1. Bell Ringer
1 – Take out your notebook
2 – Take out a new sheet of paper, put your name on it, and title it “Bell Ringers”
3 – Complete Bell Ringer Slip

2. Structure of the Universe (Pg 29)

3. Essential Question:
*What makes up the Universe?

4. Part 1 - What is the Universe?
Universe - Space and all of the matter (stuff) and energy that is in it.

5. What is the Universe?
*Includes galaxies, stars, solar systems, planets, other objects (moons, comets, asteroids, meteoroids), dust, gases

6. UNIVERSE
GALAXY
STAR
SOLAR SYSTEM
PLANET

7. *Galaxy – a massive system of stars, gases, dust, and other matter held together by a central gravitational force

8. *There are billions of galaxies in the Universe
*Each galaxy contains billions of stars

9. A) Spiral Galaxy – Circular with spiral arms
*The Milky Way Galaxy is spiral

10. B) Elliptical Galaxy – oval-shaped

11. C) Irregular Galaxy – no regular shape (blotch)

12. *Stars – large spherical (round) bodies composed of gases and gives off light
The Sun
Sirius
Polaris
Betelgeuse
Aldebaran

13. *Solar System – a central star with planets and other small objects orbiting it

14. *Planet – a spherical body that orbits a star

15. Gases and Dust (Nebula)
Other types of Matter:
Gases and Dust (Nebula)

16. In your own words, describe the Universe
Conclusion
Quick Write:
In your own words, describe the Universe

17. Part 2 - Measuring Distances in the Universe

18. *Astronomical Unit (AU’s) – the distance from Earth to the Sun
--used to measure distances in the
Solar System

19. *AU = 150 million kilometers (km) or 93 million miles

22. *Light year – the distance light travels through space in 1 year of time
--approximately 6 trillion miles per year
(6,000,000,000,000)
--670 million miles per hour
--386,000 miles per second
***Nothing travels faster than light***
-- 1 Light year = 63,200 AUs

23. **Over 5 million years traveling at jet airliner speed (550 mph)
*Light year
**Used to measure distances in the rest of the Universe
*It would take 4.3 years to travel (at the speed of light) to the nearest star (Alpha Centauri) from Earth
**Over 5 million years traveling at jet airliner speed (550 mph)

25. Sirius 8.6 ly Vega 25 ly Aldebaran 65 ly Betelgeuse 430 ly Rigel
STAR
DISTANCE
Sirius
8.6 ly
Vega
25 ly
Aldebaran
65 ly
Betelgeuse
430 ly
Rigel
773 ly

26. (Use light year units to support your claim)
Conclusion
Quick Write:
Explain why it is currently impossible for human space travel outside our Solar System
(Use light year units to support your claim)