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. Techniques of Radio Astronomy
   T. L. Wilson | arXiv, Published in 2011, 47 pages
2. Radiative Processes in High Energy Astrophysics
   Gabriele Ghisellini | arXiv, Published in 2012, 157 pages
3. The world according to the Hubble Space Telescope
   Mario Livio | arXiv.org, Published in 2008, 112 pages
4. Astronomy Notes
   Nick Strobel | astronomynotes.com, Published in 2010
5. Elementary Mathematical Astronomy
   C. Barlow, G. Bryan | University Correspondence College Press, Published in 1893, 442 pages
6. Cosmology Primer
   Sean Carroll | preposterousuniverse.com, Published in 2012, 120 pages
7. Supernova Cosmology: Legacy and Future
   Ariel Goobar, Bruno Leibundgut | arXiv, Published in 2011, 62 pages
8. Mercury
   F. Vilas, C. Chapman, M. Matthews | University of Arizona Press, Published in 1989, 794 pages
9. An Introduction to Celestial Mechanics
   Forest Ray Moulton | The MacMillan Company, Published in 1914, 437 pages
10. Curiosities of the Sky
    Garrett Putman Serviss | Harper & Brothers, Published in 1909, 300 pages
11. Cluster Lenses
    Jean-Paul Kneib, Priyamvada Natarajan | arXiv, Published in 2012, 120 pages
12. A Practical Introduction to Numerical Hydrodynamics
    Garrelt Mellema | Leiden University, Published in 2003, 124 pages
13. Cosmic Structure, Averaging and Dark Energy
    David L. Wiltshire | arXiv, Published in 2013, 55 pages
14. Celestial Mechanics
    J. B. Tatum | , Published in 2008, 244 pages
15. Multi-messenger Astronomy and Dark Matter
    Las Bergstrom | arXiv, Published in 2012, 105 pages
16. Observations of the High Redshift Universe
    Richard S. Ellis | arXiv, Published in 2007, 115 pages
17. Introduction to Early Universe Cosmology
    Robert H. Brandenberger | arXiv, Published in 2011, 70 pages
18. Introduction to the Theory of Black Holes
    Gerard 't Hooft | Utrecht University, Published in 2009, 49 pages
19. Mechanism of the Heavens
    Mary Somerville | J. Murray, Published in 1831, 710 pages
20. Are We Alone?
    Gregg Easterbrook | The Atlantic Monthly, Published in 1988
21. General Astronomy
    Harold Spencer Jones | Edward Arnold and Company, Published in 1924, 392 pages
22. The Cosmic Web: Geometric Analysis
    Rien van de Weygaert, Willem Schaap | arXiv, Published in 2007, 129 pages
23. First Light
    Abraham Loeb | arXiv, Published in 2006, 157 pages
24. An Introduction to the Theory of Rotating Relativistic Stars
    Eric Gourgoulhon | arXiv, Published in 2010, 88 pages
25. Neutrinos and the Stars
    Georg Raffelt | arXiv, Published in 2012, 83 pages
26. The Virial Theorem in Stellar Astrophysics
    George W. Collins, II | Pachart Pub. House, Published in 1978, 135 pages
27. Astronomical Image and Data Analysis
    J.-L. Starck, F. Murtagh | Springer, Published in 2006, 335 pages
28. Cosmology
    V. A. Rubakov | arXiv.org, Published in 2018, 56 pages
29. Textbook on Practical Astronomy
    George Leonard Hosmer | Wiley, Published in 1910, 252 pages
30. An introductory treatise on the lunar theory
    Ernest W Brown | Cambridge University Press, Published in 1896, 312 pages
31. Astronomy with an Opera-glass
    Garrett Putman Serviss | D. Appleton & co., Published in 1890, 154 pages
32. Gravitational Wave Experiments and Early Universe Cosmology
    Michele Maggiore | arXiv, Published in 2000, 100 pages
33. Cosmology: Mankind's Grand Investigation
    Greg Bothun | Harcourt Brace College Publishers, Published in 1999, 129 pages
34. Mag 7 Star Atlas Project
    Andrew L. Johnson | , Published in 2007, 21 pages
35. A Handbook of Descriptive and Practical Astronomy
