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. Recent Developments in Gravitational Collapse and Spacetime Singularities
   Pankaj S. Joshi, Daniele Malafarina | arXiv, Published in 2012, 89 pages
2. Resources of Near-Earth Space
   J. S. Lewis, M. S. Matthews | University of Arizona Press, Published in 1993, 977 pages
3. Lunar Stratigraphy and Sedimentology
   John Lindsay | Elsevier, Published in 1976, 311 pages
4. Understanding Galaxy Formation and Evolution
   V. Avila-Reese | arXiv, Published in 2006, 50 pages
5. Advances in Global and Local Helioseismology: an Introductory Review
   Alexander G. Kosovichev | arXiv, Published in 2011, 86 pages
6. The Elements of Theoretical and Descriptive Astronomy
   Charles J. White | J. Wiley, Published in 1909, 322 pages
7. Gamma-Ray Bursts: Progress, Problems and Prospects
   Bing Zhang, Peter Meszaros | arXiv, Published in 2008, 87 pages
8. Textbook on Practical Astronomy
   George Leonard Hosmer | Wiley, Published in 1910, 252 pages
9. Consolidated Lunar Atlas
   Gerald P. Kuiper, et al. | Lunar and Planetary Institute, Published in 1960
10. An Introduction to Galactic Chemical Evolution
    Nikos Prantzos | arXiv, Published in 2007, 46 pages
11. Practical Astronomy for Engineers
    Frederick Hanley Seares | Stephens, Published in 1909, 160 pages
12. Introduction to Non-Baryonic Dark Matter
    Paolo Gondolo | arXiv, Published in 2004, 51 pages
13. Origin of the Moon
    W. K. Hartmann, R. J. Phillips, G. J. Taylor | Lunar and Planetary Institute, Published in 1986, 781 pages
14. Gravitational Wave Detection by Interferometry
    Matthew Pitkin, Stuart Reid, Sheila Rowan, Jim Hough | arXiv, Published in 2011, 80 pages
15. Mathematical Problems Of Radiative Equilibrium
    Eberhard Hopf | Cambridge University Press, Published in 1934, 123 pages
16. Evolution of the Solar System
    Hannes Alfven, Gustaf Arrhenius | NASA, Published in 1976
17. Observing the Sky from 30S
    Roberto Mura | Wikibooks, Published in 2010, 86 pages
18. Mercury
    F. Vilas, C. Chapman, M. Matthews | University of Arizona Press, Published in 1989, 794 pages
19. Multi-messenger Astronomy and Dark Matter
    Las Bergstrom | arXiv, Published in 2012, 105 pages
20. Lecture Notes on High Energy Cosmic Rays
    M. Kachelriess | arXiv.org, Published in 2008, 82 pages
21. Are We Alone?
    Gregg Easterbrook | The Atlantic Monthly, Published in 1988
22. Space Nomads
    Leota Jean LaPaz, Lincoln LaPaz | Holiday House, Published in 1961, 199 pages
23. Inflationary Cosmology and Structure Formation
    J. A. Peacock | arXiv, Published in 1996, 77 pages
24. Advanced Topics in Cosmology: A Pedagogical Introduction
    T. Padmanabhan | arXiv, Published in 2006, 40 pages
25. Planetary Rings
    Matthew S. Tiscareno | arXiv, Published in 2011, 82 pages
26. Primer Of Celestial Navigation
    John Favill | Cornell Maritime Press, Published in 1944, 300 pages
27. Trans-Neptunian Objects: An Overview
    | Wikipedia, Published in 2014
28. Cosmology
    James Schombert | University of Oregon, Published in 2008
29. An Introduction into the Theory of Cosmological Structure Formation
    Christian Knobel | arXiv, Published in 2012, 102 pages
30. Hubble Space Telescope: Discoveries
    | NASA, Published in 2012, 128 pages
31. Atomic and Molecular Processes in Astronomy and Planetary Science
    Geoffrey A. Blake | California Institute of Technology, Published in 2004
32. Cosmology for Particle Physicists
    U. A. Yajnik | arXiv, Published in 2008, 63 pages
33. Habitable Planets for Man
    Stephen H. Dole | RAND Corporation, Published in 1964, 176 pages
34. Gamma-Ray Bursts
    | Wikipedia, Published in 2014
35. Elements of Astrophysics
    Nick Kaiser | University of Hawaii, Published in 2002, 435 pages
36. Magnetic Fields, Strings and Cosmology
    Massimo Giovannini | arXiv, Published in 2006, 76 pages
37. To See the Unseen: A History of Planetary Radar Astronomy
    Andrew J. Butrica | NASA History Division, Published in 1996, 301 pages
38. Big Bang Nucleosynthesis and Physics Beyond the Standard Model
    Subir Sarkar | arXiv, Published in 1996, 156 pages
39. Observations of the High Redshift Universe
