A galaxy is made of billions of stars, dust and gas all held together by gravity
Galaxies are scattered throughout the universe and they are vary in size
Galaxies can be classified according to their appearance and shape.
Spiral
Spiral galaxies usually is shaped like a disk that tends to
resemble a whirlpool or pinwheel
It contains a lot of dark dust clouds and young star cluster
Elliptical
Elliptical galaxies are actually of ellipsoidal shape
Normally, elliptical galaxies contain very little gas, dust and older stars
Irregular
Irregular galaxies has an undefined shape
It is full of dust, gas and young star
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