Transcript THE EXPANDING UNIVERSE - Santee School District

CH 15 SEC 5
GOAL/PURPOSE
 YOU LEARNED THAT GALAXIES ARE CLUSTERS OF
BILLIONS OF STARS
 YOU WILL NOW LEARN THE ROLE OF GRAVITY IN
FORMING AND MAINTAINING THE SHAPE OF
OUR SOLAR SYSTEM
 YOU WILL ALSO LEARN ABOUT THE BIG BANG
THEORY AND HOW THE UNIVERSE HAS
CHANGED OVER TIME
THE BIG BANG
 BIG BANG- THE PERIOD WHEN THE UNIVERSE
BEGAN.
 KEY- ACCORDING TO THE BIG BANG THEORY, THE
UNIVERSE FORMED IN AN INSTANT BILLIONS OF
YEARS AGO, IN AN ENORMOUS EXPLOSION.
 KEY- SINCE THE BIG BANG, THE SIZE OF THE
UNIVERSE HAS BEEN INCREASING RAPIDLY AND IS
BILLIONS OF TIMES LARGER THAN IT WAS IN IT’S
EARLY HISTORY
HUBBLE
 KEY- IN THE 1920’S AN AMERICAN ASTRONOMER ,
EDWIN HUBBLE, HELPED DEVELOP THE BIG
BANG THEORY
 HUBBLE’S LAW- STATES THAT THE FARTHER
AWAY A GALAXY IS, THE FASTER IT IS MOVING
AWAY FROM US.
 KEY- THE HUBBLE TELESCOPE WAS NAMED
AFTER HIM
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EXPANDING
 KEY- THE UNIVERSE IS EXPANDING LIKE RISING
BREAD DOUGH
 KEY- BASED ON CAREFUL MEASUREMENTS OF
HOW FAST DISTANT GALAXIES ARE MOVING
AWAY FROM US AND THE COSMIC
BACKGROUND RADIATION, ASTRONOMERS
ESTIMATE THAT THE UNIVERSE IS ABOUT 13.7
BILLION YEARS OLD
FORMATION OF SOLAR SYSTEM
 1. A CLOUD OF GAS AND DUST FORMED A
SPINNING DISC
 2. GAS IN THE CENTER OF THE DISC COLLAPSED
TO FORM THE SUN
 3. THE REMAINING GAS AND DUST FORMED THE
PLANETS
 4. THE SOLAR SYSTEM INCLUDES THE SUN,
PLANETS, AND BELTS OF ROCK, ICE AND DUST
 http://www.brainpop.com/science/space/
Milky Way Spiral Galaxy
THE FUTURE
 KEY- NEW INFORMATION AND OBSERVATIONS
LEAD MANY ASTRONOMERS TO CONCLUDE THAT
THE UNIVERSE WILL LIKELY EXPAND
………………………………….
 http://www.youtube.com/watch?v=r0H6R7xRytk
 FOOOOOOORRRRRRRRRREEEEEEEEEEEEEEEEEV
VVVVVVVVVVVVVVVVEEEEEEEEEEEEEEEEEEEER
RRRRRRRRRRRRRRRRRRRRRRRRRRRRR
DARK MATTER AND ENERGY
 DARK MATTER- IS THE MATTER THAT DOES NOT GIVE OFF ANY

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

ELECTROMAGNETIC RADIATION.
KEY- DARK MATTER CANNOT BE DETECTED DIRECTLY.
KEY- ITS PRESENCE CAN BE INFERRED BY OBSERVING THE EFFECT OF
ITS GRAVITY ON VISIBLE OBJECTS SUCH AS STARS OR ON LIGHT.
DARK ENERGY- IS CAUSING THE UNIVERSE EXPANSION TO
ACCELERATE
KEY- MOST ASTRONOMERS THINK THAT THE UNIVERSE IS MADE UP OF
MOSTLY DARK MATTER AND ENERGY
 http://www.brainpop.com/science/space/darkmatter/
CHECK FOR UNDERSTANDING
WRITE THE Q & A
 WHAT IS THE BIG BANG THEORY?
 WHEN DID THE BIG BANG OCCUR? WHAT
EVIDENCE IS THERE TO SUPPORT THE THEORY?
 HOW OLD IS THE SOLAR SYSTEM?
 WHAT IS DARK MATTER?
 WHAT EVIDENCE HAS LED SCIENTIST TO
PREDICT THAT THE UNIVERSE WILL EXPAND
FOOOOOORRRREEEEEEEVERRRR?