powerpoint over galaxies, stars and nebulas

1. Galaxy DGalaxy A Galaxy B Galaxy C
1. Name these galaxies according to their shape.
2. Galaxies that travel together through space are called –
A constellations
B solar systems
C Milky Ways
D Clusters
3. What do all galaxies have in common?
A They are the same shape.
B They are made of stars.
C They are the same distance from Earth.
D They travel around the Sun.
Bell Ringer 4.6 2/22/11Bell Ringer 4.6 2/22/11
copy questions 2 and 3 with the answercopy questions 2 and 3 with the answer
choiceschoices

2. Galaxy DGalaxy A Galaxy B Galaxy C
1. Name these galaxies according to their shape.
2. Galaxies that travel together through space are called –
A constellations
B solar systems
C Milky Ways
D Clusters
3. What do all galaxies have in common?
A They are the same shape.
B They are made of stars.
C They are the same distance from Earth.
D They travel around the Sun.
Spiral Elliptical Irregular Spiral

3. September 24, 2007September 24, 2007
1.1. Bell RingerBell Ringer
2.2. Turn in “KWL” / Red Shift ActivityTurn in “KWL” / Red Shift Activity
3.3. Complete Galaxy FoldableComplete Galaxy Foldable
4.4. Galaxy/Light-year NotesGalaxy/Light-year Notes

4. Today’s ObjectivesToday’s Objectives
 To be able to differentiate between theTo be able to differentiate between the
three types of galaxies.three types of galaxies.
 To understand the use of light-years andTo understand the use of light-years and
be able to apply the measurement to starsbe able to apply the measurement to stars
and galaxies.and galaxies.

5. GalaxiesGalaxies
 Galaxies are made up of billions andGalaxies are made up of billions and
billions ofbillions of

6. GalaxiesGalaxies
 Galaxies are made up of billions andGalaxies are made up of billions and
billions ofbillions of starsstars..

7. GalaxiesGalaxies
 Galaxies are made up of billions andGalaxies are made up of billions and
billions ofbillions of starsstars..
 Many galaxies make upMany galaxies make up

8. GalaxiesGalaxies
 Galaxies are made up of billions andGalaxies are made up of billions and
billions ofbillions of starsstars..
 Many galaxies make upMany galaxies make up clusters.clusters.

9. GalaxiesGalaxies
 Galaxies are made up of billions andGalaxies are made up of billions and
billions ofbillions of starsstars..
 Many galaxies make upMany galaxies make up clusters.clusters.
What is the name of our galaxy???What is the name of our galaxy???

10. The Milky Way!!!!The Milky Way!!!!

11. The Milky Way!!!!The Milky Way!!!!
 The Milky Way is Located the cluster ofThe Milky Way is Located the cluster of
galaxies called thegalaxies called the

12. The Milky Way!!!!The Milky Way!!!!
 The Milky Way is Located the cluster ofThe Milky Way is Located the cluster of
galaxies called thegalaxies called the Local GroupLocal Group..

13. 3 Types of Galaxies3 Types of Galaxies

14. Galaxy DGalaxy A Galaxy B Galaxy C
3 Types of Galaxies3 Types of Galaxies

15. Galaxy DGalaxy A Galaxy B Galaxy C
3 Types of Galaxies3 Types of Galaxies
Spiral Elliptical Irregular Spiral

16. What shape is our galaxy?What shape is our galaxy?

17. What unit do astronomers use to measureWhat unit do astronomers use to measure
the distances between stars and galaxies?the distances between stars and galaxies?

18. What unit do astronomers use to measureWhat unit do astronomers use to measure
the distances between stars and galaxies?the distances between stars and galaxies?
Light-YearsLight-Years

19. What unit do astronomers use to measureWhat unit do astronomers use to measure
the distances between stars and galaxies?the distances between stars and galaxies?
Light-YearsLight-Years
A light-year is the distance that light travelsA light-year is the distance that light travels
in one year.in one year.

20. What unit do astronomers use to measureWhat unit do astronomers use to measure
the distances between stars and galaxies?the distances between stars and galaxies?
Light-YearsLight-Years
A light-year is the distance that light travelsA light-year is the distance that light travels
in one year.in one year.
Light travels at 300,000 kilometers in one second! Think of how far lightLight travels at 300,000 kilometers in one second! Think of how far light
can travel in one year…can travel in one year…

21. 9.5 trillion kilometers!!9.5 trillion kilometers!!

22. Light-Years Away???Light-Years Away???
 Light-year is a measure of distance…notLight-year is a measure of distance…not
time!!time!!
 Proxima Centauri is the closest star toProxima Centauri is the closest star to
Earth other than the Sun. This star is 4.3Earth other than the Sun. This star is 4.3
light years away.light years away.
 Therefore, it takes 4.3 years for the lightTherefore, it takes 4.3 years for the light
from that star to reach Earth.from that star to reach Earth.

23. So…So…
 If a star that is located 65 light years awayIf a star that is located 65 light years away
from Earth burns out at this very moment,from Earth burns out at this very moment,
how long will it be before we know it?how long will it be before we know it?

24. So…So…
 If a star that is located 65 light years awayIf a star that is located 65 light years away
from Earth burns out at this very moment,from Earth burns out at this very moment,
how long will it be before we know it?how long will it be before we know it?
Yep!!!Yep!!! 65 Years65 Years