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The most massive stars out in the space are termed as Super giants or Supergiant stars . Are you eager to know more about Supergiants? Read this article to know more about these stars. Super-giants  – the super massive stars have masses varying from 10 to 70 solar masses or even more and brightness ranging from thirty thousands to many hundreds of thousands times the solar luminosity. Their radii may vary from thirty to five hundred or as more as one thousand plus solar radii. They are of short lifespan of only ten to fifty millions years because of their extreme masses. They are observed in young cosmic structures (the spiral galaxies’ arms, open clusters and irregular galaxies etc). Some currently known Super-giants in terms of physical size, however, not the most massive stars in terms of mass or/and luminosity are: VV Cephei V354 Cephei KW Sagitarii KY Cygni The Garmet Star Mu Cephei  [Source: Wikipedia and WWW]

Ever wondered what are Red supergiants? What gives red supergiant red color? Read it here know some facts about the massive red giant stars. Stars become red  super-giant  during their helium burning phase that takes place after the hydrogen burning phase of stars of about ten solar masses or more.  They have comparatively very cool temperatures of about 3500 to 4500 K. The red super giant stars are the largest stars in terms of physical size, and are of K -M spectral type. While these are known are the largest stars with respect to their physical size, these are not the most massive stars in the universe. They have enormous radii and a luminosity class of I. Most of the red super giants have radius of 200 to 800 times the radius of our Sun. Presently, the four largest known red super giant stars in Milky Way galaxy are: Mu Cephei KW Sagitarii V354 Cephei KY Cygni All of these four giant stars have a radius nearly 1500 times th...