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. Cosmology
   James Schombert | University of Oregon, Published in 2008, 123 pages
2. Observing the Sky from 30S
   Roberto Mura | Wikibooks, Published in 2010, 86 pages
3. Chondrules and their Origins
   Elbert A. King | The Lunar and Planetary Institute, Published in 1983, 377 pages
4. The Cosmological Constant
   Sean M. Carroll | arXiv, Published in 2000, 50 pages
5. An Introduction to Galactic Chemical Evolution
   Nikos Prantzos | arXiv, Published in 2007, 46 pages
6. Introduction to the Theory of Black Holes
   Gerard 't Hooft | Utrecht University, Published in 2009, 49 pages
7. A Practical Introduction to Numerical Hydrodynamics
   Garrelt Mellema | Leiden University, Published in 2003, 124 pages
8. Cosmic Rays in Galactic and Extragalactic Magnetic Fields
   F. Aharonian, A. Bykov, E. Parizot, V. Ptuskin, A. Watson | arXiv, Published in 2011, 43 pages
9. Advanced Topics in Cosmology: A Pedagogical Introduction
   T. Padmanabhan | arXiv, Published in 2006, 40 pages
10. When Biospheres Collide: A History of NASA's Planetary Protection Programs
    Michael Meltzer | NASA, Published in 2011, 542 pages
11. Quantization in Astrophysics, Brownian Motion, and Supersymmetry
    F. Smarandache, V. Christianto | MathTiger, Published in 2007, 516 pages
12. Stellar Superfluids
    Dany Page, et al. | arXiv, Published in 2013, 88 pages
13. An introductory treatise on the lunar theory
    Ernest W Brown | Cambridge University Press, Published in 1896, 312 pages
14. Mathematical Theories of Planetary Motions
    Otto Dziobek | The Register Pub. Co., Published in 1892, 314 pages
15. Particle Physics and Inflationary Cosmology
    Andrei Linde | arXiv, Published in 2005, 270 pages
16. Recent Developments in Gravitational Collapse and Spacetime Singularities
    Pankaj S. Joshi, Daniele Malafarina | arXiv, Published in 2012, 89 pages
17. An Introduction to Cosmic Rays and Gamma-Ray Bursts
    A. De Rujula | arXiv, Published in 2007, 37 pages
18. Telescopic Work for Starlight Evenings
    William F. Denning | Taylor and Francis, Published in 1891, 372 pages
19. Practical Astronomy
    P. S. Michie, F. S. Harlow | John Wiley & Sons, Published in 1893, 246 pages
20. Cosmic Microwave Background Anisotropies up to Second Order
    Nicola Bartolo, Sabino Matarrese, Antonio Riotto | arXiv, Published in 2007, 53 pages
21. Understanding Galaxy Formation and Evolution
    V. Avila-Reese | arXiv, Published in 2006, 50 pages
22. Introduction to Physical Astronomy
    Kenneth R. Koehler | University of Cincinnati, Published in 2010
23. The Fine-Tuning of the Universe for Intelligent Life
    Luke A. Barnes | arXiv, Published in 2011, 76 pages
24. Vision and Voyages for Planetary Science in the Decade 2013-2022
    | National Academy of Sciences, Published in 2011, 410 pages
25. Big Bang Nucleosynthesis and Physics Beyond the Standard Model
    Subir Sarkar | arXiv, Published in 1996, 156 pages
26. Hours With A Three-Inch Telescope
    William Noble | Longmans, Green & Co., Published in 1887, 159 pages
27. Evolution of the Solar System
    Hannes Alfven, Gustaf Arrhenius | NASA, Published in 1976, 583 pages
28. Through the Telescope
    James Baikie | Adam and Charles Black, Published in 1906, 303 pages
29. Introduction to Cosmology
    David H Lyth | arXiv, Published in 1993, 53 pages
30. Lecture Notes on High Energy Cosmic Rays
    M. Kachelriess | arXiv.org, Published in 2008, 82 pages
31. Origin of the Moon
    W. K. Hartmann, R. J. Phillips, G. J. Taylor | Lunar and Planetary Institute, Published in 1986, 781 pages
32. Cosmic Rays and the Search for a Lorentz Invariance Violation
    Wolfgang Bietenholz | arXiv, Published in 2008, 81 pages
33. The Cosmic Web: Geometric Analysis
