Free Astronomy Books

This is the updated list of astronomy books available for free download or online reading. These books and papers cover all the areas of astrophysics, cosmology, galactic and extragalactic astronomy, solar and stellar physics, celestial mechanics, planetary science, astrobiology, as well as some popular works. The books are made available free of charge to the reader by their authors or publishers. Here is a categorized directory of astronomy books. This page is updated daily.

1. Cosmic Structure, Averaging and Dark Energy
   David L. Wiltshire | arXiv, Published in 2013, 55 pages
2. A Simple Guide to Backyard Astronomy
   Carol Beigel | , Published in 2008, 61 pages
3. An introductory treatise on the lunar theory
   Ernest W Brown | Cambridge University Press, Published in 1896, 312 pages
4. The Story of Eclipses
   George F. Chambers | S. S. McClure Co., Published in 1909, 208 pages
5. Dwarf-Galaxy Cosmology
   Regina Schulte-Ladbeck, at al. | Hindawi Publishing, Published in 2010, 238 pages
6. To a Rocky Moon: A Geologist's History of Lunar Exploration
   Don E. Wilhelms | University of Arizona Press, Published in 1993, 524 pages
7. Consolidated Lunar Atlas
   Gerald P. Kuiper, et al. | Lunar and Planetary Institute, Published in 1960
8. Stellar Superfluids
   Dany Page, et al. | arXiv, Published in 2013, 88 pages
9. Lunar Stratigraphy and Sedimentology
   John Lindsay | Elsevier, Published in 1976, 311 pages
10. Lopsided Spiral Galaxies
    Chanda J. Jog, Francoise Combes | arXiv, Published in 2008, 75 pages
11. Atomic and Molecular Processes in Astronomy and Planetary Science
    Geoffrey A. Blake | California Institute of Technology, Published in 2004
12. Plasma Physics of Extreme Astrophysical Environments
    Dmitri A. Uzdensky, Shane Rightley | arXiv, Published in 2014, 56 pages
13. Cosmology: The Study of the Universe
    | NASA, Published in 2009, 38 pages
14. Great Astronomers
    Robert S. Ball | Isbister, Published in 1895, 392 pages
15. Basaltic Volcanism on the Terrestrial Planets
    | Pergamon Press, Published in 1981, 1286 pages
16. Cosmology Primer
    Sean Carroll | preposterousuniverse.com, Published in 2012, 120 pages
17. Voyager 1 and 2: Atlas of Six Saturnian Satellites
    Raymond M. Batson | NASA, Published in 1984, 175 pages
18. Supernova Cosmology: Legacy and Future
    Ariel Goobar, Bruno Leibundgut | arXiv, Published in 2011, 62 pages
19. Cosmic Rays in Galactic and Extragalactic Magnetic Fields
    F. Aharonian, A. Bykov, E. Parizot, V. Ptuskin, A. Watson | arXiv, Published in 2011, 43 pages
20. Ultrahigh Energy Cosmic Rays: Facts, Myths, and Legends
    Luis Alfredo Anchordoqui | arXiv, Published in 2011, 92 pages
21. Cosmological Evolution of Galaxies
    Isaac Shlosman | arXiv, Published in 2012, 88 pages
22. Star-Gazer's Hand-Book
    Henry William Elson | Sturgis & Walton, Published in 1910, 72 pages
23. An Introduction to Celestial Mechanics
    Forest Ray Moulton | The MacMillan Company, Published in 1914, 437 pages
24. The Cosmic Web: Geometric Analysis
    Rien van de Weygaert, Willem Schaap | arXiv, Published in 2007, 129 pages
25. Introduction to Dark Matter Experiments
    R. W. Schnee | arXiv.org, Published in 2011, 64 pages
26. Mercury
    F. Vilas, C. Chapman, M. Matthews | University of Arizona Press, Published in 1989, 794 pages
27. From Chaos to Consciousness: A Brief History of the Universe
    Mike Corwin | Bookboon, Published in 2015, 166 pages
28. Astronomy with an Opera-glass
    Garrett Putman Serviss | D. Appleton & co., Published in 1890, 154 pages
29. Introduction to Millimeter/Sub-Millimeter Astronomy
    T. L. Wilson | arXiv, Published in 2009, 106 pages
