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This book is a reprint of the topical issue "UV Astronomy 2011" published by the journal Astrophysics and Space Science . Papers included in that topical issue cover four main topics of UV astronomy: stellar physics and evolution, planets, Milky Way and other galaxies and finally, UV instrumentation with an update on the current status of the main missions and technologies. This builds on the remarkable progress made in the field since the earlier topical issue: "Space Astronomy: the UV window to the Universe" which appeared in 2008.

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Editorial.- Chapter 1 Planets.- Chapter 2 Stellar Physics and Evolution.- Chapter 3 Milky Way and Galaxies.- Chapter 4 UV Instrumentation.

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Boris Shustov is a director of the leading Russian astronomical institute - INASAN. He is also PI of the World Space Observatory-Ultraviolet (WSO-UV) project. Ana I. Gomez de Castro is a Professor of Astronomy of the University Complutense of Madrid (Spain) and PI of the ISSIS imagers of the WSO-UV project. Mikhail Sachkov is PI of the WSO-UV spectrographs. Michael Dopita is Emeritus Professor at the Australian National University, Research School of Astronomy and Astrophysics, and Editor-in-Chief of the journal Astrophysics and Space Science.

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