    George F. Chambers | Oxford At The Clarendon Press, Published in 1889, 756 pages
36. Inflationary Cosmology and Structure Formation
    J. A. Peacock | arXiv, Published in 1996, 77 pages
37. The Cosmological Constant
    Sean M. Carroll | arXiv, Published in 2000, 50 pages
38. Evolution of the Solar System
    Hannes Alfven, Gustaf Arrhenius | NASA, Published in 1976
39. Gravitational Wave Detection by Interferometry
    Matthew Pitkin, Stuart Reid, Sheila Rowan, Jim Hough | arXiv, Published in 2011, 80 pages
40. Frequently Asked Questions about Calendars
    Claus Tøndering | , Published in 2008, 65 pages
41. Cosmic Microwave Background Anisotropies up to Second Order
    Nicola Bartolo, Sabino Matarrese, Antonio Riotto | arXiv, Published in 2007, 53 pages
42. Introduction to Cosmology
    David H Lyth | arXiv, Published in 1993, 53 pages
43. A Text-book of Astronomy
    George C. Comstock | D. Appleton and company, Published in 1901, 391 pages
44. Large Scale Structure of the Universe
    Alison L. Coil | arXiv, Published in 2012, 43 pages
45. Big Bang Nucleosynthesis and Physics Beyond the Standard Model
    Subir Sarkar | arXiv, Published in 1996, 156 pages
46. The Astrobiology Primer: An Outline of General Knowledge
    Lucas J. Mix, at al. | arXiv, Published in 2006, 79 pages
47. Voyager Encounters Jupiter
    | National Aeronautics and Space Administration, Published in 1979, 48 pages
48. Recreations in Astronomy
    Henry White Warren | Project Gutenberg,
49. Superstring Cosmology
    James E. Lidsey, David Wands, E. J. Copeland | arXiv, Published in 2000, 161 pages
50. An Exposition on Inflationary Cosmology
    Scott Watson | arXiv, Published in 2000, 93 pages
51. The Shape of the Universe
    Gerd Pommerenke | viXra, Published in 2013, 321 pages
52. A Briefer History of Time: From the Big Bang to the Big Mac
    Eric Schulman | St. Martin's Press, Published in 2004, 207 pages
53. Planetary Photometry
    Max Fairbairn | , Published in 2005, 142 pages
54. Voyage to Jupiter
    David Morrison, Jane Samz | NASA, Published in 1980, 218 pages
55. Resources of Near-Earth Space
    J. S. Lewis, M. S. Matthews | University of Arizona Press, Published in 1993, 977 pages
56. Cosmology and Astrophysics
    Juan Garcia-Bellido | arXiv.org, Published in 2005, 76 pages
57. Pioneer Saturn Encounter
    | NASA, Published in 1979, 45 pages
58. Planetary Science: A Lunar Perspective
    Stuart Ross Taylor | Lunar and Planetary Institute, Published in 1982
59. 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
60. Voyager 1 and 2: Atlas of Six Saturnian Satellites
    Raymond M. Batson | NASA, Published in 1984, 182 pages
61. Atomic and Molecular Processes in Astronomy and Planetary Science
    Geoffrey A. Blake | California Institute of Technology, Published in 2004
62. A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
    Licia Verde | arXiv, Published in 2008, 52 pages
63. The Formation and Evolution of the Solar System
    James Schombert | University of Oregon, Published in 2007
64. Introductory Lectures on Quantum Cosmology
    J. J. Halliwell | arXiv, Published in 1990, 107 pages
65. A Simple Guide to Backyard Astronomy
    Carol Beigel | , Published in 2008, 61 pages
66. Mathematical Theories of Planetary Motions
    Otto Dziobek | The Register Pub. Co., Published in 1892, 314 pages
67. Astronomy
    Andrew Fraknoi, David Morrison, Sidney C. Wolff | Unglue.it, Published in 2016, 1200 pages
68. Handbook of Space Astronomy and Astrophysics
    Martin V. Zombeck | Cambridge University Press, Published in 2006, 780 pages