30. The Star Splitters: The High Energy Astronomy Observatories
    Wallace H. Tucker | NASA History Office, Published in 1984, 182 pages
31. Practical Astronomy for Engineers
    Frederick Hanley Seares | Stephens, Published in 1909, 160 pages
32. An Introduction to Quantum Cosmology
    D.L. Wiltshire | arXiv, Published in 2003, 60 pages
33. The Cosmological Constant
    Sean M. Carroll | arXiv, Published in 2000, 50 pages
34. Celestial Mechanics: Notes and Work
    J.D. Mireles James | Rutgers University, Published in 2007, 128 pages
35. Curiosities of the Sky
    Garrett Putman Serviss | Harper & Brothers, Published in 1909, 300 pages
36. Mechanism of the Heavens
    Mary Somerville | J. Murray, Published in 1831, 710 pages
37. Particle Physics Aspects of Modern Cosmology
    Robert H. Brandenberger | arXiv, Published in 1997, 70 pages
38. The Complete Idiot's Guide to The Sun
    Jay M. Pasachoff | Alpha, Published in 2003, 350 pages
39. Introduction to Physical Astronomy
    Kenneth R. Koehler | University of Cincinnati, Published in 2010
40. A Briefer History of Time: From the Big Bang to the Big Mac
    Eric Schulman | St. Martin's Press, Published in 2004, 207 pages
41. Advances in Modern Cosmology
    Adnan Ghribi | InTech, Published in 2011, 198 pages
42. An Introduction to the Theory of Rotating Relativistic Stars
    Eric Gourgoulhon | arXiv, Published in 2010, 88 pages
43. Encyclopedia of Astrophysics
    Søren Bertil F. Dorch | Scholarpedia, Published in 2009
44. Cosmology for Particle Physicists
    U. A. Yajnik | arXiv, Published in 2008, 63 pages
45. Oulu Space Physics Textbook
    Reijo Rasinkangas | University of Oulu, Published in 2008
46. A Primer for Black Hole Quantum Physics
    R. Brout, S. Massar, R. Parentani, P. Spindel | arXiv, Published in 2007, 178 pages
47. Protostars and Planets
    | Rice University, Published in 2015, 422 pages
48. Cosmos and Culture: Cultural Evolution in a Cosmic Context
    Steven J. Dick, Mark L. Lupisella | NASA, Published in 2010, 612 pages
49. An Overview of the Solar System
    | Wikipedia, Published in 2013
50. Supernova Remnants: The X-ray Perspective
    Jacco Vink | arXiv, Published in 2011, 78 pages
51. Pioneer Saturn Encounter
    | NASA, Published in 1979, 45 pages
52. An Introduction to Astronomy
    Forest Ray Moulton | The MacMillan Company, Published in 1916, 577 pages
53. Solar Neutrinos
    V. Antonelli, L. Miramonti, C. Pena-Garay, A. Serenelli | arXiv, Published in 2012, 51 pages
54. Quantization in Astrophysics, Brownian Motion, and Supersymmetry
    F. Smarandache, V. Christianto | MathTiger, Published in 2007, 516 pages
55. Astronomical Image and Data Analysis
    J.-L. Starck, F. Murtagh | Springer, Published in 2006, 335 pages
56. Astronomy for Amateurs
    Camille Flammarion | D. Appleton and Company, Published in 1910
57. Notes on Stellar Astrophysics
    James N. Pierce | Minnesota State University, Published in 2013, 299 pages
58. Through the Telescope
    James Baikie | Adam and Charles Black, Published in 1906, 303 pages
59. Astronomy Notes
    Nick Strobel | astronomynotes.com, Published in 2010
60. The Galactic Habitable Zone I. Galactic Chemical Evolution
    G. Gonzalez, D. Brownlee, P. Ward | arXiv, Published in 2001, 57 pages
61. The Astrobiology Primer: An Outline of General Knowledge
    Lucas J. Mix, at al. | arXiv, Published in 2006, 79 pages
62. An Expanded View of the Universe
    | European Southern Observatory, Published in 2011, 54 pages
63. Lecture notes on the formation and early evolution of planetary systems
    Philip J. Armitage | arXiv, Published in 2010, 63 pages
64. Black Holes
    P.K. Townsend | arXiv, Published in 1997, 145 pages
