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