You may also call my office at 661-395-4526 or communicate via regular postal mail at

If you need to send me a fax, fax your documents to 661-395-4328 with a prominent attention to Nick Strobel since many other people use that fax number too. After you fax your documents, send me an email alerting me to the fax.

If you find an error or something is not explained as well as you like/need, be sure to check the page on the official Astronomy Notes web site first. Many old copies of earlier versions of my astronomy material are scattered all over the web and you may be reading an old version of the page.

Note about answers to review questions: I do not have a key to the review questions because (1) most of them are simply recall answer type of questions so to make the key would just repeat what's already in the text and therefore writing a book's worth again; and (2) I use some of the more challenging ones as homework questions in my classes and I don't want to create a key that would be passed easily around. If there's a particular few that you'd like double-checking on, I could check your answer for those.

Note about including your link on this website: I usually do not provide links to commercial/business sites whose main purpose is to sell a product. I restrict the links on this site to those not-for-profit sites whose main purpose is to educate about science.

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last updated: August 13, 2014