large Telescope, they found one which at birth had more than 300 times the mass of the Sun and is 10 million times more luminous.
This video shows R136, a cluster of young, massive and hot stars located inside the Tarantula Nebula, in one of the Milky Way's neighbouring galaxies, the Large Magellanic Cloud.
The study is published in the journal Monthly Notices of the Royal Astronomical Society."
http://www.bbc.co.uk/news/science-environment-10701815
Astronomers detect 'monster star' BBC News - By Jonathan Amos
http://www.bbc.co.uk/news/science-environment-10707416
ESO - eso1030 - Stars Just Got Bigger
http://www.eso.org/public/news/eso1030/
Biggest star ever found may be ticking antimatter bomb -New Scientist
http://www.newscientist.com/article/dn19201-biggest-star-ever-found-may-be-ticking-antimatter-bomb.html?DCMP=OTC-rss&nsref=space
Astronomers Find Most Massive Stars To Date - Space News - redOrbit
http://www.redorbit.com/news/space/1894306/astronomers_find_most_massive_stars_to_date/index.html
Stars just got bigger: A 300-solar-mass star uncovered
http://www.sciencedaily.com/releases/2010/07/100721085352.htm
Scientists find most massive star ever discovered (w/ Video)
http://www.physorg.com/news198924098.html
Most Massive Star Discovered―Shatters Record
http://news.nationalgeographic.com/news/2010/07/100721-science-space-most-massive-star-ever-discovered-record/
太陽の約300倍の質量を持つモンスター級の星
http://www.astroarts.co.jp/news/2010/07/27massive-stars/index-j.shtml
太陽の265倍という史上最大の重さを持つ星
http://www.planetary.or.jp/HotTopics/topics100728_1.htm