65. The First Stars
    Simon C. O. Glover | arXiv, Published in 2012, 72 pages
66. Origin of the Moon
    W. K. Hartmann, R. J. Phillips, G. J. Taylor | Lunar and Planetary Institute, Published in 1986, 781 pages
67. The Fine-Tuning of the Universe for Intelligent Life
    Luke A. Barnes | arXiv, Published in 2011, 76 pages
68. Stellar Atmospheres
    J. B. Tatum | , Published in 2006
69. The Shape of the Universe
    Gerd Pommerenke | viXra, Published in 2013, 321 pages
70. A Handbook of Descriptive and Practical Astronomy
    George F. Chambers | Oxford At The Clarendon Press, Published in 1889, 756 pages
71. The Universe in a Helium Droplet
    Grigory E. Volovik | Oxford University Press, Published in 2003, 532 pages
72. From Disks to Planets
    Andrew N. Youdin, Scott J. Kenyon | arXiv, Published in 2012, 70 pages
73. Hubble Space Telescope: Discoveries
    | NASA, Published in 2012, 128 pages
74. Astronomical Discovery
    Herbert Hall Turner | E. Arnold, Published in 1904, 225 pages
75. Space Nomads
    Leota Jean LaPaz, Lincoln LaPaz | Holiday House, Published in 1961, 199 pages
76. Trans-Neptunian Objects: An Overview
    | Wikipedia, Published in 2014
77. Textbook on Practical Astronomy
    George Leonard Hosmer | Wiley, Published in 1910, 252 pages
78. Habitable Planets for Man
    Stephen H. Dole | RAND Corporation, Published in 1964, 176 pages
79. The Birth and Death of Stars
    James Schombert | University of Oregon, Published in 2008
80. Dynamics of the Universe in Problems
    Yu. L. Bolotin, et al. | UniverseInProblems.com, Published in 2013, 113 pages
81. The Formation and Evolution of the Solar System
    James Schombert | University of Oregon, Published in 2007
82. Supernovae
    | Wikipedia, Published in 2014
83. Gravitational Waves: Sources, Detectors and Searches
    Keith Riles | arXiv, Published in 2012, 79 pages
84. Primer Of Celestial Navigation
    John Favill | Cornell Maritime Press, Published in 1944, 300 pages
85. Vision and Voyages for Planetary Science in the Decade 2013-2022
    | National Academy of Sciences, Published in 2011, 410 pages
86. Cosmology
    V. A. Rubakov | arXiv.org, Published in 2018, 56 pages
87. Observatories in Space
    Catherine Turon | arXiv, Published in 2011, 50 pages
88. Techniques of Radio Astronomy
    T. L. Wilson | arXiv, Published in 2011, 47 pages
89. Solar System
    | Wikipedia, Published in 2012, 646 pages
90. Searching for Life Across Space and Time
    | The National Academies Press, Published in 2017, 133 pages
91. Cosmic Rays and the Search for a Lorentz Invariance Violation
    Wolfgang Bietenholz | arXiv, Published in 2008, 81 pages
92. Short History of Astronomy
    Arthur Berry | John Murray, Published in 1898, 439 pages
93. A Review of the Universe: Structures, Evolutions, Observations, and Theories
    | universe-review.ca, Published in 2009
94. Introduction to Cosmology
    A. D. Dolgov | arXiv, Published in 2009, 58 pages
95. Mars Science Laboratory
    | Wikipedia, Published in 2014
96. Are We Alone?
    Gregg Easterbrook | The Atlantic Monthly, Published in 1988
97. A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
    Licia Verde | arXiv, Published in 2008, 52 pages
98. Observational Probes of Cosmic Acceleration
    David H. Weinberg, et al. | arXiv, Published in 2012, 253 pages
99. Observations of the High Redshift Universe
    Richard S. Ellis | arXiv, Published in 2007, 115 pages
100. Modified Gravity and Cosmology
     T. Clifton, P.G. Ferreira, A. Padilla, C. Skordis | arXiv, Published in 2012, 312 pages
101. Voyage to Jupiter
     David Morrison, Jane Samz | NASA, Published in 1980, 218 pages
102. Inflation and String Theory
