Galaxy Notes

 

          A galaxy is a collection of _________.  Our galaxy is called the _________ _______.  There are approximately _____________ stars in our galaxy.  Our galaxy has a diameter of about _____________. Its thickest point is about ______________ and is located at the __________ ________.

 

The Universe consists of organized groups of galaxies called __________. The Milky Way belongs to a cluster called the Local Group. 

 

The closest galaxies are the ____________ __________.  They are about ___________ light years away. However these galaxies are small and _____________.  In 1994, an even closer galaxy was discovered – The Sagittarius Dwarf Elliptical Galaxy, it is _____________ light years away.  The closest spiral galaxy is the _____________ __________.  It is about ________________ light years away. 

         

There are three types of galaxies; ____________, ______________, _____________.

 

Spiral galaxy:

 

Elliptical galaxy:

 

Irregular galaxy:

___________ Galaxy: one in which more energy is emitted than the sum of energy emitted from all its stars.

Believed to have a supermassive ________ ________in the center - energy or radiation (gamma rays, x-rays, UV, etc.) is emitted at the poles as the matter being pulled into it is ripped apart.

___________: brightest object in space - believed to be an extremely active galactic nuclei that outshines all the stars in its galaxy. 100 to 1000 times brighter than a normal galaxy.

They are always very distant. What does this suggest?

___________: A quasar or active galaxy with its jets pointing toward earth.