    Rien van de Weygaert, Willem Schaap | arXiv, Published in 2007, 129 pages
34. Celestial Navigation, Elementary Astronomy, Piloting
    Arturo Chiesa, Raffaele Chiesa | Sky and Sea Software, Published in 2010
35. Voyager 1 Encounters Saturn
    | NASA, Published in 1980, 51 pages
36. Spherical Astronomy
    F. Brünnow | Van Nostrand, Published in 1865, 559 pages
37. Consolidated Lunar Atlas
    Gerald P. Kuiper, et al. | Lunar and Planetary Institute, Published in 1960
38. Satellites of Jupiter
    David Morrison | University of Arizona Press, Published in 1982, 983 pages
39. Observatories in Space
    Catherine Turon | arXiv, Published in 2011, 50 pages
40. Curiosities of the Sky
    Garrett Putman Serviss | Harper & Brothers, Published in 1909, 300 pages
41. Atomic and Molecular Processes in Astronomy and Planetary Science
    Geoffrey A. Blake | California Institute of Technology, Published in 2004
42. Mag 7 Star Atlas Project
    Andrew L. Johnson | , Published in 2007, 21 pages
43. Supernova Cosmology: Legacy and Future
    Ariel Goobar, Bruno Leibundgut | arXiv, Published in 2011, 62 pages
44. Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope
    Dylan Steele (ed.) | NASA, Published in 2015, 78 pages
45. An Expanded View of the Universe
    | European Southern Observatory, Published in 2011, 54 pages
46. Astrochemistry: The Issue of Molecular Complexity in Astrophysical Environments
    M. De Becker | arXiv, Published in 2013, 62 pages
47. Cosmos and Culture: Cultural Evolution in a Cosmic Context
    Steven J. Dick, Mark L. Lupisella | NASA, Published in 2010, 612 pages
48. Practical Astronomy
    George L. Hosmer | John Wiley and Sons Inc., Published in 1925, 314 pages
49. Galaxy systems in the optical and infrared
    A. Biviano | arXiv, Published in 2008, 60 pages
50. Multi-messenger Astronomy and Dark Matter
    Las Bergstrom | arXiv, Published in 2012, 105 pages
51. The Foundations of Celestial Mechanics
    George W. Collins, II | Pachart Pub House, Published in 2004, 145 pages
52. Moon Trip: A Personal Account of the Apollo Program and its Science
    Elbert A. King | Lunar and Planetary Institute, Published in 1989, 162 pages
53. Astronomical Discovery
    Herbert Hall Turner | E. Arnold, Published in 1904, 225 pages
54. Traces of Catastrophe
    Bevan M French | Lunar and Planetary Institute, Published in 1998, 120 pages
55. Inflation and String Theory
    Daniel Baumann, Liam McAllister | arXiv, Published in 2014, 349 pages
56. The Beginning and the End: The Meaning of Life in a Cosmological Perspective
    Clement Vidal | arXiv, Published in 2013, 356 pages
57. Lectures on Inflation and Cosmological Perturbations
    David Langlois | arXiv, Published in 2010, 56 pages
58. Chemistry in Protoplanetary Disks
    Thomas Henning, Dmitry Semenov | arXiv, Published in 2013, 84 pages
59. Protostars and Planets
    | Rice University, Published in 2015, 422 pages
60. Gravitational Wave Experiments and Early Universe Cosmology
    Michele Maggiore | arXiv, Published in 2000, 100 pages
61. The Galactic Habitable Zone I. Galactic Chemical Evolution
    G. Gonzalez, D. Brownlee, P. Ward | arXiv, Published in 2001, 57 pages
62. Introduction to Early Universe Cosmology
    Robert H. Brandenberger | arXiv, Published in 2011, 70 pages
63. Recreations in Astronomy
    Henry White Warren | Project Gutenberg,
64. A Simple Guide to Backyard Astronomy
    Carol Beigel | , Published in 2008, 61 pages
65. Planetary Science: A Lunar Perspective
    Stuart Ross Taylor | Lunar and Planetary Institute, Published in 1982
66. Dark Energy: Observational Evidence and Theoretical Models
    B. Novosyadlyj, V. Pelykh, Yu. Shtanov, A. Zhuk | Akademperiodyka, Published in 2013, 380 pages
67. Voyager 1 and 2: Atlas of Six Saturnian Satellites
