This stunning image by the Hubble Space Telescope shows the central region of the Tarantula Nebula in the Large Magellanic Cloud (Picture of the Month, CERN Courier June 2012 p12). The young dense star cluster R136 is only a few million years old, and contains hundreds of young blue stars. In addition to this image by the Wide Field Camera 3, astronomers used the ultraviolet-imaging spectrograph STIS – installed by astronauts in 2009 – to identify nine monster stars with masses more than 100 times that of the Sun. One of them is the previously identified record-holder R136a1, which keeps its place as the most massive star known in the universe, at more than 250 solar masses. These hefty stars are destined to explode as supernovas in a few million years.