Teacher Page: Grab Bag
While it may look confusing at first, the database for the HDF-N is easy to use in a classroom without a computer. The first column of numbers contains a reference number for each of the 1067 galaxies included in this database. The last column of numbers gives the classification of the galaxy: 1 = elliptical, 2 and 3 = spiral, and 4 = irregular. (The type "2" spirals have a tighter spiral pattern than the type "3" spirals. For the purposes of this activity, the two types of spirals should be grouped together.) The other numbers can be ignored. You can use the website listed in the Grab Bag (see "References Found Outside the Institute") to generate sets of random numbers. Use 1 to 1067 to set the number range. Then, use the random numbers from the website to select galaxies from the database. Read across to the last column to determine the galaxy type.
To use the database for the HDF-S, you will need to number the galaxies starting with 1 and ending with 1275. In this database, the galaxies are identified by letters (instead of numbers) in the last column: "E" = elliptical, "S" = spiral, and "Irr" = irregular. If the last column says "star," the object is a star in our galaxy.
Certain lesson pages and images, listed below, have been provided as JPEG and PDF files. The JPEGs are for computer presentations outside of the web-based lesson and the PDFs are for overhead projector presentations. The graphics in the PDFs have been altered so that they will make good overhead projector transparencies. The JPEG files have not been altered and look just like the web-based lesson pages. The JPEGs are NOT optimized for overhead projectors. In the two tables below, the downloadable file name appears on the right and the title of the web page or image on which it is based appears at left:
JPEGs for computer presentations:
|Page or image description||Downloadable JPEG file name|
|'Meet Hubble Deep Field North'||meethdfn.jpg|
|'Meet Hubble Deep Field South'||meethdfs.jpg|
|HDF-N and HDF-S side by side (doesn't appear in the web lesson)||HDF-N_and_HDF-S.jpg|
|'Deep=Faint=Distant=Earlier in Time'||whatisdeep.jpg|
|'Why Choosing With Eyes Closed is Biased'||eyesclosed_biased.jpg|
|'Comparing Sampling Methods'||cmpare_sampl_mthds.jpg|
|'Variability vs. Sample Size-- Smaller Sample Sizes'||var_vs_smplsize_small.jpg|
|'Variability vs. Sample Size-- Middle Sample Sizes'||var_vs_smplsize_middle.jpg|
|'Variability vs. Sample Size-- Larger Sample Sizes'||var_vs_smplsize_large.jpg|
|'Where's the Best Sample Size-- Min/max Plots Only'||best_minmaxonly.jpg|
|'Where's the Best Sample Size-- Median and Line'||best_median.jpg|
|'Where's the Best Sample Size-- Mean and Line'||best_mean.jpg|
|'Where's the Best Sample Size-- Median with Smallest Sample Region Highlighted'||best_smallstreas_median.jpg|
|'Where's the Best Sample Size-- Mean with Smallest Sample Region Highlighted'||best_smallstreas_mean.jpg|
|'HDF-N: Where's the Best Sample Size?'||hdf-n_bestsample.jpg|
|'Stare and Compare: Astronomers' Results for Both Deep Fields'||compareastronresults.jpg|
|'Does the Universe Look the Same in All Directions?'||sameinalldirections.jpg|
|'The Universe Looks Different at Different Depths'||alldepths_notsame.jpg|
PDFs for making overhead projector transparencies:
Page or image description Downloadable PDF file name HDF-N and HDF-S side by side HDF-N_and_HDF-S.pdf 'Banishing Bias' and 'Why Choosing With Eyes Closed is Biased' banishingbias.pdf 'Comparing Sampling Methods' cmpare_sampl_mthds.pdf 'Variability vs. Sample Size-- Smaller Sample Sizes' var_vs_smplsize_small.pdf 'Variability vs. Sample Size-- Middle Sample Sizes' var_vs_smplsize_middle.pdf 'Variability vs. Sample Size-- Larger Sample Sizes' var_vs_smplsize_large.pdf 'Where's the Best Sample Size-- Min/max Plots Only' best_minmaxonly.pdf 'Where's the Best Sample Size-- Median and Line' best_median.pdf 'Where's the Best Sample Size-- Mean and Line' best_mean.pdf 'Where's the Best Sample Size-- Median with Smallest Sample Region Highlighted' best_smallstreas_median.pdf 'Where's the Best Sample Size-- Mean with Smallest Sample Region Highlighted' best_smallstreas_mean.pdf 'HDF-N: Where's the Best Sample Size?' HDF-Nbestsample.pdf 'Stare and Compare: Astronomers' Results for Both Deep Fields' compareastronresults.pdf 'Does the Universe Look the Same in All Directions?' sameinalldirections.pdf 'The Universe Looks Different at Different Depths' alldepths_notsame.pdf
One of the unique features of using the World Wide Web is the ability to move quickly and easily to other links of related topics. If you find an appropriate related link, don't forget to bookmark it for later use. These related links can play an important role in enhancing your lesson. You can use them to gather research information, learn the latest current events information, and introduce or follow up a specific lesson module. Here are some Web pages that relate to the topic:
Below you will find a vast amount of information regarding the topic of Galaxies and Statistics. The information comes from many sources other than the Insitute.
Some of the resources are quite in depth, and it is easy to get lost. It is suggested that you bookmark this page before you examine each source. That way, should you get lost, you can simply use the bookmark to return to the main page.
You may occasionally find a site "under construction," or you may find that a site is completely gone. There is no way to control such situations as the sites are out of Space Telescope Science Institute's control.
Books and Other Printed Material