    Richard S. Ellis | arXiv, Published in 2007, 115 pages
40. Cosmic Rays in Galactic and Extragalactic Magnetic Fields
    F. Aharonian, A. Bykov, E. Parizot, V. Ptuskin, A. Watson | arXiv, Published in 2011, 43 pages
41. Protoplanetary Disks and Their Evolution
    Jonathan P. Williams, Lucas A. Cieza | arXiv, Published in 2011, 65 pages
42. Mathematical Theories of Planetary Motions
    Otto Dziobek | The Register Pub. Co., Published in 1892, 314 pages
43. An Introduction to Quantum Cosmology
    D.L. Wiltshire | arXiv, Published in 2003, 60 pages
44. Introduction to Early Universe Cosmology
    Robert H. Brandenberger | arXiv, Published in 2011, 70 pages
45. Planetary Science: A Lunar Perspective
    Stuart Ross Taylor | Lunar and Planetary Institute, Published in 1982
46. Caldwell Catalogue
    | Wikipedia, Published in 2014
47. Lecture notes on the formation and early evolution of planetary systems
    Philip J. Armitage | arXiv, Published in 2010, 63 pages
48. The Star Splitters: The High Energy Astronomy Observatories
    Wallace H. Tucker | NASA History Office, Published in 1984, 182 pages
49. Cosmic Structure, Averaging and Dark Energy
    David L. Wiltshire | arXiv, Published in 2013, 55 pages
50. A Simple Guide to Backyard Astronomy
    Carol Beigel | , Published in 2008, 61 pages
51. Dynamics of the Universe in Problems
    Yu. L. Bolotin, et al. | UniverseInProblems.com, Published in 2013, 113 pages
52. The Fine-Tuning of the Universe for Intelligent Life
    Luke A. Barnes | arXiv, Published in 2011, 76 pages
53. Gravitational Wave Experiments and Early Universe Cosmology
    Michele Maggiore | arXiv, Published in 2000, 100 pages
54. Protostars and Planets
    | Rice University, Published in 2015, 422 pages
55. Introduction to Physical Astronomy
    Kenneth R. Koehler | University of Cincinnati, Published in 2010
56. Voyager 1 and 2: Atlas of Six Saturnian Satellites
    Raymond M. Batson | NASA, Published in 1984, 175 pages
57. The Galactic Habitable Zone I. Galactic Chemical Evolution
    G. Gonzalez, D. Brownlee, P. Ward | arXiv, Published in 2001, 57 pages
58. The Practical Astronomer
    Thomas Dick | Seeley, Burnside, and Seeley, Published in 1845, 588 pages
59. Cosmological Evolution of Galaxies
    Isaac Shlosman | arXiv, Published in 2012, 88 pages
60. The Complete Idiot's Guide to The Sun
    Jay M. Pasachoff | Alpha, Published in 2003, 350 pages
61. Through the Telescope
    James Baikie | Adam and Charles Black, Published in 1906, 303 pages
62. The Geology of the Terrestrial Planets
    Michael H. Carr | NASA, Published in 1984, 322 pages
63. The Shape of the Universe
    Gerd Pommerenke | viXra, Published in 2013, 321 pages
64. Elementary Astronomy
    James N. Pierce | , Published in 2013, 134 pages
65. Views of the Solar System
    Calvin J. Hamilton | , Published in 2008
66. Guidebook to the Geology of Barringer Meteorite Crater, Arizona
    David A. Kring | Lunar and Planetary Institute, Published in 2007, 154 pages
67. Radiative Gas Dynamics
    David Weinberg | Ohio State University, Published in 2007
68. Cosmology and Astrophysics
    Juan Garcia-Bellido | arXiv.org, Published in 2005, 76 pages
69. Inflation and String Theory
    Daniel Baumann, Liam McAllister | arXiv, Published in 2014, 349 pages
70. Dark Energy: Observational Evidence and Theoretical Models
    B. Novosyadlyj, V. Pelykh, Yu. Shtanov, A. Zhuk | Akademperiodyka, Published in 2013, 380 pages
71. Cosmology: Mankind's Grand Investigation
    Greg Bothun | Harcourt Brace College Publishers, Published in 1999, 129 pages
72. The Birth and Death of Stars
    James Schombert | University of Oregon, Published in 2008
73. The Foundations of Celestial Mechanics
    George W. Collins, II | Pachart Pub House, Published in 2004, 145 pages
74. Introduction to Cosmology
    David H Lyth | arXiv, Published in 1993, 53 pages
75. Photographs of Nebulae and Clusters
    James Edward Keeler | University of California Publications, Published in 1908
76. Cosmology Primer
    Sean Carroll | preposterousuniverse.com, Published in 2012, 120 pages
77. Planetary Photometry
    Max Fairbairn | , Published in 2005
78. Stellar Atmospheres
    J. B. Tatum | , Published in 2006
