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. General Astronomy
   | Wikibooks, Published in 2009
2. Solar Neutrinos
   V. Antonelli, L. Miramonti, C. Pena-Garay, A. Serenelli | arXiv, Published in 2012, 51 pages
3. Applied Cosmography: A Pedagogical Review
   Yu. L. Bolotin, et al. | arXiv.org, Published in 2018, 66 pages
4. Modified Gravity and Cosmology
   T. Clifton, P.G. Ferreira, A. Padilla, C. Skordis | arXiv, Published in 2012, 312 pages
5. Voyager Encounters Jupiter
   | National Aeronautics and Space Administration, Published in 1979, 48 pages
6. Lectures on Inflation and Cosmological Perturbations
   David Langlois | arXiv, Published in 2010, 56 pages
7. The Star Splitters: The High Energy Astronomy Observatories
   Wallace H. Tucker | NASA History Office, Published in 1984, 182 pages
8. The Cosmological Constant
   Sean M. Carroll | arXiv, Published in 2000, 50 pages
9. Star-Gazer's Hand-Book
   Henry William Elson | Sturgis & Walton, Published in 1910, 72 pages
10. Observations of the High Redshift Universe
    Richard S. Ellis | arXiv, Published in 2007, 115 pages
11. A Primer for Black Hole Quantum Physics
    R. Brout, S. Massar, R. Parentani, P. Spindel | arXiv, Published in 2007, 178 pages
12. An Introduction to the Theory of Rotating Relativistic Stars
    Eric Gourgoulhon | arXiv, Published in 2010, 88 pages
13. Elementary Astronomy
    James N. Pierce | , Published in 2013, 134 pages
14. Cosmology and Astrophysics
    Juan Garcia-Bellido | arXiv.org, Published in 2005, 76 pages
15. Mysteries of the Sun
    Ginger Butcher | NASA, Published in 2011, 20 pages
16. Curiosities of the Sky
    Garrett Putman Serviss | Harper & Brothers, Published in 1909, 300 pages
17. Introduction to Cosmology
    A. D. Dolgov | arXiv, Published in 2009, 58 pages
18. Planetary Rings
    Matthew S. Tiscareno | arXiv, Published in 2011, 82 pages
19. Sky Surveys
    S. G. Djorgovski, A.A. Mahabal, A.J. Drake, M.J. Graham, C. Donalek | arXiv, Published in 2012, 62 pages
20. Astronomy with an Opera-glass
    Garrett Putman Serviss | D. Appleton & co., Published in 1890, 154 pages
21. Mag 7 Star Atlas Project
    Andrew L. Johnson | , Published in 2007, 21 pages
22. Cosmology: The Study of the Universe
    | NASA, Published in 2009, 38 pages
23. Telescopic Work for Starlight Evenings
    William F. Denning | Taylor and Francis, Published in 1891, 372 pages
24. Voyager 1 and 2: Atlas of Six Saturnian Satellites
    Raymond M. Batson | NASA, Published in 1984, 175 pages
25. Spherical Astronomy
    F. Brünnow | Van Nostrand, Published in 1865, 559 pages
26. Hours With A Three-Inch Telescope
    William Noble | Longmans, Green & Co., Published in 1887, 159 pages
27. Vision and Voyages for Planetary Science in the Decade 2013-2022
    | National Academy of Sciences, Published in 2011, 410 pages
28. Evolution of the Solar System
    Hannes Alfven, Gustaf Arrhenius | NASA, Published in 1976
29. Recreations in Astronomy
    Henry White Warren | Project Gutenberg,
30. An Expanded View of the Universe
    | European Southern Observatory, Published in 2011, 54 pages
31. Lunar Stratigraphy and Sedimentology
    John Lindsay | Elsevier, Published in 1976, 311 pages
32. Caldwell Catalogue
    | Wikipedia, Published in 2014
33. A Text-book of Astronomy
    George C. Comstock | D. Appleton and company, Published in 1901, 391 pages
34. Supernova Cosmology: Legacy and Future
    Ariel Goobar, Bruno Leibundgut | arXiv, Published in 2011, 62 pages
35. An Introduction into the Theory of Cosmological Structure Formation
    Christian Knobel | arXiv, Published in 2012, 102 pages
