The non-fiction and reference books in the Exploring Space Resource List are on Cart 3 for your use. This resource list will always be available if you wish to find one of these books in the future.
You can search for your broader object category or your specific example in the databases below. For example, you can search Britannica for "comet" or "Hale-Bopp".
If you need help, ask Mrs. QM or use the video supports on the databases page.