This text chronicles scientists at work on the most important questions about 21st century astronomy and the universe, highlighting the making of new discoveries.

With its "How Science Works" theme, 21st Century Astronomy emphasizes the process of scientific thinking and the relevance of scientific observations. The authors showcase the excitement of contemporary astronomy and encourage readers to consider both the methods and the goals of scientific research. Each text is packaged with a 21st Century Astronomy CD-ROM featuring interactive software and supplemental resources.