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The Universe is believed to be
between 10 and 20 billion years old!
1
EARTH
• THIRD TERRESTRIAL
PLANET FROM THE SUN
• DIAMETER 12,756 KM
• 1 A.U. (152,000,000 KM )
FROM SUN
• EARTH
2
ASTRONOMICAL UNIT
• AVERAGE DISTANCE
FROM EARTH TO THE
SUN
• A.U.=150,000,000 km
• If the mean distance of Earth from the Sun
is 1 AU ("Astronomical Unit"), then that of
Venus is 0.723 AU, of Mercury 0.387 AU
and that of Mars is 1.524 AU.
3
MOON
• Earth Distance
356,000 to
407,000 km
• Equatorial
diameter 3476
km
• MOON
4
SOLAR SYSTEM
• THE SUN AND ALL THE
OBJECTS THAT TRAVEL
AROUND IT
• SUN, PLANETS, MOONS,
ASTEROIDS, COMETS
• SOLAR SYSTEM
5
SOLAR SYSTEM
6
SUN
4.6 billion
years old.
• The Sun is a
medium size
star known as
a yellow
dwarf.
• SUN
7
LIGHT YEAR
• DISTANCE LIGHT TRAVELS IN
A YEAR
• 63,000 A.U.
• The Crab supernova remnant is about 4,000
light-years away.
• The Milky Way Galaxy is about 150,000 lightyears across.
• The Andromeda Galaxy is 2.3 million lightyears away.
8
PROXIMA CENTAURI
Tiny Red Dwarf star
some 4.22 lightyears
away from us, third
member of the Alpha
Centauri triple system.
9
STAR CLUSTER
• A GREAT
MANY
STARS
CLUSTERED
TOGETHER
10
GALAXY
• STRUCTURE THAT
CONTAINS HUNDREDS
OF BILLIONS OF STARS
• A cluster of stars, dust, and gas held
together by gravity
• TYPES OF GALAXIES
11
MILKY WAY GALAXY
• 100,000 lightyears in
diameter
• SPIRAL
GALAXY
• 200 BILLION
STARS
12
OUR MILKY WAY GALAXY
13
LOCAL GROUP
• The Milky Way Galaxy
belongs to the Local Group,
a smaller group of 3 large
and over 30 small galaxies
14
NEBULA
• CLOUD OF
DUST AND
GAS IN
WHICH NEW
STARS ARE
BORN
15
ROTATION
• THE SPINNING MOTION
OF A PLANET ABOUT ITS
AXIS (DAY AND NIGHT)
• The Earth rotates about an imaginary
line that passes through the North and
South poles of the planet. This line is
called the axis of rotation.
16
REVOLUTION
• THE MOVEMENT
OF ONE OBJECT
AROUND
ANOTHER
• EARTH’S
REVOLUTION=1
YEAR
• ALSO CALLED
PLANETS ORBIT
17