36. Special Functions: Fractional Calculus and the Pathway for Entropy
    Hans J. Haubold (ed.) | MDPI AG, Published in 2018, 306 pages
37. Oulu Space Physics Textbook
    Reijo Rasinkangas | University of Oulu, Published in 2008
38. Celestial Mechanics: Notes and Work
    J.D. Mireles James | Rutgers University, Published in 2007, 128 pages
39. Why CMB physics?
    Massimo Giovannini | arXiv, Published in 2007, 179 pages
40. Practical Astronomy
    P. S. Michie, F. S. Harlow | John Wiley & Sons, Published in 1893, 246 pages
41. The Planet Mars: A History of Observation and Discovery
    William Sheehan | University of Arizona Press, Published in 1996, 270 pages
42. Lectures on Astronomy, Astrophysics, and Cosmology
    Luis A. Anchordoqui | arXiv, Published in 2007, 41 pages
43. High Energy Astrophysics
    Jonathan Katz | The Benjamin/Cummings Publishing, Published in 1986, 338 pages
44. The Galactic Habitable Zone I. Galactic Chemical Evolution
    G. Gonzalez, D. Brownlee, P. Ward | arXiv, Published in 2001, 57 pages
45. Introductory Lectures on Quantum Cosmology
    J. J. Halliwell | arXiv, Published in 1990, 107 pages
46. The First Stars
    Simon C. O. Glover | arXiv, Published in 2012, 72 pages
47. A Briefer History of Time: From the Big Bang to the Big Mac
    Eric Schulman | St. Martin's Press, Published in 2004, 207 pages
48. Celestial Mechanics
    J. B. Tatum | , Published in 2008
49. History of Astronomy
    George Forbes | , Published in 1909
50. Radiative Gas Dynamics
    David Weinberg | Ohio State University, Published in 2007
51. Multi-messenger Astronomy and Dark Matter
    Las Bergstrom | arXiv, Published in 2012, 105 pages
52. Atlas of Peculiar Galaxies
    Halton C. Arp | California Institute of Technology, Published in 1966, 190 pages
53. 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
54. Particle Physics and Inflationary Cosmology
    Andrei Linde | arXiv, Published in 2005, 270 pages
55. Origin of the Moon
    W. K. Hartmann, R. J. Phillips, G. J. Taylor | Lunar and Planetary Institute, Published in 1986, 781 pages
56. Voyager 1 Encounters Saturn
    | NASA, Published in 1980, 51 pages
57. Understanding Galaxy Formation and Evolution
    V. Avila-Reese | arXiv, Published in 2006, 50 pages
58. Solar System
    | Wikipedia, Published in 2012, 646 pages
59. Introduction to Physical Astronomy
    Kenneth R. Koehler | University of Cincinnati, Published in 2010
60. Mechanism of the Heavens
    Mary Somerville | J. Murray, Published in 1831, 710 pages
61. Inflationary Cosmology and Structure Formation
    J. A. Peacock | arXiv, Published in 1996, 77 pages
62. The Beginning and the End: The Meaning of Life in a Cosmological Perspective
    Clement Vidal | arXiv, Published in 2013, 356 pages
63. Mathematical Theories of Planetary Motions
    Otto Dziobek | The Register Pub. Co., Published in 1892, 314 pages
64. Trans-Neptunian Objects: An Overview
    | Wikipedia, Published in 2014
65. Amateur Telescope Making
    | Springfield Telescope Makers Inc, Published in 2018, 428 pages
66. Dynamics of the Universe in Problems
    Yu. L. Bolotin, et al. | UniverseInProblems.com, Published in 2013, 113 pages
67. The Telescope
    Louis Bell | McGraw-Hill, Published in 1922, 294 pages
68. Gravitational Waves: Sources, Detectors and Searches
    Keith Riles | arXiv, Published in 2012, 79 pages
69. Observatories in Space
    Catherine Turon | arXiv, Published in 2011, 50 pages
70. The Geology of the Terrestrial Planets
    Michael H. Carr | NASA, Published in 1984, 322 pages
71. Cosmos and Culture: Cultural Evolution in a Cosmic Context