69. The Beginning and Evolution of the Universe
    Bharat Ratra, Michael S. Vogeley | arXiv, Published in 2008, 69 pages
70. Cosmology
    James Schombert | University of Oregon, Published in 2008
71. Lecture notes on the formation and early evolution of planetary systems
    Philip J. Armitage | arXiv, Published in 2010, 63 pages
72. Planetary Rings
    Matthew S. Tiscareno | arXiv, Published in 2011, 82 pages
73. Gravitational Waves: Sources, Detectors and Searches
    Keith Riles | arXiv, Published in 2012, 79 pages
74. Understanding Galaxy Formation and Evolution
    V. Avila-Reese | arXiv, Published in 2006, 50 pages
75. Observing the Sky from 40N
    Roberto Mura | Wikibooks, Published in 2010, 86 pages
76. Photographs of Nebulae and Clusters
    James Edward Keeler | University of California Publications, Published in 1908
77. Mysteries of the Sun
    Ginger Butcher | NASA, Published in 2011, 20 pages
78. TASI Lectures: Introduction to Cosmology
    Mark Trodden, Sean M. Carroll | arXiv, Published in 2004, 82 pages
79. Particle Physics Aspects of Modern Cosmology
    Robert H. Brandenberger | arXiv, Published in 1997, 70 pages
80. String Cosmology
    James M. Cline | arXiv, Published in 2007, 47 pages
81. An Introduction to Quantum Cosmology
    D.L. Wiltshire | arXiv, Published in 2003, 60 pages
82. Introduction to Dark Matter Experiments
    R. W. Schnee | arXiv.org, Published in 2011, 64 pages
83. Inflation and String Theory
    Daniel Baumann, Liam McAllister | arXiv, Published in 2014, 349 pages
84. Advances in Global and Local Helioseismology: an Introductory Review
    Alexander G. Kosovichev | arXiv, Published in 2011, 86 pages
85. The Astronomy of the Bible
    E. Walter Maunder | Richard Clay & Sons, Published in 1908
86. Lecture Notes on High Energy Cosmic Rays
    M. Kachelriess | arXiv.org, Published in 2008, 82 pages
87. Quantization in Astrophysics, Brownian Motion, and Supersymmetry
    F. Smarandache, V. Christianto | MathTiger, Published in 2007, 516 pages
88. Protostars and Planets
    | Rice University, Published in 2015, 422 pages
89. Telescopic Work for Starlight Evenings
    William F. Denning | Taylor and Francis, Published in 1891, 372 pages
90. Basaltic Volcanism on the Terrestrial Planets
    | Pergamon Press, Published in 1981, 1286 pages
91. Lectures on Inflation and Cosmological Perturbations
    David Langlois | arXiv, Published in 2010, 56 pages
92. The Hubble Constant
    Neal Jackson | arXiv, Published in 2014, 48 pages
93. Supernova Remnants: The X-ray Perspective
    Jacco Vink | arXiv, Published in 2011, 78 pages
94. Star-Gazer's Hand-Book
    Henry William Elson | Sturgis & Walton, Published in 1910, 72 pages
95. The Foundations of Celestial Mechanics
    George W. Collins, II | Pachart Pub House, Published in 2004, 145 pages
96. Observational Probes of Cosmic Acceleration
    David H. Weinberg, et al. | arXiv, Published in 2012, 253 pages
97. To a Rocky Moon: A Geologist's History of Lunar Exploration
    Don E. Wilhelms | University of Arizona Press, Published in 1993, 524 pages
98. Magnetic Fields, Strings and Cosmology
    Massimo Giovannini | arXiv, Published in 2006, 76 pages
99. Plasma Physics of Extreme Astrophysical Environments
    Dmitri A. Uzdensky, Shane Rightley | arXiv, Published in 2014, 56 pages
100. Cosmic Rays in Galactic and Extragalactic Magnetic Fields
     F. Aharonian, A. Bykov, E. Parizot, V. Ptuskin, A. Watson | arXiv, Published in 2011, 43 pages
101. Lectures on Black Holes, Topological Strings and Quantum Attractors
     Boris Pioline | arXiv, Published in 2007, 103 pages
