The document discusses the Milky Way galaxy. It provides information about its shape, structure, and properties. The Milky Way is a spiral galaxy with a central bar and spiral arms extending outward from the center. It contains over 200 billion stars and has a diameter of over 90,000 light years.

1. MILKY WAY THE MAP
THE DEFINISION OF MILKY
SOLAR WAY
SYSTEM
THE SHAPE
OF THE
MILKY WAY
MARS
and
PLUTO

2. MILKY WAY DEFINISION
THE
SOLAR
SYSTEM
MILKY
WAY
DEFINISIO
N
THE MAP
OF MILKY
WAY

3. Common Name Alternative Name
Norma Arm 3 kiloparsec Arm
Scutum-Crux Arm Centaurus Arm
Sagittarius Arm Sagittarius-Carina Arm
Orion Arm Local Arm
Perseus Arm -
Cygnus Arm Outer Arm
THE
SOLAR
SYSTEM
MILKY
WAY
DEFINISI
ON
THE MAP
OF
MILKY
WAY
THE
SHAPE
OF THE
MILKY MARS
WAY and
PLUTO

4. The Shape of the Milky Way
Properties of the Milky Way
 Classification of the Galaxy SBbc
 Diameter of the Galaxy 9 x 104 light years
 Distance of the Sun from the 2.6 x 104 light years
centre
 Length of the central bar 2.5 x 104 light years
 Mass of the Galaxy 1 x 1012 solar masses
 Number of stars in the 200 billion
Galaxy
 Orbital period of Sun around 225 million years
the Galaxy THE
SOLAR MARS
 Thickness of the Galaxy at 2 x 102 light years SYSTEM and
the Sun PLUTO
MILKY
THE THE SHAPE
 Velocity of Sun around the 220 km/s WAY
MAP OF OF THE
DEFINISI
Galaxy MILKY MILKY
ON
WAY WAY

5. MARS AND PLUTO
THE
SOLAR
SYSTEM
MILKY
WAY
DEFINISIO
N
THE
MAP OF THE SHAPE
MILKY OF THE MARS
WAY MILKY and
WAY PLUTO