    Steven J. Dick, Mark L. Lupisella | NASA, Published in 2010, 612 pages
72. Voyage to Jupiter
    David Morrison, Jane Samz | NASA, Published in 1980, 218 pages
73. Mathematical Problems Of Radiative Equilibrium
    Eberhard Hopf | Cambridge University Press, Published in 1934, 123 pages
74. The Practical Astronomer
    Thomas Dick | Seeley, Burnside, and Seeley, Published in 1845, 588 pages
75. Superstring Cosmology
    James E. Lidsey, David Wands, E. J. Copeland | arXiv, Published in 2000, 161 pages
76. Astronomy for Amateurs
    Camille Flammarion | D. Appleton and Company, Published in 1910
77. Cosmology Primer
    Sean Carroll | preposterousuniverse.com, Published in 2012, 120 pages
78. Cosmology for Particle Physicists
    U. A. Yajnik | arXiv, Published in 2008, 63 pages
79. Cosmology
    James Schombert | University of Oregon, Published in 2008
80. Supernovae
    | Wikipedia, Published in 2014
81. The Cosmic Web: Geometric Analysis
    Rien van de Weygaert, Willem Schaap | arXiv, Published in 2007, 129 pages
82. The Search for Extraterrestrial Intelligence, SETI
    Philip Morrison, John Billingham, John Wolfe | NASA, Published in 1979, 293 pages
83. The Hubble Constant
    Neal Jackson | arXiv, Published in 2014, 48 pages
84. Dense Matter in Compact Stars
    Andreas Schmitt | arXiv, Published in 2010, 146 pages
85. On the Origin (and Evolution) of Baryonic Galaxy Halos
    Duncan A. Forbes, Ericson D. Lopez | MDPI AG, Published in 2018, 232 pages
86. Astronomy Notes
    Nick Strobel | astronomynotes.com, Published in 2010
87. The Solar Magnetic Field
    Sami Solanki, Bernd Inhester, Manfred Schussler | arXiv, Published in 2010, 83 pages
88. Particle Physics Aspects of Modern Cosmology
    Robert H. Brandenberger | arXiv, Published in 1997, 70 pages
89. Advances in Global and Local Helioseismology: an Introductory Review
    Alexander G. Kosovichev | arXiv, Published in 2011, 86 pages
90. Views of the Solar System
    Calvin J. Hamilton | , Published in 2008
91. Introduction to Millimeter/Sub-Millimeter Astronomy
    T. L. Wilson | arXiv, Published in 2009, 106 pages
92. Planetary Science: A Lunar Perspective
    Stuart Ross Taylor | Lunar and Planetary Institute, Published in 1982
93. The Birth And Death Of The Sun
    George Gamow | Dover Publications, Published in 1940, 256 pages
94. From Chaos to Consciousness: A Brief History of the Universe
    Mike Corwin | Bookboon, Published in 2015, 166 pages
95. An Introduction to Celestial Mechanics
    Forest Ray Moulton | The MacMillan Company, Published in 1914, 437 pages
96. The Virial Theorem in Stellar Astrophysics
    George W. Collins, II | Pachart Pub. House, Published in 1978, 135 pages
97. The Formation and Evolution of the Solar System
    James Schombert | University of Oregon, Published in 2007
98. Chondrules and their Origins
    Elbert A. King | The Lunar and Planetary Institute, Published in 1983, 377 pages
99. Black Holes
    P.K. Townsend | arXiv, Published in 1997, 145 pages
100. Introduction to Dark Matter Experiments
     R. W. Schnee | arXiv.org, Published in 2011, 64 pages
101. Dark Energy: Observational Evidence and Theoretical Models
     B. Novosyadlyj, V. Pelykh, Yu. Shtanov, A. Zhuk | Akademperiodyka, Published in 2013, 380 pages
102. The Birth and Death of Stars
     James Schombert | University of Oregon, Published in 2008
103. An Introduction to Cosmic Rays and Gamma-Ray Bursts
     A. De Rujula | arXiv, Published in 2007, 37 pages
104. From Cosmic Birth to Living Earths: The Future of UVOIR Space Astronomy
     Julianne Dalcanton, et al. | arXiv, Published in 2015, 176 pages