102. Cosmic Rays and the Search for a Lorentz Invariance Violation
     Wolfgang Bietenholz | arXiv, Published in 2008, 81 pages
103. Modified Gravity and Cosmology
     T. Clifton, P.G. Ferreira, A. Padilla, C. Skordis | arXiv, Published in 2012, 312 pages
104. The Fundamentals of Stellar Astrophysics
     George W. Collins, II | W H Freeman & Co, Published in 2003, 494 pages
105. The Complete Idiot's Guide to The Sun
     Jay M. Pasachoff | Alpha, Published in 2003, 350 pages
106. An Introduction to Astronomy
     Forest Ray Moulton | The MacMillan Company, Published in 1916, 577 pages
107. The Universe in a Helium Droplet
     Grigory E. Volovik | Oxford University Press, Published in 2003, 532 pages
108. Great Astronomers
     Robert S. Ball | Isbister, Published in 1895, 392 pages
109. Through the Telescope
     James Baikie | Adam and Charles Black, Published in 1906, 303 pages
110. Cosmological Evolution of Galaxies
     Isaac Shlosman | arXiv, Published in 2012, 88 pages
111. An Expanded View of the Universe
     | European Southern Observatory, Published in 2011, 54 pages
112. Encyclopedia of Astrophysics
     Søren Bertil F. Dorch | Scholarpedia, Published in 2009
113. Why CMB physics?
     Massimo Giovannini | arXiv, Published in 2007, 179 pages
114. Black Holes
     P.K. Townsend | arXiv, Published in 1997, 145 pages
115. Lectures on Astronomy, Astrophysics, and Cosmology
     Luis A. Anchordoqui | arXiv, Published in 2007, 41 pages
116. Dark Energy: Observational Evidence and Theoretical Models
     B. Novosyadlyj, V. Pelykh, Yu. Shtanov, A. Zhuk | Akademperiodyka, Published in 2013, 380 pages
117. Notes on Stellar Astrophysics
     James N. Pierce | Minnesota State University, Published in 2013, 299 pages
118. Solar Neutrinos
     V. Antonelli, L. Miramonti, C. Pena-Garay, A. Serenelli | arXiv, Published in 2012, 51 pages
119. Galaxy systems in the optical and infrared
     A. Biviano | arXiv, Published in 2008, 60 pages
120. Practical Astronomy
     George L. Hosmer | John Wiley and Sons Inc., Published in 1925, 314 pages
121. High Energy Astrophysics
     Jonathan Katz | The Benjamin/Cummings Publishing, Published in 1986, 338 pages
122. Inflation
     Marieke Postma | NIKHEF, Published in 2009, 53 pages
123. Cosmic Journey: A History of Scientific Cosmology
     N. S. Hetherington, W. P. McCray | American Institute of Physics, Published in 2009, 344 pages
124. The History of Astrometry
     Michael Perryman | arXiv, Published in 2012, 52 pages
125. Cosmos and Culture: Cultural Evolution in a Cosmic Context
     Steven J. Dick, Mark L. Lupisella | NASA, Published in 2010, 612 pages
126. Stellar Superfluids
     Dany Page, et al. | arXiv, Published in 2013, 88 pages
127. General Astronomy
     | Wikibooks, Published in 2009
128. High Performance Computing and Numerical Modelling
     Volker Springel | arXiv, Published in 2014, 108 pages
129. From Cosmic Birth to Living Earths: The Future of UVOIR Space Astronomy
     Julianne Dalcanton, et al. | arXiv, Published in 2015, 176 pages
130. Spherical Astronomy
     F. Brünnow | Van Nostrand, Published in 1865, 559 pages
131. Introduction to Physical Astronomy
     Kenneth R. Koehler | University of Cincinnati, Published in 2010
132. To See the Unseen: A History of Planetary Radar Astronomy
     Andrew J. Butrica | NASA History Division, Published in 1996, 301 pages
133. The Telescope
     Louis Bell | McGraw-Hill, Published in 1922, 294 pages
134. Astronomy for Amateurs
     Camille Flammarion | D. Appleton and Company, Published in 1910
135. Mathematical Problems Of Radiative Equilibrium