    Raymond M. Batson | NASA, Published in 1984, 182 pages
68. To See the Unseen: A History of Planetary Radar Astronomy
    Andrew J. Butrica | NASA History Division, Published in 1996, 301 pages
69. General Astronomy
    | Wikibooks, Published in 2009
70. Images of the Solar Upper Atmosphere From SUMER on SOHO
    Uri Feldman, at al. | ESA Publications Division, Published in 2003, 209 pages
71. Lunar Stratigraphy and Sedimentology
    John Lindsay | Elsevier, Published in 1976, 311 pages
72. Guidebook to the Geology of Barringer Meteorite Crater, Arizona
    David A. Kring | Lunar and Planetary Institute, Published in 2007, 154 pages
73. Astronomy
    Andrew Fraknoi, David Morrison, Sidney C. Wolff | Unglue.it, Published in 2016, 1200 pages
74. Cosmology Primer
    Sean Carroll | preposterousuniverse.com, Published in 2012, 120 pages
75. Star-Gazer's Hand-Book
    Henry William Elson | Sturgis & Walton, Published in 1910, 72 pages
76. Celestial Mechanics
    J. B. Tatum | , Published in 2008, 244 pages
77. Introduction to Dark Matter Experiments
    R. W. Schnee | arXiv.org, Published in 2011, 64 pages
78. Special Functions: Fractional Calculus and the Pathway for Entropy
    Hans J. Haubold (ed.) | MDPI AG, Published in 2018, 306 pages
79. Primer Of Celestial Navigation
    John Favill | Cornell Maritime Press, Published in 1944, 300 pages
80. Cosmic Structure, Averaging and Dark Energy
    David L. Wiltshire | arXiv, Published in 2013, 55 pages
81. Everything You Always Wanted To Know About The Cosmological Constant Problem
    Jerome Martin | arXiv, Published in 2012, 89 pages
82. Gamma-Ray Bursts: Progress, Problems and Prospects
    Bing Zhang, Peter Meszaros | arXiv, Published in 2008, 87 pages
83. Amateur Telescope Making
    | Springfield Telescope Makers Inc, Published in 2018, 428 pages
84. Basaltic Volcanism on the Terrestrial Planets
    | Pergamon Press, Published in 1981, 1286 pages
85. Sky Surveys
    S. G. Djorgovski, A.A. Mahabal, A.J. Drake, M.J. Graham, C. Donalek | arXiv, Published in 2012, 62 pages
86. Cluster Lenses
    Jean-Paul Kneib, Priyamvada Natarajan | arXiv, Published in 2012, 120 pages
87. Advances in Global and Local Helioseismology: an Introductory Review
    Alexander G. Kosovichev | arXiv, Published in 2011, 86 pages
88. Radiative Gas Dynamics
    David Weinberg | Ohio State University, Published in 2007
89. Inflationary Cosmology and Structure Formation
    J. A. Peacock | arXiv, Published in 1996, 77 pages
90. A Guide To The Constellations
    Samuel G. Barton | McGraw-Hill, Published in 1928, 96 pages
91. Voyager Encounters Jupiter
    | National Aeronautics and Space Administration, Published in 1979, 48 pages
92. The Birth and Death of Stars
    James Schombert | University of Oregon, Published in 2008, 324 pages
93. Pioneer Saturn Encounter
    | NASA, Published in 1979, 45 pages
94. Primordial Magnetogenesis
    Alejandra Kandus, Kerstin E. Kunze, Christos G. Tsagas | arXiv, Published in 2011, 107 pages
95. The Hubble Constant
    Neal Jackson | arXiv, Published in 2014, 48 pages
96. An Introduction into the Theory of Cosmological Structure Formation
    Christian Knobel | arXiv, Published in 2012, 102 pages
97. The Practical Astronomer
    Thomas Dick | Seeley, Burnside, and Seeley, Published in 1845, 588 pages
98. History of Astronomy
    George Forbes | , Published in 1909
99. Massive Stars and their Supernovae
    F. Thielemann, R. Hirschi, M. Liebendorfer, R. Diehl | arXiv, Published in 2010, 81 pages
100. From Chaos to Consciousness: A Brief History of the Universe
     Mike Corwin | Bookboon, Published in 2015, 166 pages
101. From Disks to Planets
     Andrew N. Youdin, Scott J. Kenyon | arXiv, Published in 2012, 70 pages
102. Astronomy for Amateurs
     Camille Flammarion | D. Appleton and Company, Published in 1910
