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