     Daniel Baumann, Liam McAllister | arXiv, Published in 2014, 349 pages
103. Observing the Sky from 40N
     Roberto Mura | Wikibooks, Published in 2010, 86 pages
104. A Guide To The Constellations
     Samuel G. Barton | McGraw-Hill, Published in 1928, 96 pages
105. Neutrinos and the Stars
     Georg Raffelt | arXiv, Published in 2012, 83 pages
106. Views of the Solar System
     Calvin J. Hamilton | , Published in 2008
107. Radiative Gas Dynamics
     David Weinberg | Ohio State University, Published in 2007
108. Everything You Always Wanted To Know About The Cosmological Constant Problem
     Jerome Martin | arXiv, Published in 2012, 89 pages
109. Evolution of the Solar System
     Hannes Alfven, Gustaf Arrhenius | NASA, Published in 1976
110. Cosmology
     James Schombert | University of Oregon, Published in 2008
111. Sky Surveys
     S. G. Djorgovski, A.A. Mahabal, A.J. Drake, M.J. Graham, C. Donalek | arXiv, Published in 2012, 62 pages
112. An Introduction to Galactic Chemical Evolution
     Nikos Prantzos | arXiv, Published in 2007, 46 pages
113. Applied Cosmography: A Pedagogical Review
     Yu. L. Bolotin, et al. | arXiv.org, Published in 2018, 66 pages
114. Lectures on Inflation and Cosmological Perturbations
     David Langlois | arXiv, Published in 2010, 56 pages
115. To See the Unseen: A History of Planetary Radar Astronomy
     Andrew J. Butrica | NASA History Division, Published in 1996, 301 pages
116. The Hubble Constant
     Neal Jackson | arXiv, Published in 2014, 48 pages
117. Celestial Mechanics
     J. B. Tatum | , Published in 2008
118. Cluster Lenses
     Jean-Paul Kneib, Priyamvada Natarajan | arXiv, Published in 2012, 120 pages
119. Ekpyrotic and Cyclic Cosmology
     Jean-Luc Lehners | arXiv, Published in 2009, 79 pages
120. General Astronomy
     | Wikibooks, Published in 2009
121. String Cosmology
     James M. Cline | arXiv, Published in 2007, 47 pages
122. The Beginning and the End: The Meaning of Life in a Cosmological Perspective
     Clement Vidal | arXiv, Published in 2013, 356 pages
123. Black-Hole Phenomenology
     Neven Bilic | arXiv, Published in 2006, 58 pages
124. From Cosmic Birth to Living Earths: The Future of UVOIR Space Astronomy
     Julianne Dalcanton, et al. | arXiv, Published in 2015, 176 pages
125. Mag 7 Star Atlas Project
     Andrew L. Johnson | , Published in 2007, 21 pages
126. Gamma-Ray Bursts
     | Wikipedia, Published in 2014
127. Lectures on Black Holes, Topological Strings and Quantum Attractors
     Boris Pioline | arXiv, Published in 2007, 103 pages
128. Particle Physics and Inflationary Cosmology
     Andrei Linde | arXiv, Published in 2005, 270 pages
129. Lunar Orbiter Photographic Atlas of the Moon
     D.E. Hughes, J.K. Bowker | Lunar and Planetary Institute, Published in 1971
130. Frequently Asked Questions about Calendars
     Claus Tøndering | , Published in 2008, 65 pages
131. Introductory Lectures on Quantum Cosmology
     J. J. Halliwell | arXiv, Published in 1990, 107 pages
132. Resources of Near-Earth Space
     J. S. Lewis, M. S. Matthews | University of Arizona Press, Published in 1993, 977 pages
133. Recent Developments in Gravitational Collapse and Spacetime Singularities
     Pankaj S. Joshi, Daniele Malafarina | arXiv, Published in 2012, 89 pages
134. Magnetic Fields, Strings and Cosmology
     Massimo Giovannini | arXiv, Published in 2006, 76 pages
135. Galaxies and the Expanding Universe
     James Schombert | University of Oregon, Published in 2008
136. On the Origin (and Evolution) of Baryonic Galaxy Halos
     Duncan A. Forbes, Ericson D. Lopez | MDPI AG, Published in 2018, 232 pages
137. Gravitational Wave Experiments and Early Universe Cosmology
