The Big Bang Theory PowerPoint
Transcript The Big Bang Theory PowerPoint
THE BIG BANG THEORY
STATES THAT THE UNIVERSE
BEGAN AS A SINGLE COSMIC
EXPLOSION ABOUT 15 BILLION
In 1964, Penzias and
Wilson discovered the
remnant heat of the Big
Bang. This is called
background radiation. It
is all around us.
The radiation corresponds
to a temperature of 3
degrees above absolute zero
(- 454 F).
An animal, or a
human body, for
radiation that can
be detected by an
The COBE Satellite
(Cosmic Background explorer)
Before correction of the
Earth movement around the
Before correction of the
microwave radiation emitted
by our own galaxy
The final image of the
Energy left over from the Big Bang
that is evenly spread out
throughout the universe.
This background radiation is one
observation that supports the Big Bang
And then a better picture!
satellite gave a
So, the big-bang must have taken place
at the same time everywhere.
But we can also observe small
fluctuations of temperature which may
have lead to the formation of the
Small fluctuations compared to those at the
surface of the Earth
After the Big Bang
Gravity began to affect matter racing
in every direction.
The clumps formed into huge clusters
These clumps became the galaxies of
The Race is On!!
Every galaxy seems to be moving away
After examining the Red Shift that appears
from distant galaxies astronomers conclude
the universe is expanding at tremendous
What is red shift?
In order to understand Red
Shift we must first look at the
The Doppler Effect
Whenever a source of sound is moving, the pitch you hear depends on whether the sound source
is moving towards you or away from you.
Light Travels in the same way:
As objects move towards the Earth they emit a Blue
light called the Blue Shift.
As objects move away from the Earth they emit a Red
Light called the Red Shift.
This was seen using the Hubble Telescope.
Distance between Stars
Fortunately for us, the average
between stars is about 3 light years or 20
If stars were 10 times closer (~2 trillion miles), a nearby
star could pull the earth into an eccentric orbit and kill
If the stars were much farther apart, then there would
not be enough heavy elements to make life. Heavy
elements (like carbon and oxygen) are
the ashes of dead stars and living things
(including us) need these elements.
If the universe is expanding, then
the objects near the very edge of
the universe are the oldest objects
in the universe.
The most distant known objects in
the universe are over 12 billion
light years from the Earth
Three Pieces of Evidence Supporting the Big
The presence of Background
The observation of the galaxies
spreading away from the center of
the universe (Red Shift)
What Happens Next?
Astronomers feel that the Big
Bang theory leads to two
possible futures for the
Galaxies will continue racing outward
(continue to expand). All of the stars
will die off as the last of their energy is
released. There will be nothing left,
Gravitational attraction between the
galaxies will cause the movement
away from each other to slow and,
eventually come to a halt.
The gravitational pull will begin to
pull the galaxies back to the center of
Closed Universe cont.
All of the matter and energy will again
come close together and end in a
central area (possibly no larger than a
Then another Big Bang will occur and
the formation of the universe will
begin all over again.
Um… I think we may have been here before?
This restructuring may occur once
every 80 to 100 billion years.