105. Basaltic Volcanism on the Terrestrial Planets
     | Pergamon Press, Published in 1981, 1286 pages
106. Cosmic Journey: A History of Scientific Cosmology
     N. S. Hetherington, W. P. McCray | American Institute of Physics, Published in 2009
107. Recent Developments in Gravitational Collapse and Spacetime Singularities
     Pankaj S. Joshi, Daniele Malafarina | arXiv, Published in 2012, 89 pages
108. Exoplanet Observing for Amateurs
     Bruce L. Gary | Reductionist Publications, Published in 2007, 170 pages
109. Elements of Astrophysics
     Nick Kaiser | University of Hawaii, Published in 2002, 435 pages
110. Moon Trip: A Personal Account of the Apollo Program and its Science
     Elbert A. King | Lunar and Planetary Institute, Published in 1989, 162 pages
111. A Guide To The Constellations
     Samuel G. Barton | McGraw-Hill, Published in 1928, 96 pages
112. Ekpyrotic and Cyclic Cosmology
     Jean-Luc Lehners | arXiv, Published in 2009, 79 pages
113. Hubble Space Telescope: Discoveries
     | NASA, Published in 2012, 128 pages
114. A Handbook of Descriptive and Practical Astronomy
     George F. Chambers | Oxford At The Clarendon Press, Published in 1889, 756 pages
115. Gravitational Wave Experiments and Early Universe Cosmology
     Michele Maggiore | arXiv, Published in 2000, 100 pages
116. Magnetic Fields, Strings and Cosmology
     Massimo Giovannini | arXiv, Published in 2006, 76 pages
117. TASI Lectures: Introduction to Cosmology
     Mark Trodden, Sean M. Carroll | arXiv, Published in 2004, 82 pages
118. Astronomical Discovery
     Herbert Hall Turner | E. Arnold, Published in 1904, 225 pages
119. The Fundamentals of Stellar Astrophysics
     George W. Collins, II | W H Freeman & Co, Published in 2003, 494 pages
120. Through the Telescope
     James Baikie | Adam and Charles Black, Published in 1906, 303 pages
121. General Astronomy
     Harold Spencer Jones | Edward Arnold and Company, Published in 1924, 392 pages
122. An Introduction to Celestial Mechanics
     Richard Fitzpatrick | The University of Texas at Austin, Published in 2011, 216 pages
123. Supernova Remnants: The X-ray Perspective
     Jacco Vink | arXiv, Published in 2011, 78 pages
124. Primer Of Celestial Navigation
     John Favill | Cornell Maritime Press, Published in 1944, 300 pages
125. To a Rocky Moon: A Geologist's History of Lunar Exploration
     Don E. Wilhelms | University of Arizona Press, Published in 1993, 524 pages
126. A Simple Guide to Backyard Astronomy
     Carol Beigel | , Published in 2008, 61 pages
127. Cluster Lenses
     Jean-Paul Kneib, Priyamvada Natarajan | arXiv, Published in 2012, 120 pages
128. A New Astronomy
     David Peck Todd | American Book Company, Published in 1906, 437 pages
129. Gravitational Wave Detection by Interferometry
     Matthew Pitkin, Stuart Reid, Sheila Rowan, Jim Hough | arXiv, Published in 2011, 80 pages
130. Cosmological Evolution of Galaxies
     Isaac Shlosman | arXiv, Published in 2012, 88 pages
131. Introduction to Non-Baryonic Dark Matter
     Paolo Gondolo | arXiv, Published in 2004, 51 pages
132. Large Scale Structure of the Universe
     Alison L. Coil | arXiv, Published in 2012, 43 pages
133. A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
     Mary Bourke, Heather Viles | Planetary Science Institute, Published in 2007, 88 pages
134. Lectures on Black Holes, Topological Strings and Quantum Attractors
     Boris Pioline | arXiv, Published in 2007, 103 pages
135. Astronomy
     Andrew Fraknoi, David Morrison, Sidney C. Wolff | Unglue.it, Published in 2016, 1200 pages