     Eberhard Hopf | Cambridge University Press, Published in 1934, 123 pages
136. The Beginning and the End: The Meaning of Life in a Cosmological Perspective
     Clement Vidal | arXiv, Published in 2013, 356 pages
137. The Star Splitters: The High Energy Astronomy Observatories
     Wallace H. Tucker | NASA History Office, Published in 1984, 182 pages
138. Dynamics of the Universe in Problems
     Yu. L. Bolotin, et al. | UniverseInProblems.com, Published in 2013, 113 pages
139. The Birth And Death Of The Sun
     George Gamow | Dover Publications, Published in 1940, 256 pages
140. The Solar Magnetic Field
     Sami Solanki, Bernd Inhester, Manfred Schussler | arXiv, Published in 2010, 83 pages
141. Vision and Voyages for Planetary Science in the Decade 2013-2022
     | National Academy of Sciences, Published in 2011, 410 pages
142. Origin of the Moon
     W. K. Hartmann, R. J. Phillips, G. J. Taylor | Lunar and Planetary Institute, Published in 1986, 781 pages
143. When Biospheres Collide: A History of NASA's Planetary Protection Programs
     Michael Meltzer | NASA, Published in 2011, 542 pages
144. Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope
     Dylan Steele (ed.) | NASA, Published in 2015, 78 pages
145. Guidebook to the Geology of Barringer Meteorite Crater, Arizona
     David A. Kring | Lunar and Planetary Institute, Published in 2007, 154 pages
146. Dense Matter in Compact Stars
     Andreas Schmitt | arXiv, Published in 2010, 146 pages
147. Protoplanetary Disks and Their Evolution
     Jonathan P. Williams, Lucas A. Cieza | arXiv, Published in 2011, 65 pages
148. Pioneers of Science
     Oliver Lodge | Macmillan and co, Published in 1905, 421 pages
149. Practical Astronomy
     P. S. Michie, F. S. Harlow | John Wiley & Sons, Published in 1893, 246 pages
150. Galaxies and the Expanding Universe
     James Schombert | University of Oregon, Published in 2008
151. Images of the Solar Upper Atmosphere From SUMER on SOHO
     Uri Feldman, at al. | ESA Publications Division, Published in 2003, 209 pages
152. Traces of Catastrophe
     Bevan M French | Lunar and Planetary Institute, Published in 1998, 120 pages
153. Recent Developments in Gravitational Collapse and Spacetime Singularities
     Pankaj S. Joshi, Daniele Malafarina | arXiv, Published in 2012, 89 pages
154. Elementary Astronomy
     James N. Pierce | , Published in 2013, 134 pages
155. The Practical Astronomer
     Thomas Dick | Seeley, Burnside, and Seeley, Published in 1845, 588 pages
156. Massive Stars and their Supernovae
     F. Thielemann, R. Hirschi, M. Liebendorfer, R. Diehl | arXiv, Published in 2010, 81 pages
157. Stellar Atmospheres
     J. B. Tatum | , Published in 2006, 302 pages
158. Introduction to Supersymmetry: Astrophysical and Phenomenological Constraints
     Keith A. Olive | arXiv, Published in 1999, 67 pages
159. Cosmology: The Study of the Universe
     | NASA, Published in 2009, 38 pages
160. The Birth and Death of Stars
     James Schombert | University of Oregon, Published in 2008
161. Primordial Magnetogenesis
     Alejandra Kandus, Kerstin E. Kunze, Christos G. Tsagas | arXiv, Published in 2011, 107 pages
162. Introduction to Millimeter/Sub-Millimeter Astronomy
     T. L. Wilson | arXiv, Published in 2009, 106 pages
163. Ultrahigh Energy Cosmic Rays: Facts, Myths, and Legends
     Luis Alfredo Anchordoqui | arXiv, Published in 2011, 92 pages
164. An Introduction to Celestial Mechanics
     Richard Fitzpatrick | The University of Texas at Austin, Published in 2011, 216 pages
165. Astronuclear Physics: a Tale of the Atomic Nuclei in the Skies
     M. Arnould, S. Goriely | arXiv.org, Published in 2020, 100 pages
