Use the Stary Night Entbusiast TM program to examine the distribution of galaxies in our local universe. Select Favourites \(>\) Deep Space \(>\) Tully Database to display the 3 -dimensional distribution of the 28,000 galaxies nearest to the Milky Way. Stop Time and remove the image of the astronaut's feet by clicking on View > Feet. The Milky Way is at the center of the box. You can rotate the box by putting the mouse cursor over the image, holding down the mouse button and Shift key, and moving the mouse. (On a two-button mouse, hold down the left mouse button.) As you rotate this cube of galaxies, you will note the apparent lack of galaxies in one plane, the so-called Zone of Avoidance, caused by the obscuration of the light from distant galaxies in these directions by our own Milky Way Galaxy. You can zoom in or out using the buttons at the upper right of the toolbar. Note particularly the appearance of walls of galaxies, which surround voids in which few galaxies are found, and the clustering of galaxies at the interstices of these walls. Compare the box to the simulated present-day universe shown at the lower right of Figure \(27-19\). What are the similarities? What are the differences?

Step by step solution

01

Setup the Starry Night Enthusiast TM program

Open the Starry Night Enthusiast TM software. Select Favourites > Deep Space > Tully Database to display the 3D distribution of the 28,000 galaxies nearest to the Milky Way. Finally, stop time and remove the image of the astronaut's feet by clicking on View > Feet.

02

Examine the Distribution of Galaxies

With the Milky Way at the center of the box, rotate the box by placing the mouse cursor over the image, holding down the mouse button and Shift key, and moving the mouse. On a two-button mouse, hold down the left button while doing this. Observe and note the distribution, particularly the apparent lack of galaxies in one plane, known as the Zone of Avoidance, caused by the obscuration of light from distant galaxies in these directions by our own Milky Way Galaxy.

03

Zoom and Further Examine the Galaxy Distribution

Zoom in or out using the buttons at the upper right of the toolbar. Note the walls of galaxies, which surround voids with few galaxies, and the clustering of galaxies at the intersection of these walls.

04

Compare With Simulated Universe

Compare the observed universe with the simulated present-day universe indicated in Figure 27-19. Specifically look at the similarities and differences. Take some notes for reference.

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