On the cosmic horizon Book

I'm finally into this century in my chronological reading of the Library's astronomy collection. This book is a bit more simply written than most of the others -- I would say it would be a great book for a beginner, a high school or advanced Middle school reader, though it is already somewhat out of date. This is not to say that it doesn't have some information for a more sophisticated reader as well. I was impressed by the lack of "gosh wow" in a popular book; in fact this is a very conservative treatment, sticking to what is generally accepted or may be verified in the near future. It focuses on ten "mysteries" -- basic unanswered questions, such as whether there is/was microbial life elsewhere in the solar system, the solar neutrino question, the large scale structure of the universe, evolution of galaxies, extrasolar planets, gamma-ray bursters, inflation theories of cosmogony (but no mention of more speculative notions about multiverses or string theory), the critical density question, dark matter, and whether there is intelligent life in the universe -- and forecasts that many of them will be answered in the first decade of the new century (which hasn't happened yet, I assume because so many of the projects he discusses ended up being scaled down or cancelled due to the economic downturn and the oil wars.) At the end, he mentions a website related to the book to update future progress on the mysteries, but when I tried to access it it was no longer there.