166. Introduction to Cosmology
     A. D. Dolgov | arXiv, Published in 2009, 58 pages
167. Applied Cosmography: A Pedagogical Review
     Yu. L. Bolotin, et al. | arXiv.org, Published in 2018, 66 pages
168. Moon Trip: A Personal Account of the Apollo Program and its Science
     Elbert A. King | Lunar and Planetary Institute, Published in 1989, 162 pages
169. A Review of the Universe: Structures, Evolutions, Observations, and Theories
     | universe-review.ca, Published in 2009
170. Special Functions: Fractional Calculus and the Pathway for Entropy
     Hans J. Haubold (ed.) | MDPI AG, Published in 2018, 306 pages
171. Voyager 1 Encounters Saturn
     | NASA, Published in 1980, 51 pages
172. Introduction to relativistic astrophysics and cosmology through Maple
     V. L. Kalashnikov | arXiv, Published in 2001, 124 pages
173. Introduction to Non-Baryonic Dark Matter
     Paolo Gondolo | arXiv, Published in 2004, 51 pages
174. Amateur Telescope Making
     | Springfield Telescope Makers Inc, Published in 2018, 428 pages
175. A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
     Mary Bourke, Heather Viles | Planetary Science Institute, Published in 2007, 88 pages
176. Sky Surveys
     S. G. Djorgovski, A.A. Mahabal, A.J. Drake, M.J. Graham, C. Donalek | arXiv, Published in 2012, 62 pages
177. Archaeology, Anthropology, and Interstellar Communication
     Douglas A. Vakoch | NASA, Published in 2014, 330 pages
178. Lunar Stratigraphy and Sedimentology
     John Lindsay | Elsevier, Published in 1976, 311 pages
179. From Disks to Planets
     Andrew N. Youdin, Scott J. Kenyon | arXiv, Published in 2012, 70 pages
180. A New Astronomy
     David Peck Todd | American Book Company, Published in 1906, 437 pages
181. The Geology of the Terrestrial Planets
     Michael H. Carr | NASA, Published in 1984, 322 pages
182. Short History of Astronomy
     Arthur Berry | John Murray, Published in 1898, 439 pages
183. The Galactic Habitable Zone I. Galactic Chemical Evolution
     G. Gonzalez, D. Brownlee, P. Ward | arXiv, Published in 2001, 57 pages
184. From Chaos to Consciousness: A Brief History of the Universe
     Mike Corwin | Bookboon, Published in 2015, 166 pages
185. Planetary Theory
     Ernest Brown, Clarence Shook | Cambridge University Press, Published in 1933, 323 pages
186. Space Nomads
     Leota Jean LaPaz, Lincoln LaPaz | Holiday House, Published in 1961, 199 pages
187. Consolidated Lunar Atlas
     Gerald P. Kuiper, et al. | Lunar and Planetary Institute, Published in 1960
188. Practical Astronomy for Engineers
     Frederick Hanley Seares | Stephens, Published in 1909, 160 pages
189. Advanced Topics in Cosmology: A Pedagogical Introduction
     T. Padmanabhan | arXiv, Published in 2006, 40 pages
190. Dwarf-Galaxy Cosmology
     Regina Schulte-Ladbeck, at al. | Hindawi Publishing, Published in 2010, 238 pages
191. Astrochemistry: The Issue of Molecular Complexity in Astrophysical Environments
     M. De Becker | arXiv, Published in 2013, 62 pages
192. The Story of Eclipses
     George F. Chambers | S. S. McClure Co., Published in 1909, 208 pages
193. Searching for Life Across Space and Time
     | The National Academies Press, Published in 2017, 133 pages
194. Black-Hole Phenomenology
     Neven Bilic | arXiv, Published in 2006, 58 pages
195. Exoplanet Observing for Amateurs
     Bruce L. Gary | Reductionist Publications, Published in 2007, 170 pages
196. A Primer for Black Hole Quantum Physics
     R. Brout, S. Massar, R. Parentani, P. Spindel | arXiv, Published in 2007, 178 pages
197. The First Stars