136. Techniques of Radio Astronomy
     T. L. Wilson | arXiv, Published in 2011, 47 pages
137. Introduction to Early Universe Cosmology
     Robert H. Brandenberger | arXiv, Published in 2011, 70 pages
138. Galaxy systems in the optical and infrared
     A. Biviano | arXiv, Published in 2008, 60 pages
139. Handbook of Space Astronomy and Astrophysics
     Martin V. Zombeck | Cambridge University Press, Published in 2006, 780 pages
140. An Overview of the Solar System
     | Wikipedia, Published in 2013
141. Black-Hole Phenomenology
     Neven Bilic | arXiv, Published in 2006, 58 pages
142. Lunar Orbiter Photographic Atlas of the Moon
     D.E. Hughes, J.K. Bowker | Lunar and Planetary Institute, Published in 1971
143. Lecture notes on the formation and early evolution of planetary systems
     Philip J. Armitage | arXiv, Published in 2010, 63 pages
144. Astrodynamics: A Compendium of Orbitology
     | Wikipedia, Published in 2013, 334 pages
145. The Universe in a Helium Droplet
     Grigory E. Volovik | Oxford University Press, Published in 2003, 532 pages
146. Observing the Sky from 40N
     Roberto Mura | Wikibooks, Published in 2010, 86 pages
147. Notes on Stellar Astrophysics
     James N. Pierce | Minnesota State University, Published in 2013, 299 pages
148. Galaxies and the Expanding Universe
     James Schombert | University of Oregon, Published in 2008
149. Resources of Near-Earth Space
     J. S. Lewis, M. S. Matthews | University of Arizona Press, Published in 1993, 977 pages
150. Textbook on Practical Astronomy
     George Leonard Hosmer | Wiley, Published in 1910, 252 pages
151. Stellar Superfluids
     Dany Page, et al. | arXiv, Published in 2013, 88 pages
152. Ultrahigh Energy Cosmic Rays: Facts, Myths, and Legends
     Luis Alfredo Anchordoqui | arXiv, Published in 2011, 92 pages
153. Guide to Lunar Orbiter Photographs
     Thomas P. Hansen | NASA, Published in 1970, 127 pages
154. String Cosmology
     James M. Cline | arXiv, Published in 2007, 47 pages
155. Traces of Catastrophe
     Bevan M French | Lunar and Planetary Institute, Published in 1998, 120 pages
156. Big Bang Nucleosynthesis and Physics Beyond the Standard Model
     Subir Sarkar | arXiv, Published in 1996, 156 pages
157. Encyclopedia of Astrophysics
     Søren Bertil F. Dorch | Scholarpedia, Published in 2009
158. Advanced Topics in Cosmology: A Pedagogical Introduction
     T. Padmanabhan | arXiv, Published in 2006, 40 pages
159. Great Astronomers
     Robert S. Ball | Isbister, Published in 1895, 392 pages
160. Elementary Mathematical Astronomy
     C. Barlow, G. Bryan | University Correspondence College Press, Published in 1893, 442 pages
161. Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope
     Dylan Steele (ed.) | NASA, Published in 2015, 78 pages
162. Planetary Photometry
     Max Fairbairn | , Published in 2005
163. To See the Unseen: A History of Planetary Radar Astronomy
     Andrew J. Butrica | NASA History Division, Published in 1996, 301 pages
164. First Light
     Abraham Loeb | arXiv, Published in 2006, 157 pages
165. From Disks to Planets
     Andrew N. Youdin, Scott J. Kenyon | arXiv, Published in 2012, 70 pages
166. The Story of Eclipses
     George F. Chambers | S. S. McClure Co., Published in 1909, 208 pages
167. The Astrobiology Primer: An Outline of General Knowledge
     Lucas J. Mix, at al. | arXiv, Published in 2006, 79 pages
168. An introductory treatise on the lunar theory
     Ernest W Brown | Cambridge University Press, Published in 1896, 312 pages
169. Stellar Atmospheres
     J. B. Tatum | , Published in 2006
170. The Elements of Theoretical and Descriptive Astronomy
     Charles J. White | J. Wiley, Published in 1909, 322 pages
171. Everything You Always Wanted To Know About The Cosmological Constant Problem
     Jerome Martin | arXiv, Published in 2012, 89 pages
172. Chemistry in Protoplanetary Disks
