Transcript CH 15 SEC 4 STAR SYSTEMS AND GALAXIES

GOAL/PURPOSE
• STUDENTS WILL LEARN THAT
GALAXIES ARE CLUSTERS OF
BILLIONS OF STARS AND THAT THE
SUN IS ONE OF MANY STARS IN THE
MILKY WAY GALAXY. THEY WILL
ALSO LEARN THAT GALAXIES ARE
CLASSIFIED ACCORDING TO SIZE
AND SHAPE.
CLUSTERS
 KEY-STARS ARE NOT EVENLY DISTRIBUTED
THROUGHOUT THE GALAXY
 KEY- MANY STARS BELONG TO STAR CLUSTERS, WHICH
ARE LARGE GROUPS OF STARS THAT FORM AROUND
THE SAME TIME
 KEY- OPEN CLUSTERS ARE LOOSE AND DISORGANIZED
 GLOBULAR CLUSTERS- ARE ROUND AND DENSELY
PACKED
GALAXIES
 GALAXY- IS A LARGE GROUP OF STARS, STAR SYSTEMS,
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STAR CLUSTERS, DUST AND GAS BOUND TOGETHER BY
GRAVITY.
KEY- MANY LARGE GALAXIES, INCLUDING OUR OWN
APPEAR TO HAVE HUGE BLACK HOLES AT THE CENTER.
KEY- THERE ARE BILLIONS OF GALAXIES IN THE
UNIVERSE
KEY- EACH GALAXY CONTAINS BILLIONS OF STARS AND
THE LARGER ONES TRILLIONS OF STARS.
KEY- SCIENTIST ARE DISCOVERING MORE EARTHLIKE
PLANETS ALL THE TIME.
KEY ASTRONOMERS CLASSIFY GALAXIES INTO THREE MAIN
CATEGORIES SPIRAL LIKE THE ONE BELOW AND LIKE OUR MILKY
WAY.
SPIRAL GALAXIES- HAVE A DENSE CENTER AND ARM THAT
SPIRAL OUTWARD AND ROTATE AROUND THE MIDDLE.
Elliptical galaxies- have a rounded shape or oval , or egg like. Contains very
old stars.
Irregular galaxies- no regular shape, typically
smaller than other types
Milky way- our solar system is located in the spiral galaxy called the milky way galaxy
Milky Way Spiral Galaxy
UNIVERSE
 KEY- ASTRONOMERS DEFINE THE UNIVERSE AS ALL
OF SPACE AND EVERYTHING IN IT.
 KEY- THE UNIVERSE IS ENORMOUS ALMOST
BEYOND IMAGINATION.
 KEY ASTRONOMERS STUDY OBJECTS AS CLOSE AS
THE MOON AND AS FAR AWAY AS QUASARS
 QUASARS- ARE THE MOST DISTANT OBJECTS IN THE
UNIVERSE THOUGHT TO BE ACTIVE YOUNGER
GALAXIES WITH GIANT BLACK HOLES IN THE
CENTER
 KEY- ASTRONOMERS STUDY OBJECTS
INCREDIBLY LARGE, SUCH AS GALAXIES THAT
ARE MILLIONS OF LIGHT YEARS ACROSS.
 KEY- THEY ALSO MAY STUDY BEHAVIOR OF TINY
PARTICLES, SUCH AS ATOMS WITHIN STARS
CHECK FOR UNDERSTANDING- WRITE THE QUESTION AND
ANSWER
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1. Name the main types of galaxies
2. What type of galaxy is the milky way?
3. What type of galaxy contains older stars?
4. How far away is it to the center of our galaxy?
5. What is a light year and how fast does light travel?
6. What is the fastest moving man made object, what is
speed of sound?
 7. List 3 reasons why space travel so challenging for
humans?
brainpop
 http://www.brainpop.com/science/space/
 https://www.brainpop.com/science/space/milkyway/
 https://www.brainpop.com/science/space/aliens/
 https://www.brainpop.com/science/space/galaxies/