     Simon C. O. Glover | arXiv, Published in 2012, 72 pages
198. Chondrules and their Origins
     Elbert A. King | The Lunar and Planetary Institute, Published in 1983, 377 pages
199. Lopsided Spiral Galaxies
     Chanda J. Jog, Francoise Combes | arXiv, Published in 2008, 75 pages
200. The Elements of Theoretical and Descriptive Astronomy
     Charles J. White | J. Wiley, Published in 1909, 322 pages
201. On the Origin (and Evolution) of Baryonic Galaxy Halos
     Duncan A. Forbes, Ericson D. Lopez | MDPI AG, Published in 2018, 232 pages
202. An Introduction to Cosmic Rays and Gamma-Ray Bursts
     A. De Rujula | arXiv, Published in 2007, 37 pages
203. Ekpyrotic and Cyclic Cosmology
     Jean-Luc Lehners | arXiv, Published in 2009, 79 pages
204. Man's Place in the Universe
     Alfred R. Wallace | Chapman and Hall, Published in 1904, 330 pages
205. Hours With A Three-Inch Telescope
     William Noble | Longmans, Green & Co., Published in 1887, 159 pages
206. Cosmology for Particle Physicists
     U. A. Yajnik | arXiv, Published in 2008, 63 pages
207. Observatories in Space
     Catherine Turon | arXiv, Published in 2011, 50 pages
208. A Guide To The Constellations
     Samuel G. Barton | McGraw-Hill, Published in 1928, 96 pages
209. The Fine-Tuning of the Universe for Intelligent Life
     Luke A. Barnes | arXiv, Published in 2011, 76 pages
210. Elements of Astrophysics
     Nick Kaiser | University of Hawaii, Published in 2002, 435 pages
211. Astronomy of To-day
     Cecil Goodrich Julius Dolmage | Seeley and co., Published in 1910
212. Astronomical Discovery
     Herbert Hall Turner | E. Arnold, Published in 1904, 225 pages
213. Chemistry in Protoplanetary Disks
     Thomas Henning, Dmitry Semenov | arXiv, Published in 2013, 84 pages
214. History of Astronomy
     George Forbes | , Published in 1909
215. Lunar Orbiter Photographic Atlas of the Moon
     D.E. Hughes, J.K. Bowker | Lunar and Planetary Institute, Published in 1971
216. Habitable Planets for Man
     Stephen H. Dole | RAND Corporation, Published in 1964, 176 pages
217. Gamma-Ray Bursts: Progress, Problems and Prospects
     Bing Zhang, Peter Meszaros | arXiv, Published in 2008, 87 pages
218. Radiative Gas Dynamics
     David Weinberg | Ohio State University, Published in 2007
219. An Introduction to Galactic Chemical Evolution
     Nikos Prantzos | arXiv, Published in 2007, 46 pages
220. Observing the Sky from 30S
     Roberto Mura | Wikibooks, Published in 2010, 86 pages
221. Atlas of Peculiar Galaxies
     Halton C. Arp | California Institute of Technology, Published in 1966, 190 pages
222. Everything You Always Wanted To Know About The Cosmological Constant Problem
     Jerome Martin | arXiv, Published in 2012, 89 pages
223. Celestial Navigation, Elementary Astronomy, Piloting
     Arturo Chiesa, Raffaele Chiesa | Sky and Sea Software, Published in 2010
224. Advances in Modern Cosmology
     Adnan Ghribi | InTech, Published in 2011, 198 pages
225. Primer Of Celestial Navigation
     John Favill | Cornell Maritime Press, Published in 1944, 300 pages
226. The Search for Extraterrestrial Intelligence, SETI
     Philip Morrison, John Billingham, John Wolfe | NASA, Published in 1979, 293 pages
227. Particle Physics and Inflationary Cosmology
     Andrei Linde | arXiv, Published in 2005, 270 pages
228. Celestial Mechanics: Notes and Work
     J.D. Mireles James | Rutgers University, Published in 2007, 128 pages
229. Views of the Solar System
     Calvin J. Hamilton | , Published in 2008
230. An Introduction into the Theory of Cosmological Structure Formation
     Christian Knobel | arXiv, Published in 2012, 102 pages