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Universe
ALL space and everything that is in it.
Supercluster
Virgo
Our Cluster
or Galaxy Group
Local Group
Galaxy
A giant structure that contains
hundreds of billions of stars bound
together by gravity.
Types of Galaxies
• Galaxies are classified by their shape.
• Edwin Hubble~ astronomer named for the
Hubble Telescope created a galaxy
classification system
• The classification system is still used today.
• 3 Types of Galaxies
– A. Spiral
– B. Elliptical
– C. Irregular
Spiral Galaxy
A galaxy whose arms curve outward in
a pinwheel pattern. Contains solar
systems and nebulae
(gas, new stars, and dust).
Our Galaxy:
MILKY WAY
Spiral Galaxy
Elliptical Galaxy
A galaxy shaped like a flattened ball,
containing only old stars, with
bright centers and very little
dust/gas
Example: M87 galaxy
Elliptical Galaxies
Irregular Galaxy
A galaxy that does not have a regular
shape. They do not fit in another
class.
Example: The Large Magellanic
Cloud
Irregular Galaxy
Solar System
Our star (Sun), the planets, many
moons, and other small bodies that
ALL travel around the Sun
(Heliocentric Theory)
Solar System