103. Space Nomads
     Leota Jean LaPaz, Lincoln LaPaz | Holiday House, Published in 1961, 199 pages
104. Habitable Planets for Man
     Stephen H. Dole | RAND Corporation, Published in 1964, 176 pages
105. A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
     Licia Verde | arXiv, Published in 2008, 52 pages
106. The Astrobiology Primer: An Outline of General Knowledge
     Lucas J. Mix, at al. | arXiv, Published in 2006, 79 pages
107. Planetary Theory
     Ernest Brown, Clarence Shook | Cambridge University Press, Published in 1933, 323 pages
108. Handbook of Space Astronomy and Astrophysics
     Martin V. Zombeck | Cambridge University Press, Published in 2006, 780 pages
109. String Cosmology
     James M. Cline | arXiv, Published in 2007, 47 pages
110. A Primer for Black Hole Quantum Physics
     R. Brout, S. Massar, R. Parentani, P. Spindel | arXiv, Published in 2007, 178 pages
111. Introduction to Non-Baryonic Dark Matter
     Paolo Gondolo | arXiv, Published in 2004, 51 pages
112. A New Astronomy
     David Peck Todd | American Book Company, Published in 1906, 437 pages
113. Voyage to Jupiter
     David Morrison, Jane Samz | NASA, Published in 1980, 218 pages
114. To a Rocky Moon: A Geologist's History of Lunar Exploration
     Don E. Wilhelms | University of Arizona Press, Published in 1993, 524 pages
115. Applied Cosmography: A Pedagogical Review
     Yu. L. Bolotin, et al. | arXiv.org, Published in 2018, 66 pages
116. Cosmological Evolution of Galaxies
     Isaac Shlosman | arXiv, Published in 2012, 88 pages
117. Elementary Astronomy
     James N. Pierce | , Published in 2013, 134 pages
118. Encyclopedia of Astrophysics
     Søren Bertil F. Dorch | Scholarpedia, Published in 2009
119. Advances in Modern Cosmology
     Adnan Ghribi | InTech, Published in 2011, 198 pages
120. High Energy Astrophysics
     Jonathan Katz | The Benjamin/Cummings Publishing, Published in 1986, 338 pages
121. Cosmic Journey: A History of Scientific Cosmology
     N. S. Hetherington, W. P. McCray | American Institute of Physics, Published in 2009, 344 pages
122. Astronomical Image and Data Analysis
     J.-L. Starck, F. Murtagh | Springer, Published in 2006, 335 pages
123. Galaxies and the Expanding Universe
     James Schombert | University of Oregon, Published in 2008, 146 pages
124. Searching for Life Across Space and Time
     | The National Academies Press, Published in 2017, 133 pages
125. An Introduction to Celestial Mechanics
     Richard Fitzpatrick | The University of Texas at Austin, Published in 2011, 216 pages
126. An Introduction to the Theory of Rotating Relativistic Stars
     Eric Gourgoulhon | arXiv, Published in 2010, 88 pages
127. Gravitational Wave Detection by Interferometry
     Matthew Pitkin, Stuart Reid, Sheila Rowan, Jim Hough | arXiv, Published in 2011, 80 pages
128. Dense Matter in Compact Stars
     Andreas Schmitt | arXiv, Published in 2010, 146 pages
129. The world according to the Hubble Space Telescope
     Mario Livio | arXiv.org, Published in 2008, 112 pages
130. Solar Neutrinos
     V. Antonelli, L. Miramonti, C. Pena-Garay, A. Serenelli | arXiv, Published in 2012, 51 pages
131. Lopsided Spiral Galaxies
     Chanda J. Jog, Francoise Combes | arXiv, Published in 2008, 75 pages
132. Protoplanetary Disks and Their Evolution
     Jonathan P. Williams, Lucas A. Cieza | arXiv, Published in 2011, 65 pages
133. An Introduction to Celestial Mechanics
     Forest Ray Moulton | The MacMillan Company, Published in 1914, 437 pages
134. Mercury
     F. Vilas, C. Chapman, M. Matthews | University of Arizona Press, Published in 1989, 794 pages
135. A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
     Mary Bourke, Heather Viles | Planetary Science Institute, Published in 2007, 88 pages