79. The Fundamentals of Stellar Astrophysics
    George W. Collins, II | W H Freeman & Co, Published in 2003, 494 pages
80. Man's Place in the Universe
    Alfred R. Wallace | Chapman and Hall, Published in 1904, 330 pages
81. Lectures on Astronomy, Astrophysics, and Cosmology
    Luis A. Anchordoqui | arXiv, Published in 2007, 41 pages
82. High Energy Astrophysics
    Jonathan Katz | The Benjamin/Cummings Publishing, Published in 1986, 338 pages
83. Observing the Sky from 40N
    Roberto Mura | Wikibooks, Published in 2010, 86 pages
84. Everything You Always Wanted To Know About The Cosmological Constant Problem
    Jerome Martin | arXiv, Published in 2012, 89 pages
85. General Astronomy
    Harold Spencer Jones | Edward Arnold and Company, Published in 1924, 392 pages
86. Handbook of Space Astronomy and Astrophysics
    Martin V. Zombeck | Cambridge University Press, Published in 2006, 780 pages
87. Spherical Astronomy
    F. Brünnow | Van Nostrand, Published in 1865, 559 pages
88. The Cosmological Constant
    Sean M. Carroll | arXiv, Published in 2000, 50 pages
89. Cosmology: The Study of the Universe
    | NASA, Published in 2009, 38 pages
90. The Telescope
    Louis Bell | McGraw-Hill, Published in 1922, 294 pages
91. The Beginning and the End: The Meaning of Life in a Cosmological Perspective
    Clement Vidal | arXiv, Published in 2013, 356 pages
92. Mars Science Laboratory
    | Wikipedia, Published in 2014
93. Observational Probes of Cosmic Acceleration
    David H. Weinberg, et al. | arXiv, Published in 2012, 253 pages
94. Inflation
    Marieke Postma | NIKHEF, Published in 2009, 53 pages
95. Practical Astronomy
    P. S. Michie, F. S. Harlow | John Wiley & Sons, Published in 1893, 246 pages
96. General Astronomy
    | Wikibooks, Published in 2009
97. Traces of Catastrophe
    Bevan M French | Lunar and Planetary Institute, Published in 1998, 120 pages
98. Introduction to Millimeter/Sub-Millimeter Astronomy
    T. L. Wilson | arXiv, Published in 2009, 106 pages
99. The Beginning and Evolution of the Universe
    Bharat Ratra, Michael S. Vogeley | arXiv, Published in 2008, 69 pages
100. Short History of Astronomy
     Arthur Berry | John Murray, Published in 1898, 439 pages
101. A Handbook of Descriptive and Practical Astronomy
     George F. Chambers | Oxford At The Clarendon Press, Published in 1889, 756 pages
102. The Astronomy of the Bible
     E. Walter Maunder | Richard Clay & Sons, Published in 1908
103. An Introduction to Astronomy
     Forest Ray Moulton | The MacMillan Company, Published in 1916, 577 pages
104. Images of the Solar Upper Atmosphere From SUMER on SOHO
     Uri Feldman, at al. | ESA Publications Division, Published in 2003, 209 pages
105. A New Astronomy
     David Peck Todd | American Book Company, Published in 1906, 437 pages
106. Vision and Voyages for Planetary Science in the Decade 2013-2022
     | National Academy of Sciences, Published in 2011, 410 pages
107. A Review of the Universe: Structures, Evolutions, Observations, and Theories
     | universe-review.ca, Published in 2009
108. Voyager Encounters Jupiter
     | National Aeronautics and Space Administration, Published in 1979, 48 pages
109. The History of Astrometry
     Michael Perryman | arXiv, Published in 2012, 52 pages
110. Mechanism of the Heavens
     Mary Somerville | J. Murray, Published in 1831, 710 pages
111. Cosmic Microwave Background Anisotropies up to Second Order
     Nicola Bartolo, Sabino Matarrese, Antonio Riotto | arXiv, Published in 2007, 53 pages
112. 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
113. Cosmic Journey: A History of Scientific Cosmology
     N. S. Hetherington, W. P. McCray | American Institute of Physics, Published in 2009
114. Mag 7 Star Atlas Project
     Andrew L. Johnson | , Published in 2007, 21 pages
115. The Search for Extraterrestrial Intelligence, SETI
     Philip Morrison, John Billingham, John Wolfe | NASA, Published in 1979, 293 pages
116. An Introduction to Celestial Mechanics
     Forest Ray Moulton | The MacMillan Company, Published in 1914, 437 pages
117. The Birth And Death Of The Sun
     George Gamow | Dover Publications, Published in 1940, 256 pages
