View into the Distant Past. The Hubble Space Telescope has been used to explore dark regions of space where no bright stars or galaxies seem to appear. In particular, the Hubble Deep Field and Hubble...

View into the Distant Past. The Hubble Space Telescope has been used to explore dark regions of space where no bright stars or galaxies seem to appear. In particular, the Hubble Deep Field and Hubble Ultra Deep Field images were extremely long exposures of these dark regions and revealed that rich fields of very distant galaxies do, in fact, appear in these areas. Light emitted from these galaxies early in the life of the universe is just now reaching us. These images therefore provide us with a glimpse of the universe at a time just one or two billion years after the Big Bang. We will examine these two images. You will need a ruler for this project. In Starry Night Enthusiast™, open the Find pane, ensure that the Query (Q) box is empty and click on the Down () arrow in this box to display a list of image sources. a) Click on Hubble Images and double-click on Hubble Deep Field to STARRY NIGHT center the view on this dark region of space. Note its position with respect to the Big Dipper. (If you cannot identify this region of the northern sky, click on View
Constellations
Asterisms and
View Constellations Labels. Remove these indicators after you have identified the region.) Zoom in to a field of view about 3° wide and note that the region still appears to have no bright objects within it. Zoom in again until the Hubble Deep Field fills the view (about 7
 5 ). With your ruler, measure and record the visual angular diameters of 5 of the largest galaxies. b) Return to the Find pane and the list of Hubble Images and click on Hubble Ultra Deep Field to center the view of this “dark” region of the sky. Press the space bar to go there immediately. If necessary, zoom in to the same angular size as you were viewing the Hubble Deep Field. Measure the diameters of 5 of the largest galaxies in this image. Give at least two plausible reasons why the two images have different-sized largest galaxies.