136. Neutrinos and the Stars
     Georg Raffelt | arXiv, Published in 2012, 83 pages
137. Mathematical Problems Of Radiative Equilibrium
     Eberhard Hopf | Cambridge University Press, Published in 1934, 123 pages
138. An Exposition on Inflationary Cosmology
     Scott Watson | arXiv, Published in 2000, 93 pages
139. Short History of Astronomy
     Arthur Berry | John Murray, Published in 1898, 439 pages
140. Introduction to Supersymmetry: Astrophysical and Phenomenological Constraints
     Keith A. Olive | arXiv, Published in 1999, 67 pages
141. Radiative Processes in High Energy Astrophysics
     Gabriele Ghisellini | arXiv, Published in 2012, 157 pages
142. Lecture notes on the formation and early evolution of planetary systems
     Philip J. Armitage | arXiv, Published in 2010, 63 pages
143. Mechanism of the Heavens
     Mary Somerville | J. Murray, Published in 1831, 710 pages
144. Observations of the High Redshift Universe
     Richard S. Ellis | arXiv, Published in 2007, 115 pages
145. Lectures on Black Holes, Topological Strings and Quantum Attractors
     Boris Pioline | arXiv, Published in 2007, 103 pages
146. TASI Lectures: Introduction to Cosmology
     Mark Trodden, Sean M. Carroll | arXiv, Published in 2004, 82 pages
147. A Review of the Universe: Structures, Evolutions, Observations, and Theories
     | universe-review.ca, Published in 2009
148. Large Scale Structure of the Universe
     Alison L. Coil | arXiv, Published in 2012, 43 pages
149. Techniques of Radio Astronomy
     T. L. Wilson | arXiv, Published in 2011, 47 pages
150. Astronomy with an Opera-glass
     Garrett Putman Serviss | D. Appleton & co., Published in 1890, 154 pages
151. On the Origin (and Evolution) of Baryonic Galaxy Halos
     Duncan A. Forbes, Ericson D. Lopez | MDPI AG, Published in 2018, 232 pages
152. Planetary Photometry
     Max Fairbairn | , Published in 2005, 142 pages
153. Resources of Near-Earth Space
     J. S. Lewis, M. S. Matthews | University of Arizona Press, Published in 1993, 977 pages
154. The Beginning and Evolution of the Universe
     Bharat Ratra, Michael S. Vogeley | arXiv, Published in 2008, 69 pages
155. The Complete Idiot's Guide to The Sun
     Jay M. Pasachoff | Alpha, Published in 2003, 350 pages
156. The Shape of the Universe
     Gerd Pommerenke | viXra, Published in 2013, 321 pages
157. Are We Alone?
     Gregg Easterbrook | The Atlantic Monthly, Published in 1988
158. Lunar Orbiter Photographic Atlas of the Moon
     D.E. Hughes, J.K. Bowker | Lunar and Planetary Institute, Published in 1971
159. Astronomy Notes
     Nick Strobel | astronomynotes.com, Published in 2010
160. Ultrahigh Energy Cosmic Rays: Facts, Myths, and Legends
     Luis Alfredo Anchordoqui | arXiv, Published in 2011, 92 pages
161. High Performance Computing and Numerical Modelling
     Volker Springel | arXiv, Published in 2014, 108 pages
162. Superstring Cosmology
     James E. Lidsey, David Wands, E. J. Copeland | arXiv, Published in 2000, 161 pages
163. Black Holes
     P.K. Townsend | arXiv, Published in 1997, 145 pages
164. Introduction to relativistic astrophysics and cosmology through Maple
     V. L. Kalashnikov | arXiv, Published in 2001, 124 pages
165. A Text-book of Astronomy
     George C. Comstock | D. Appleton and company, Published in 1901, 391 pages
166. Cosmology: Mankind's Grand Investigation
     Greg Bothun | Harcourt Brace College Publishers, Published in 1999, 129 pages
