What is dark matter? Why is the universe expanding? What happens when galaxies collide?

A Degree in a Book: Cosmology is the perfect introduction to cosmology, astronomy and astrophysics. Written by one of NASA's leading astronomers and educators, it provides you with the essential foundations for understanding the science behind the universe we live in. Featuring full-colour diagrams and illustrations throughout, as well as definition boxes, ideas for further reading and breakdowns of the key theories in the subject, learning cosmology has never been easier.

ABOUT THE SERIES: Get the knowledge of a degree for the price of a book with Arcturus Publishing's A Degree in a Book series. Written by experts in their fields, these highly visual guides feature flow charts, infographics, handy timelines, information boxes, feature spreads and margin annotations, allowing readers to get to grips with complex subjects in no time.

Sten Odenwald is the Director of the STEM Resource Development project at NASA, a long-time astronomer and he is passionate about promoting science education. Over the course of his career, he has taught at Harvard University and the Smithsonian Institution, he has appeared on TV for National Geographic and has written numerous articles for magazines ranging from Astronomy magazine to Scientific American. He also runs the blog 'The Astronomy Café', where he seeks to bring cosmology and astronomy to a wider audience.