Milky Way Much Smaller Than Believed

    • admin@nie.com
    • Publish Date: May 20 2016 3:03PM
    • |
    • Updated Date: May 27 2016 9:05PM
Milky Way Much Smaller Than Believed

Until a few years back, the Milky Way was believed to have a mass three trillion times bigger than that of the sun. But a recent study reveals that it has half the mass of the neighbouring Andromeda galaxy which has a similar structure to our own. The Milky Way and Andromeda are the two largest in a region of galaxies that astronomers call the Local Group. 

Extra weight: Scientists say the extra weight of Andromeda may be due to the existence of elusive dark matter, a little understood invisible substance which makes up most of the outer regions of galaxies.  They estimate that Andromeda contains twice as much dark matter as the Milky Way, causing it to be twice as heavy. Although both galaxies appear to be of similar dimension, until now scientists had been unable to prove which is larger. 

Key facts

  • The Milky Way is believed to be 120,000 light years away and contains more than 200 billion stars. 
  • This makes it a ‘middleweight’ galaxy — the largest galaxy known, IC 1101, contains more than 100 trillion stars. 
  • It is spiral in shape, like most of the known galaxies in the universe.

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