167. Introductory Lectures on Quantum Cosmology
     J. J. Halliwell | arXiv, Published in 1990, 107 pages
168. The Telescope
     Louis Bell | McGraw-Hill, Published in 1922, 294 pages
169. Why CMB physics?
     Massimo Giovannini | arXiv, Published in 2007, 179 pages
170. Notes on Stellar Astrophysics
     James N. Pierce | Minnesota State University, Published in 2013, 299 pages
171. Celestial Mechanics: Notes and Work
     J.D. Mireles James | Rutgers University, Published in 2007, 128 pages
172. Inflation
     Marieke Postma | NIKHEF, Published in 2009, 53 pages
173. A Briefer History of Time: From the Big Bang to the Big Mac
     Eric Schulman | St. Martin's Press, Published in 2004, 207 pages
174. The Formation and Evolution of the Solar System
     James Schombert | University of Oregon, Published in 2007, 233 pages
175. Great Astronomers
     Robert S. Ball | Isbister, Published in 1895, 392 pages
176. The Star Splitters: The High Energy Astronomy Observatories
     Wallace H. Tucker | NASA History Office, Published in 1984, 182 pages
177. Archaeology, Anthropology, and Interstellar Communication
     Douglas A. Vakoch | NASA, Published in 2014, 330 pages
178. Astronomy of To-day
     Cecil Goodrich Julius Dolmage | Seeley and co., Published in 1910
179. Cosmology and Astrophysics
     Juan Garcia-Bellido | arXiv.org, Published in 2005, 76 pages
180. The Elements of Theoretical and Descriptive Astronomy
     Charles J. White | J. Wiley, Published in 1909, 322 pages
181. Practical Astronomy for Engineers
     Frederick Hanley Seares | Stephens, Published in 1909, 160 pages
182. Dynamics of the Universe in Problems
     Yu. L. Bolotin, et al. | UniverseInProblems.com, Published in 2013, 113 pages
183. Introduction to Cosmology
     A. D. Dolgov | arXiv, Published in 2009, 58 pages
184. The Birth And Death Of The Sun
     George Gamow | Dover Publications, Published in 1940, 256 pages
185. Frequently Asked Questions about Calendars
     Claus Tøndering | , Published in 2008, 65 pages
186. Cosmology for Particle Physicists
     U. A. Yajnik | arXiv, Published in 2008, 63 pages
187. An Introduction to Astronomy
     Forest Ray Moulton | The MacMillan Company, Published in 1916, 577 pages
188. The Solar Magnetic Field
     Sami Solanki, Bernd Inhester, Manfred Schussler | arXiv, Published in 2010, 83 pages
189. Particle Physics Aspects of Modern Cosmology
     Robert H. Brandenberger | arXiv, Published in 1997, 70 pages
190. From Cosmic Birth to Living Earths: The Future of UVOIR Space Astronomy
     Julianne Dalcanton, et al. | arXiv, Published in 2015, 176 pages
191. The History of Astrometry
     Michael Perryman | arXiv, Published in 2012, 52 pages
192. Mysteries of the Sun
     Ginger Butcher | NASA, Published in 2012, 22 pages
193. Observing the Sky from 40N
     Roberto Mura | Wikibooks, Published in 2010, 86 pages
194. Supernova Remnants: The X-ray Perspective
     Jacco Vink | arXiv, Published in 2011, 78 pages
195. The Geology of the Terrestrial Planets
     Michael H. Carr | NASA, Published in 1984, 322 pages
196. Cosmology
     V. A. Rubakov | arXiv.org, Published in 2018, 56 pages
197. Modified Gravity and Cosmology
     T. Clifton, P.G. Ferreira, A. Padilla, C. Skordis | arXiv, Published in 2012, 312 pages
198. Plasma Physics of Extreme Astrophysical Environments
     Dmitri A. Uzdensky, Shane Rightley | arXiv, Published in 2014, 56 pages
199. Atlas of Peculiar Galaxies