     Thomas Henning, Dmitry Semenov | arXiv, Published in 2013, 84 pages
173. Short History of Astronomy
     Arthur Berry | John Murray, Published in 1898, 439 pages
174. Mars Science Laboratory
     | Wikipedia, Published in 2014
175. The world according to the Hubble Space Telescope
     Mario Livio | arXiv.org, Published in 2008, 112 pages
176. Searching for Life Across Space and Time
     | The National Academies Press, Published in 2017, 133 pages
177. Consolidated Lunar Atlas
     Gerald P. Kuiper, et al. | Lunar and Planetary Institute, Published in 1960
178. The Foundations of Celestial Mechanics
     George W. Collins, II | Pachart Pub House, Published in 2004, 145 pages
179. Neutrinos and the Stars
     Georg Raffelt | arXiv, Published in 2012, 83 pages
180. Gamma-Ray Bursts
     | Wikipedia, Published in 2014
181. Gamma-Ray Bursts: Progress, Problems and Prospects
     Bing Zhang, Peter Meszaros | arXiv, Published in 2008, 87 pages
182. Cosmology: Mankind's Grand Investigation
     Greg Bothun | Harcourt Brace College Publishers, Published in 1999, 129 pages
183. Introduction to Supersymmetry: Astrophysical and Phenomenological Constraints
     Keith A. Olive | arXiv, Published in 1999, 67 pages
184. Inflation
     Marieke Postma | NIKHEF, Published in 2009, 53 pages
185. Lecture Notes on High Energy Cosmic Rays
     M. Kachelriess | arXiv.org, Published in 2008, 82 pages
186. Man's Place in the Universe
     Alfred R. Wallace | Chapman and Hall, Published in 1904, 330 pages
187. Mercury
     F. Vilas, C. Chapman, M. Matthews | University of Arizona Press, Published in 1989, 794 pages
188. The History of Astrometry
     Michael Perryman | arXiv, Published in 2012, 52 pages
189. A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
     Licia Verde | arXiv, Published in 2008, 52 pages
190. Advances in Modern Cosmology
     Adnan Ghribi | InTech, Published in 2011, 198 pages
191. Plasma Physics of Extreme Astrophysical Environments
     Dmitri A. Uzdensky, Shane Rightley | arXiv, Published in 2014, 56 pages
192. Astronomy of To-day
     Cecil Goodrich Julius Dolmage | Seeley and co., Published in 1910
193. Cosmic Rays and the Search for a Lorentz Invariance Violation
     Wolfgang Bietenholz | arXiv, Published in 2008, 81 pages
194. Practical Astronomy for Engineers
     Frederick Hanley Seares | Stephens, Published in 1909, 160 pages
195. Archaeology, Anthropology, and Interstellar Communication
     Douglas A. Vakoch | NASA, Published in 2014, 330 pages
196. Observational Probes of Cosmic Acceleration
     David H. Weinberg, et al. | arXiv, Published in 2012, 253 pages
197. An Introduction to Astronomy
     Forest Ray Moulton | The MacMillan Company, Published in 1916, 577 pages
198. High Performance Computing and Numerical Modelling
     Volker Springel | arXiv, Published in 2014, 108 pages
199. Protostars and Planets
     | Rice University, Published in 2015, 422 pages
200. A Practical Introduction to Numerical Hydrodynamics
     Garrelt Mellema | Leiden University, Published in 2003
201. Pioneer Saturn Encounter
     | NASA, Published in 1979, 45 pages
202. Are We Alone?
     Gregg Easterbrook | The Atlantic Monthly, Published in 1988
203. Astronomical Image and Data Analysis
     J.-L. Starck, F. Murtagh | Springer, Published in 2006, 335 pages
204. Habitable Planets for Man
     Stephen H. Dole | RAND Corporation, Published in 1964, 176 pages
205. An Exposition on Inflationary Cosmology
     Scott Watson | arXiv, Published in 2000, 93 pages
206. Inflation and String Theory
     Daniel Baumann, Liam McAllister | arXiv, Published in 2014, 349 pages
207. Pioneers of Science
     Oliver Lodge | Macmillan and co, Published in 1905, 421 pages
208. Space Nomads
     Leota Jean LaPaz, Lincoln LaPaz | Holiday House, Published in 1961, 199 pages
209. Introduction to Cosmology
     David H Lyth | arXiv, Published in 1993, 53 pages
