Download Intro to Astronomy Power Point

Tape the worksheet on page 96 in your journal.
Agenda
Today
1. Intro to Astronomy
2. Notes on page 96
3. Catch up
• Test Make Up
• Buget Vocab
• Download Solar
System App on
Chromebooks
State Science Exam
Next Month!
State Science Exam
Next Month!
Advanced – Above Grade Level
Proficient – At Grade Level
Basic – Below Grade Level
Below Basic – Far Below Grade
Level
3 Minute Countdown!
Exit Slip
1. Budget Vocab & Sticky on
Period Bin.
2. Pick up 3 pieces of trash
3. Cleanest rows with no trash
will be dismissed 1st.
Introduction to Galaxies
What are Galaxies?
• Galaxies are
collections of:
–
–
–
–
STARS
GAS
DUST
DARK MATTER
• There are 3 main types
of Galaxies
3 Main Types
• Irregular
• Spiral
• Elliptical
Types of Galaxies III. Irregulars
Irregular galaxies lack any specific
form and contain stars, gas and dust
generally associated with a youth.
The irregular galaxy at right is the
Large Magellanic Cloud, a satellite
of the Milky Way located about
180,000 light years from the sun.
The LMC is about 60,000 light years
across. The bright reddish feature in
the upper right is the “Tarantula
Nebula” a region of star formation
in the LMC. (NOAO/AURA Photo)
Types of Galaxies I. Spirals
Spiral galaxies are so-named because of the
graceful shapes of arms emanating from a bright
central nucleus. Spirals are classified according to
how tightly or loosely wound the arms are, and it
turns out that the brightness of the central nucleus
is correlated to the tightness of the arm. The
galaxies M 104 (below) and M 51 (right)
respectively show tightly and loosely wounds.
Notice the effects of dust in both galaxies.
(NOAO/AURA Photos)
Types of Galaxies II. Ellipticals
Elliptical galaxies lack spiral arms and dust
and contain stars that are generally
identified as being old. The elliptical galaxies
M 32 (below) and M 110 (right) show
varying degrees of ellipticity.
(NOAO/AURA Photos)
Our Galaxy
• The Milky Way
• What type of Galaxy
is it?
• Guess how many stars
are in our galaxy?
Our Galaxy
• The Milky Way
• What type of Galaxy
is it?
• Guess how many stars
are in our galaxy?
300 to 400 Billion!
Our Sun
• Our Sun is a STAR
• STARS are huge hot
burning balls of gas.
• Our sun is only 1 of 400
billion STARS in the
Milky Way Galaxy.
• This is our Solar System
A zoom-in to a massive star forming region
Zoom-in
M16
(Eagle)
M17
(Horseshoe)
Milky Way
M8
(Lagoon)
Hale-Bopp
Jupiter
Picture credit: W. Keel
A zoom-in to a massive star forming region
Eagle
Nebula
(M16)
Picture credit: T.A. Rector & B.A. Wolpa
A zoom-in to a massive star forming region
Eagle
Nebula
(M16)
Picture Credit: J. Hester & P. Scowen
A zoom-in to a massive star forming region
Eagle
Nebula
(M16)
Picture Credit: J. Hester & P. Scowen
A zoom-in to a massive star forming region
size of our solar system
Eagle
Nebula
(M16)
Picture Credit: J. Hester & P. Scowen