     Michele Maggiore | arXiv, Published in 2000, 100 pages
138. Recreations in Astronomy
     Henry White Warren | Project Gutenberg,
139. Mysteries of the Sun
     Ginger Butcher | NASA, Published in 2011, 20 pages
140. The Fundamentals of Stellar Astrophysics
     George W. Collins, II | W H Freeman & Co, Published in 2003, 494 pages
141. Practical Astronomy
     George L. Hosmer | John Wiley and Sons Inc., Published in 1925, 314 pages
142. Primordial Magnetogenesis
     Alejandra Kandus, Kerstin E. Kunze, Christos G. Tsagas | arXiv, Published in 2011, 107 pages
143. Dark Energy: Observational Evidence and Theoretical Models
     B. Novosyadlyj, V. Pelykh, Yu. Shtanov, A. Zhuk | Akademperiodyka, Published in 2013, 380 pages
144. The Virial Theorem in Stellar Astrophysics
     George W. Collins, II | Pachart Pub. House, Published in 1978, 135 pages
145. Telescopic Work for Starlight Evenings
     William F. Denning | Taylor and Francis, Published in 1891, 372 pages
146. Gravitational Wave Detection by Interferometry
     Matthew Pitkin, Stuart Reid, Sheila Rowan, Jim Hough | arXiv, Published in 2011, 80 pages
147. High Performance Computing and Numerical Modelling
     Volker Springel | arXiv, Published in 2014, 108 pages
148. Elementary Astronomy
     James N. Pierce | , Published in 2013, 134 pages
149. Cosmology: Mankind's Grand Investigation
     Greg Bothun | Harcourt Brace College Publishers, Published in 1999, 129 pages
150. The Geology of the Terrestrial Planets
     Michael H. Carr | NASA, Published in 1984, 322 pages
151. Big Bang Nucleosynthesis and Physics Beyond the Standard Model
     Subir Sarkar | arXiv, Published in 1996, 156 pages
152. The History of Astrometry
     Michael Perryman | arXiv, Published in 2012, 52 pages
153. Protoplanetary Disks and Their Evolution
     Jonathan P. Williams, Lucas A. Cieza | arXiv, Published in 2011, 65 pages
154. Cosmic Microwave Background Anisotropies up to Second Order
     Nicola Bartolo, Sabino Matarrese, Antonio Riotto | arXiv, Published in 2007, 53 pages
155. The Practical Astronomer
     Thomas Dick | Seeley, Burnside, and Seeley, Published in 1845, 588 pages
156. TASI Lectures: Introduction to Cosmology
     Mark Trodden, Sean M. Carroll | arXiv, Published in 2004, 82 pages
157. History of Astronomy
     George Forbes | , Published in 1909
158. The Astronomy of the Bible
     E. Walter Maunder | Richard Clay & Sons, Published in 1908
159. Dense Matter in Compact Stars
     Andreas Schmitt | arXiv, Published in 2010, 146 pages
160. Planetary Theory
     Ernest Brown, Clarence Shook | Cambridge University Press, Published in 1933, 323 pages
161. Amateur Telescope Making
     | Springfield Telescope Makers Inc, Published in 2018, 428 pages
162. Elementary Mathematical Astronomy
     C. Barlow, G. Bryan | University Correspondence College Press, Published in 1893, 442 pages
163. Pioneers of Science
     Oliver Lodge | Macmillan and co, Published in 1905, 421 pages
164. Understanding Galaxy Formation and Evolution
     V. Avila-Reese | arXiv, Published in 2006, 50 pages
165. An Introduction to Cosmic Rays and Gamma-Ray Bursts
     A. De Rujula | arXiv, Published in 2007, 37 pages
166. Voyager 1 Encounters Saturn
     | NASA, Published in 1980, 51 pages
167. The Planet Mars: A History of Observation and Discovery
     William Sheehan | University of Arizona Press, Published in 1996, 270 pages
168. The Beginning and Evolution of the Universe
     Bharat Ratra, Michael S. Vogeley | arXiv, Published in 2008, 69 pages
169. Advances in Global and Local Helioseismology: an Introductory Review
     Alexander G. Kosovichev | arXiv, Published in 2011, 86 pages