     Halton C. Arp | California Institute of Technology, Published in 1966, 190 pages
200. Observational Probes of Cosmic Acceleration
     David H. Weinberg, et al. | arXiv, Published in 2012, 253 pages
201. Cosmology: The Study of the Universe
     | NASA, Published in 2009, 38 pages
202. Pioneers of Science
     Oliver Lodge | Macmillan and co, Published in 1905, 421 pages
203. The Fundamentals of Stellar Astrophysics
     George W. Collins, II | W H Freeman & Co, Published in 2003, 494 pages
204. The Astronomy of the Bible
     E. Walter Maunder | Richard Clay & Sons, Published in 1908
205. Black-Hole Phenomenology
     Neven Bilic | arXiv, Published in 2006, 58 pages
206. Lectures on Astronomy, Astrophysics, and Cosmology
     Luis A. Anchordoqui | arXiv, Published in 2007, 41 pages
207. General Astronomy
     Harold Spencer Jones | Edward Arnold and Company, Published in 1924, 392 pages
208. Dwarf-Galaxy Cosmology
     Regina Schulte-Ladbeck, at al. | Hindawi Publishing, Published in 2010, 238 pages
209. A Handbook of Descriptive and Practical Astronomy
     George F. Chambers | Oxford At The Clarendon Press, Published in 1889, 756 pages
210. Introduction to Millimeter/Sub-Millimeter Astronomy
     T. L. Wilson | arXiv, Published in 2009, 106 pages
211. Man's Place in the Universe
     Alfred R. Wallace | Chapman and Hall, Published in 1904, 330 pages
212. Astronuclear Physics: a Tale of the Atomic Nuclei in the Skies
     M. Arnould, S. Goriely | arXiv.org, Published in 2020, 100 pages
213. The Search for Extraterrestrial Intelligence, SETI
     Philip Morrison, John Billingham, John Wolfe | NASA, Published in 1979, 293 pages
214. Gravitational Waves: Sources, Detectors and Searches
     Keith Riles | arXiv, Published in 2012, 79 pages
215. An Introduction to Quantum Cosmology
     D.L. Wiltshire | arXiv, Published in 2003, 60 pages
216. Ekpyrotic and Cyclic Cosmology
     Jean-Luc Lehners | arXiv, Published in 2009, 79 pages
217. 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
218. The Story of Eclipses
     George F. Chambers | S. S. McClure Co., Published in 1909, 208 pages
219. The First Stars
     Simon C. O. Glover | arXiv, Published in 2012, 72 pages
220. Elements of Astrophysics
     Nick Kaiser | University of Hawaii, Published in 2002, 435 pages
221. Magnetic Fields, Strings and Cosmology
     Massimo Giovannini | arXiv, Published in 2006, 76 pages
222. Exoplanet Observing for Amateurs
     Bruce L. Gary | Reductionist Publications, Published in 2007, 170 pages
223. The Universe in a Helium Droplet
     Grigory E. Volovik | Oxford University Press, Published in 2003, 532 pages
224. Planetary Rings
     Matthew S. Tiscareno | arXiv, Published in 2011, 82 pages
225. Textbook on Practical Astronomy
     George Leonard Hosmer | Wiley, Published in 1910, 252 pages
226. The Virial Theorem in Stellar Astrophysics
     George W. Collins, II | Pachart Pub. House, Published in 1978, 135 pages
227. Elementary Mathematical Astronomy
     C. Barlow, G. Bryan | University Correspondence College Press, Published in 1893, 442 pages
228. Photographs of Nebulae and Clusters
     James Edward Keeler | University of California Publications, Published in 1908
229. Views of the Solar System
     Calvin J. Hamilton | , Published in 2008
230. Stellar Atmospheres
     J. B. Tatum | , Published in 2006, 302 pages
231. First Light
     Abraham Loeb | arXiv, Published in 2006, 157 pages