Transcript The Milky Way

The Milky Way
These are examples of other
galaxies: Where do we fit in?
Andromeda
Cartwheel
We look into the galaxy from Earth
A picture of our galaxy from within
our galaxy
The Milky Way visualized using infrared
The Milky Way is Spiral
The Galaxy Song
What to Listen For
•
•
•
•
•
•
•
•
•
How fast does earth revolve?
How fast do stars move?
Where in the Milky Way is Earth?
How many stars in the Milky Way
How many ly across?
How thick in the middle of the galaxy?
How thick out by us?
How far are we from center of the Milky Way?
How often do we go around?
http://www.gecdsb.on.ca/d&g/astro/music/Galaxy_Song.html
The Galaxy Song
•
•
•
Whenever life gets you down, Mrs.
Brown,
And things seem hard or tough,
And people are stupid, obnoxious
or daft,
And you feel that you've had quite
eno-o-o-o-o-ough...
Just remember that you're
standing on a planet that's
evolving
And revolving at nine hundred
miles an hour,
That's orbiting at nineteen miles a
second, so it's reckoned,
A sun that is the source of all our
power.
The sun and you and me and all
the stars that we can see
Are moving at a million miles a
day
In an outer spiral arm, at forty
thousand miles an hour,
Of the galaxy we call the "Milky
Way".
•
•
Our galaxy itself contains a hundred
billion stars.
It's a hundred thousand light years
side to side.
It bulges in the middle, sixteen
thousand light years thick,
But out by us, it's just three thousand
light years wide.
We're thirty thousand light years from
galactic central point.
We go 'round every two hundred
million years,
And our galaxy is only one of millions of
billions
In this amazing and expanding universe.
(Animated calliope interlude)
The universe itself keeps on expanding
and expanding
In all of the directions it can whizz
As fast as it can go, at the speed of light,
you know,
Twelve million miles a minute, and that's
the fastest speed there is.
So remember, when you're feeling very
small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life
somewhere up in space,
'Cause there's bugger all down here on
Earth.
The Essay
• To answer the Galaxy essay on the test
you will need to
– Describe/define what a galaxy is
– Describe the 3 types (pictures would be
helpful)
– Describe the Milky Way (a picture would be
helpful)
• Size, shape, # of stars etc. . .
• Where are we? What stars do we see etc. . .
So we have talked about 3 of the 4
essays
1. Analyzing light
2. Life cycle of a star (choose one or the other)
3. Galaxy
• The only one we did not talk about was the
characteristics of stars, these were 1 full day of
notes and 28.2 in the book.
–
–
Temperature, distance, color, size, elements,
magnitude etc. . .
FOR EACH CHARACTERISTIC Talk about what the
characteristic is, why it is important in describing a
star and how it is determined