Because the stars are the fundamental building blocks of the universe, decoding the message of starlight has been a central challenge and triumph of modern astronomy. By the time you have …

This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

Astronomy 2e was written by its three senior authors (see below) and was updated, reviewed, and vetted by a wide range of astronomers and astronomy educators in a strong community effort. …

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Study astronomy online free by downloading OpenStax's Astronomy book and using our accompanying online resources including an astronomy study guide.

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OpenStax textbooks come with free, aligned student and instructor resources. Explore our library of resources and decide what titles are right for your course. Peer reviewed, openly licensed, …

Tracing the evolutionary processes that continue to shape the universe is one of the most important (and satisfying) parts of modern astronomy. Previous Next Order a print copy

In this brief appendix, we want to give you some hints for the effective study of astronomy. These suggestions are based on ideas from good teachers and good students around the United …

This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.