Comprehensive guide to astronomy on the internet written for astronomers and astrophysicists.

Astronomer Kidger has spent his career helping the general public understand the nature of the universe and astronomy. In "Astronomical Enigmas," he offers answers to the questions he is asked most frequently.

This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This is the first non-technical book on spectroscopy written specifically for practical amateur astronomers. It includes all the science necessary for a qualitative understanding of stellar spectra, but avoids a mathematical treatment which would alienate many of its intended readers. Any amateur astronomer who carries out observational spectroscopy and who wants a non-technical account of the physical processes which determine the intensity and profile morphology of lines in stellar spectra will find this is the only book written specially for them. It is an ideal companion to existing books on observational amateur astronomical spectroscopy.

Since humans first looked up at the stars, astronomy has had a particular ability to stir the imagination and challenge the thinking of scientists and non-scientists alike. Astronomy: The Human Quest for Understanding is an introductory astronomy textbook specifically designed to relate to non-science majors across a wide variety of disciplines, nurture their curiosity, and develop vital science-based critical-thinking skills. This textbook provides an introduction to how science operates in practice and what makes it so successful in uncovering nature's secrets. Given that the study of astronomy dates back thousands of years, it is the ideal subject for tracing the development of the physical sciences and how our evolving understanding of nature has influenced, and been influenced by, mathematics, philosophy, religion, geography, politics, and more. This historical approach also illustrates how wrong turns have been taken, and how the inherent self-correcting nature of science through constant verification and the falsifiability of truly scientific theories ultimately leads us back to a more productive path in our quest for understanding. This approach also points out why, as a broadly educated citizenry, students of all disciplines must understand how scientists arrive at conclusions, and how science and technology have become central features of modern society. In discussing this fascinating and beautiful universe of which we are a part, it is necessary to illustrate the fundamental role that mathematics plays in decoding nature's mysteries. Unlike other similar textbooks, some basic mathematics is integrated naturally into the text, together with interpretive language, and supplemented with numerous examples; additional tutorials are provided on the book's companion website. Astronomy: The Human Quest for Understanding leads the reader down the path to our present-day understanding of our Solar System, stars, galaxies, and the beginning and evolution of our universe, along with profound questions still to be answered in this ancient, yet rapidly changing field.

In preparing the report, Astronomy and Astrophysics in the New Millenium , the AASC made use of a series of panel reports that address various aspects of ground- and space-based astronomy and astrophysics. These reports provide in-depth technical detail. Astronomy and Astrophysics in the New Millenium: An Overview summarizes the science goals and recommended initiatives in a short, richly illustrated, non-technical booklet.

Written with the primary purpose of enabling everyone to gain more pleasure from stargazing.