Making Sense of the Universe:
Understanding Motion, Energy, and Gravity
How do we describe motion?
Precise definitions to describe motion:
Speed: Rate at which object moves
example: speed of 10 m/s
Velocity: Speed and
Astro 115 Exam 1 Study Guide
Reading: Ch1:section1.3, Ch 2, 3, 4+handouts. Also, Log onto Mastering Astronomy, look over the
homework, also in the upper right is a button marked study area use the tutorials and animations there.
The exam will be 50 questi
Galaxies And Our Milky Way
Islands of Stars
Our goals for learning
What are the three major types of galaxies?
What does our galaxy look like?
What stars are in our galaxy?
How do stars orbit in our galaxy?
What are the three major types
Instructor: Dr. Chris McCarthy
Sorry! This class is full. If you are not already
on the waitlist, you will not be admitted :(
However there might be room in:
Sec. 5: W 7:05 PM
-Homework & Exam S
If your name appears below, please see me
after class ends about adding the course.
1. You can find lecture notes, syllabi,
homework assignments, help sessions.
2. Astro Lingo
3. Voting Sheet.
Finish Chapter 2; Read Chapter 3
Optional: Sec. 3:12-3:17
Optional: Guided Discovery (p.86)
Homework Due: Tuesday Feb 26
Ofce Hours: Mon. 10AM-12:00
Help Sessions Available
7. A.) How many waves of red light are
there in a pen
Today: Finish Ch. 3
All of Chapter 4!
Optional: Ast. Toolbox 4-2
Optional: Stephan-Boltzman Law
Next Week: Start Ch. 5
Ofce Hours: Mon. 10:00AM-12:00 PM
The Best Location for a Telescope
Far away from civilization to avoid light pollution
On a mountai
How Big? How Far? Units of Distance
We all use units of distance in everyday life.
How tall is your brother? Over six feet. How far
away is your hometown? About 200 miles
Similarly, astronomers use different units to
measure different distance
Tuesday, March 18
Please bring a Scantron form: 882-E
Test will be closed book and notes. 45-50 questions.
Topics Covered Include:
Chapter 1: Scale of the universe. Light years, light minutes, constellations,
daily motions of Su
Read Chapter 5: The Sun
Required: Sec. 5:1-5:5, Sec. 5:7,
Also, Ast. Toolbox 5-1
Optional: Sec. 5:6, Sec. 5:8-10
HW 3 Due March 11
Ofce Hours: Mon. 10:00 AM -12:00 PM
(This week: Wed. 11-12)
(10th Floor Thornto
Finish Chapter 11 (Galaxies)
Skip Chapter 12
Read Chapter 13
(Sec. 13:11-12,13:15-13:16 optional)
Have a friend interested in Astro 115?
S/he can take it during the Summer (Sign up
And now for some bad news
Most of what we know about the uni
Fission or Fusion?
Start with light elements: Use
Fusion to produce energy
Start with heavy elements:
Use Fission to produce energy
If you start with IRON, you
cant produce any energy.
Making Heavy Elements
Starting with H,He,C,O,N
fusion can create many
Origin of Milky Ways Elements
Before they explode:
Type II Supernovae contain Iron
Type Ia Supernovae contain Oxygen and Carbon
After they explode:
Type II Supernova enrich the galaxy with Oxygen
Type Ia Supernovae enrich the galaxy with Iron