SPACE FACTS

  SPACE 
-FACTS -
       
  WHIRLPOOL GALAXY FACTS 
  
The whirlpool Galaxy is a familiar one to stargazers and among the many close galaxy neighbors to our own MILKY WAY. Because of its shape, it was the first galaxy to be classified as a spiral by astronomers. Today,it interests astronomers due to its spiral structure and the interaction it appears to be having with its near neighbors, M51b.
WHIRLPOOL GALAXY PROFILE 
Designation:  M51a or NGC 5194
Type:    spiral       
Diameter:  60,000 ly         
  Distance:  23 Mly              
    Mass: 160 billion M
Constellation: Canes venatici       

FACTS ABOUT THE WHIRLPOOL GALAXY 
• The whirlpool Galaxy was first discovered in 1773 by Charles Messier, who was charting the skies looking for objects that might be confused with comets.

• In 1845, astronomer William parsons observed the galaxy pair with his telescope at Birr Castle, Ireland, and found the spiral structure of the whirlpool.

• The whirlpool and its companion, M51b have already passed by or through each other once as they dance through a cosmic merger. The smaller galaxy has been severely disrupted by the encounter, and the whirlpool's spiral arms are distorted.

• The whirlpool Galaxy is undergoing huge bursts of starbirth due to its ongoing encounter with its smaller companion galaxy.

• The whirlpool, like many other galaxies, has a supermassive black hole at its heart, surrounded by rings of dust. The core of the galaxy is quite quite active - making the Whirlpool what astronomers call a "seyfert galaxy".

• The whirlpool's companion called M51b, is a dwarf galaxy. Because it is being torn apart by the ongoing interaction, it cannot be easily classified.  Its current appearance makes it look like an irregular galaxy.

• A bridge of gas and dust ties the two galaxies together as they merge.

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