R136a1: Most Massive and Most Luminous Star (Fact of the Day)

From Left: a red dwarf, the Sun, a blue dwarf and the R136a1
R136a1 is a blue hypergiant star of R136, a super star cluster in the Large  Megallanic Cloud. It is estimated to be 265 solar masses making it the most massive star but not the largest. The largest star being VY Canis Majoris. R136a1 is also the most luminous star known, with a luminosity of 8,700,000 times the luminosity of the Sun. The surface temperature of the star is about 50,000 K.

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