170. An Introduction into the Theory of Cosmological Structure Formation
     Christian Knobel | arXiv, Published in 2012, 102 pages
171. Spherical Astronomy
     F. Brünnow | Van Nostrand, Published in 1865, 559 pages
172. Introduction to Early Universe Cosmology
     Robert H. Brandenberger | arXiv, Published in 2011, 70 pages
173. General Astronomy
     Harold Spencer Jones | Edward Arnold and Company, Published in 1924, 392 pages
174. Planetary Photometry
     Max Fairbairn | , Published in 2005
175. An Exposition on Inflationary Cosmology
     Scott Watson | arXiv, Published in 2000, 93 pages
176. Superstring Cosmology
     James E. Lidsey, David Wands, E. J. Copeland | arXiv, Published in 2000, 161 pages
177. Guide to Lunar Orbiter Photographs
     Thomas P. Hansen | NASA, Published in 1970, 127 pages
178. Radiative Processes in High Energy Astrophysics
     Gabriele Ghisellini | arXiv, Published in 2012, 157 pages
179. Galaxy systems in the optical and infrared
     A. Biviano | arXiv, Published in 2008, 60 pages
180. Introduction to Cosmology
     David H Lyth | arXiv, Published in 1993, 53 pages
181. The world according to the Hubble Space Telescope
     Mario Livio | arXiv.org, Published in 2008, 112 pages
182. An Introduction to Celestial Mechanics
     Richard Fitzpatrick | The University of Texas at Austin, Published in 2011, 216 pages
183. The Telescope
     Louis Bell | McGraw-Hill, Published in 1922, 294 pages
184. Planetary Science: A Lunar Perspective
     Stuart Ross Taylor | Lunar and Planetary Institute, Published in 1982
185. Hours With A Three-Inch Telescope
     William Noble | Longmans, Green & Co., Published in 1887, 159 pages
186. Images of the Solar Upper Atmosphere From SUMER on SOHO
     Uri Feldman, at al. | ESA Publications Division, Published in 2003, 209 pages
187. Advanced Topics in Cosmology: A Pedagogical Introduction
     T. Padmanabhan | arXiv, Published in 2006, 40 pages
188. Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope
     Dylan Steele (ed.) | NASA, Published in 2015, 78 pages
189. Astrodynamics: A Compendium of Orbitology
     | Wikipedia, Published in 2013, 334 pages
190. Astrochemistry: The Issue of Molecular Complexity in Astrophysical Environments
     M. De Becker | arXiv, Published in 2013, 62 pages
191. Practical Astronomy
     P. S. Michie, F. S. Harlow | John Wiley & Sons, Published in 1893, 246 pages
192. A Practical Introduction to Numerical Hydrodynamics
     Garrelt Mellema | Leiden University, Published in 2003
193. Cosmology and Astrophysics
     Juan Garcia-Bellido | arXiv.org, Published in 2005, 76 pages
194. The Foundations of Celestial Mechanics
     George W. Collins, II | Pachart Pub House, Published in 2004, 145 pages
195. Special Functions: Fractional Calculus and the Pathway for Entropy
     Hans J. Haubold (ed.) | MDPI AG, Published in 2018, 306 pages
196. Inflationary Cosmology and Structure Formation
     J. A. Peacock | arXiv, Published in 1996, 77 pages
197. Gamma-Ray Bursts: Progress, Problems and Prospects
     Bing Zhang, Peter Meszaros | arXiv, Published in 2008, 87 pages
198. Massive Stars and their Supernovae
     F. Thielemann, R. Hirschi, M. Liebendorfer, R. Diehl | arXiv, Published in 2010, 81 pages
199. Planetary Rings
     Matthew S. Tiscareno | arXiv, Published in 2011, 82 pages
200. The Birth And Death Of The Sun
     George Gamow | Dover Publications, Published in 1940, 256 pages
201. Chondrules and their Origins
     Elbert A. King | The Lunar and Planetary Institute, Published in 1983, 377 pages
202. A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
     Mary Bourke, Heather Viles | Planetary Science Institute, Published in 2007, 88 pages
