Discovering the Essential Universe 6th Edition Comins Test Bank. This is a bank of tests (study questions) to help you prepare for the tests. To clarify, this is a test bank, not a textbook. You have immediate access to download your test bank. No delays, loading is fast and instant immediately after ordering! You will receive a full bank of tests; in other words, all chapters will be there. Test banks are presented in PDF format; therefore, no special software is required to open them.