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