203. Archaeology, Anthropology, and Interstellar Communication
     Douglas A. Vakoch | NASA, Published in 2014, 330 pages
204. Multi-messenger Astronomy and Dark Matter
     Las Bergstrom | arXiv, Published in 2012, 105 pages
205. Moon Trip: A Personal Account of the Apollo Program and its Science
     Elbert A. King | Lunar and Planetary Institute, Published in 1989, 162 pages
206. The Elements of Theoretical and Descriptive Astronomy
     Charles J. White | J. Wiley, Published in 1909, 322 pages
207. Introduction to relativistic astrophysics and cosmology through Maple
     V. L. Kalashnikov | arXiv, Published in 2001, 124 pages
208. When Biospheres Collide: A History of NASA's Planetary Protection Programs
     Michael Meltzer | NASA, Published in 2011, 542 pages
209. A Text-book of Astronomy
     George C. Comstock | D. Appleton and company, Published in 1901, 391 pages
210. Introduction to Non-Baryonic Dark Matter
     Paolo Gondolo | arXiv, Published in 2004, 51 pages
211. Handbook of Space Astronomy and Astrophysics
     Martin V. Zombeck | Cambridge University Press, Published in 2006, 780 pages
212. Elements of Astrophysics
     Nick Kaiser | University of Hawaii, Published in 2002, 435 pages
213. Observing the Sky from 30S
     Roberto Mura | Wikibooks, Published in 2010, 86 pages
214. Astronomy of To-day
     Cecil Goodrich Julius Dolmage | Seeley and co., Published in 1910
215. Why CMB physics?
     Massimo Giovannini | arXiv, Published in 2007, 179 pages
216. Atlas of Peculiar Galaxies
     Halton C. Arp | California Institute of Technology, Published in 1966, 190 pages
217. The Solar Magnetic Field
     Sami Solanki, Bernd Inhester, Manfred Schussler | arXiv, Published in 2010, 83 pages
218. Lectures on Astronomy, Astrophysics, and Cosmology
     Luis A. Anchordoqui | arXiv, Published in 2007, 41 pages
219. Traces of Catastrophe
     Bevan M French | Lunar and Planetary Institute, Published in 1998, 120 pages
220. Cosmic Journey: A History of Scientific Cosmology
     N. S. Hetherington, W. P. McCray | American Institute of Physics, Published in 2009
221. Mathematical Theories of Planetary Motions
     Otto Dziobek | The Register Pub. Co., Published in 1892, 314 pages
222. High Energy Astrophysics
     Jonathan Katz | The Benjamin/Cummings Publishing, Published in 1986, 338 pages
223. Large Scale Structure of the Universe
     Alison L. Coil | arXiv, Published in 2012, 43 pages
224. Celestial Navigation, Elementary Astronomy, Piloting
     Arturo Chiesa, Raffaele Chiesa | Sky and Sea Software, Published in 2010
225. Caldwell Catalogue
     | Wikipedia, Published in 2014
226. Primordial Nucleosynthesis: from precision cosmology to fundamental physics
     F. Iocco, G. Mangano, G. Miele, O. Pisanti, P.D. Serpico | arXiv, Published in 2009, 148 pages
227. Guidebook to the Geology of Barringer Meteorite Crater, Arizona
     David A. Kring | Lunar and Planetary Institute, Published in 2007, 154 pages
228. Chemistry in Protoplanetary Disks
     Thomas Henning, Dmitry Semenov | arXiv, Published in 2013, 84 pages
229. Introduction to the Theory of Black Holes
     Gerard 't Hooft | Utrecht University, Published in 2009, 49 pages
230. Exoplanet Observing for Amateurs
     Bruce L. Gary | Reductionist Publications, Published in 2007, 170 pages
231. Inflation
     Marieke Postma | NIKHEF, Published in 2009, 53 pages
232. First Light
     Abraham Loeb | arXiv, Published in 2006, 157 pages
233. Voyager Encounters Jupiter
     | National Aeronautics and Space Administration, Published in 1979, 48 pages
234. A New Astronomy
     David Peck Todd | American Book Company, Published in 1906, 437 pages
235. Astronomy
     Andrew Fraknoi, David Morrison, Sidney C. Wolff | Unglue.it, Published in 2016, 1200 pages
236. Mathematical Problems Of Radiative Equilibrium
     Eberhard Hopf | Cambridge University Press, Published in 1934, 123 pages
237. Introduction to Supersymmetry: Astrophysical and Phenomenological Constraints
     Keith A. Olive | arXiv, Published in 1999, 67 pages
238. Photographs of Nebulae and Clusters
     James Edward Keeler | University of California Publications, Published in 1908
239. Man's Place in the Universe
     Alfred R. Wallace | Chapman and Hall, Published in 1904, 330 pages