210. Astrochemistry: The Issue of Molecular Complexity in Astrophysical Environments
     M. De Becker | arXiv, Published in 2013, 62 pages
211. The Astronomy of the Bible
     E. Walter Maunder | Richard Clay & Sons, Published in 1908
212. Observing the Sky from 30S
     Roberto Mura | Wikibooks, Published in 2010, 86 pages
213. The Beginning and Evolution of the Universe
     Bharat Ratra, Michael S. Vogeley | arXiv, Published in 2008, 69 pages
214. A Review of the Universe: Structures, Evolutions, Observations, and Theories
     | universe-review.ca, Published in 2009
215. Atomic and Molecular Processes in Astronomy and Planetary Science
     Geoffrey A. Blake | California Institute of Technology, Published in 2004
216. Quantization in Astrophysics, Brownian Motion, and Supersymmetry
     F. Smarandache, V. Christianto | MathTiger, Published in 2007, 516 pages
217. Dwarf-Galaxy Cosmology
     Regina Schulte-Ladbeck, at al. | Hindawi Publishing, Published in 2010, 238 pages
218. Practical Astronomy
     George L. Hosmer | John Wiley and Sons Inc., Published in 1925, 314 pages
219. An Introduction to Quantum Cosmology
     D.L. Wiltshire | arXiv, Published in 2003, 60 pages
220. Planetary Theory
     Ernest Brown, Clarence Shook | Cambridge University Press, Published in 1933, 323 pages
221. An Introduction to Galactic Chemical Evolution
     Nikos Prantzos | arXiv, Published in 2007, 46 pages
222. Cosmic Microwave Background Anisotropies up to Second Order
     Nicola Bartolo, Sabino Matarrese, Antonio Riotto | arXiv, Published in 2007, 53 pages
223. Lopsided Spiral Galaxies
     Chanda J. Jog, Francoise Combes | arXiv, Published in 2008, 75 pages
224. Images of the Solar Upper Atmosphere From SUMER on SOHO
     Uri Feldman, at al. | ESA Publications Division, Published in 2003, 209 pages
225. Frequently Asked Questions about Calendars
     Claus Tøndering | , Published in 2008, 65 pages
226. Photographs of Nebulae and Clusters
     James Edward Keeler | University of California Publications, Published in 1908
227. The Shape of the Universe
     Gerd Pommerenke | viXra, Published in 2013, 321 pages
228. Radiative Processes in High Energy Astrophysics
     Gabriele Ghisellini | arXiv, Published in 2012, 157 pages
229. Guidebook to the Geology of Barringer Meteorite Crater, Arizona
     David A. Kring | Lunar and Planetary Institute, Published in 2007, 154 pages
230. Primordial Magnetogenesis
     Alejandra Kandus, Kerstin E. Kunze, Christos G. Tsagas | arXiv, Published in 2011, 107 pages
231. Protoplanetary Disks and Their Evolution
     Jonathan P. Williams, Lucas A. Cieza | arXiv, Published in 2011, 65 pages
232. Cosmology
     V. A. Rubakov | arXiv.org, Published in 2018, 56 pages
233. Cosmic Rays in Galactic and Extragalactic Magnetic Fields
     F. Aharonian, A. Bykov, E. Parizot, V. Ptuskin, A. Watson | arXiv, Published in 2011, 43 pages
234. Massive Stars and their Supernovae
     F. Thielemann, R. Hirschi, M. Liebendorfer, R. Diehl | arXiv, Published in 2010, 81 pages
235. Introduction to relativistic astrophysics and cosmology through Maple
     V. L. Kalashnikov | arXiv, Published in 2001, 124 pages
236. Celestial Navigation, Elementary Astronomy, Piloting
     Arturo Chiesa, Raffaele Chiesa | Sky and Sea Software, Published in 2010
237. Cosmic Structure, Averaging and Dark Energy
     David L. Wiltshire | arXiv, Published in 2013, 55 pages
238. The Complete Idiot's Guide to The Sun
     Jay M. Pasachoff | Alpha, Published in 2003, 350 pages
239. The Fine-Tuning of the Universe for Intelligent Life
     Luke A. Barnes | arXiv, Published in 2011, 76 pages
240. When Biospheres Collide: A History of NASA's Planetary Protection Programs
     Michael Meltzer | NASA, Published in 2011, 542 pages
241. Introduction to the Theory of Black Holes
     Gerard 't Hooft | Utrecht University, Published in 2009, 49 pages