Unit Eight: Galaxies
Embedded Files
What will be graded:
What will be graded:
Daily Star Dates *(varies depending on class)
In class - Galactic Coordinates
In class - Classifying Types of Galaxies
In class - Galaxy Evolution
In class - Center of Galaxy Lab
Star Date:
Star Date:
Use this link to listen to the 2 minute podcast. Keep a journal record of the topics discussed.
Our "@Home" Planetarium - we can not always be in the planetarium, especially when we're at home. This is a web-based version of the planetarium - or, at least, as close as you can get. You just have to set it up on your computer.
Galactic Coordinates
Galactic Coordinates
Observing objects in the night sky is easy. The difficult part is trying to point out the location of these objects to someone else. Using the planetarium, we will develop 2 different methods of locating objects in the night sky.
Simulations below: (enable FLASH)
Galaxy Classification
Galaxy Classification
There are 100 billion stars in the average galaxy. The universe contains between 50 billion to 1 trillion galaxies. The average galaxy is about 100,000 light-years in diameter; therefore, it would take light that many years to travel from one end to another.
In Planetarium:
We will look at galaxies and classify them into groups. Use the link "Types of Galaxies in the Universe" and the above attachment to get you started. If you miss the day in the planetarium, use the "Galaxy Tour" video or use this link 1 to classify the galaxies that are on the list. Link 2 can also be helpful.
Galaxy classification "Image" websites:
https://www.eso.org/public/images/archive/category/galaxies/
http://www.zsolt-frei.net/Gcat_htm/cat_ims.htm (Chrome browsers only - can click through)
Your assignment is to complete the 3 "Classify Galaxy" pages (1, 2, and 3) using the above info and notes from the planetarium.
Here is the list of example objects we will view: M31, M33, M49, M51, M65/66, M82, M104, M105, M108, M101, Large and small Magellanic Clouds (NGC-292)
This link will explain the similarities and differences between each of these types of galaxies.
Draw images of galaxy shapes and how they change over time.
Galaxy Structure
Galaxy Structure
DO NOT PRINT THE NCG CLUSTER DOCUMENT
Were you ever under the impression that we are in the center of the Milky Way galaxy.
Now, has anyone ever pointed out the Milky Way to you in the night's sky? Well, you won't see an image like the above one, but you may be lucky enough to see an image such as this one (below). Notice the milky haze in the sky? That is a part of the Milky Way Galaxy.
Recall the example in the last lesson that explains why you can't see the entire galaxy, for the same reason that you can't see a picture of what your entire living room looks like when you're sitting in it. However, you can see parts of your living room as you look outward. This is exactly what happens when you see this hazy band, which is part of the Milky Way.
This link is a way of showing how the galaxy's spiral arms are created through Spiral Density Waves
Center of Milky Way Lab:
Follow instructions in the lab sheet. Plot the Globular Clusters on the Polar Graph paper, determine where the sun is located in respect to the central bulge of the our galaxy. The clusters tend to clump near the galactic center.
Galaxy Review Game (Study Guide)
Galaxy Review Game (Study Guide)
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