118. A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
     Licia Verde | arXiv, Published in 2008, 52 pages
119. Astronomical Image and Data Analysis
     J.-L. Starck, F. Murtagh | Springer, Published in 2006, 335 pages
120. String Cosmology
     James M. Cline | arXiv, Published in 2007, 47 pages
121. The Virial Theorem in Stellar Astrophysics
     George W. Collins, II | Pachart Pub. House, Published in 1978, 135 pages
122. Gravitational Waves: Sources, Detectors and Searches
     Keith Riles | arXiv, Published in 2012, 79 pages
123. A Briefer History of Time: From the Big Bang to the Big Mac
     Eric Schulman | St. Martin's Press, Published in 2004, 207 pages
124. Pioneer Saturn Encounter
     | NASA, Published in 1979, 45 pages
125. First Light
     Abraham Loeb | arXiv, Published in 2006, 157 pages
126. Galaxies and the Expanding Universe
     James Schombert | University of Oregon, Published in 2008
127. The Astrobiology Primer: An Outline of General Knowledge
     Lucas J. Mix, at al. | arXiv, Published in 2006, 79 pages
128. Exoplanet Observing for Amateurs
     Bruce L. Gary | Reductionist Publications, Published in 2007, 170 pages
129. Dwarf-Galaxy Cosmology
     Regina Schulte-Ladbeck, at al. | Hindawi Publishing, Published in 2010, 238 pages
130. The Cosmic Web: Geometric Analysis
     Rien van de Weygaert, Willem Schaap | arXiv, Published in 2007, 129 pages
131. A Guide To The Constellations
     Samuel G. Barton | McGraw-Hill, Published in 1928, 96 pages
132. Techniques of Radio Astronomy
     T. L. Wilson | arXiv, Published in 2011, 47 pages
133. Solar Neutrinos
     V. Antonelli, L. Miramonti, C. Pena-Garay, A. Serenelli | arXiv, Published in 2012, 51 pages
134. The Story of Eclipses
     George F. Chambers | S. S. McClure Co., Published in 1909, 208 pages
135. The Hubble Constant
     Neal Jackson | arXiv, Published in 2014, 48 pages
136. Star-Gazer's Hand-Book
     Henry William Elson | Sturgis & Walton, Published in 1910, 72 pages
137. An introductory treatise on the lunar theory
     Ernest W Brown | Cambridge University Press, Published in 1896, 312 pages
138. Astronomy Notes
     Nick Strobel | astronomynotes.com, Published in 2010
139. Introduction to the Theory of Black Holes
     Gerard 't Hooft | Utrecht University, Published in 2009, 49 pages
140. Introduction to relativistic astrophysics and cosmology through Maple
     V. L. Kalashnikov | arXiv, Published in 2001, 124 pages
141. High Performance Computing and Numerical Modelling
     Volker Springel | arXiv, Published in 2014, 108 pages
142. Lopsided Spiral Galaxies
     Chanda J. Jog, Francoise Combes | arXiv, Published in 2008, 75 pages
143. The Formation and Evolution of the Solar System
     James Schombert | University of Oregon, Published in 2007
144. Supernova Cosmology: Legacy and Future
     Ariel Goobar, Bruno Leibundgut | arXiv, Published in 2011, 62 pages
145. Advances in Modern Cosmology
     Adnan Ghribi | InTech, Published in 2011, 198 pages
146. Modified Gravity and Cosmology
     T. Clifton, P.G. Ferreira, A. Padilla, C. Skordis | arXiv, Published in 2012, 312 pages
147. Astrodynamics: A Compendium of Orbitology
     | Wikipedia, Published in 2013, 334 pages
148. Ekpyrotic and Cyclic Cosmology
     Jean-Luc Lehners | arXiv, Published in 2009, 79 pages
149. Neutrinos and the Stars
     Georg Raffelt | arXiv, Published in 2012, 83 pages
150. Oulu Space Physics Textbook
     Reijo Rasinkangas | University of Oulu, Published in 2008
151. Supernovae
     | Wikipedia, Published in 2014
152. On the Origin (and Evolution) of Baryonic Galaxy Halos
     Duncan A. Forbes, Ericson D. Lopez | MDPI AG, Published in 2018, 232 pages
153. Astronomical Discovery
     Herbert Hall Turner | E. Arnold, Published in 1904, 225 pages
154. Voyager 1 Encounters Saturn
     | NASA, Published in 1980, 51 pages
155. Astrochemistry: The Issue of Molecular Complexity in Astrophysical Environments
     M. De Becker | arXiv, Published in 2013, 62 pages
156. Cosmology
     V. A. Rubakov | arXiv.org, Published in 2018, 56 pages
157. When Biospheres Collide: A History of NASA's Planetary Protection Programs
     Michael Meltzer | NASA, Published in 2011, 542 pages
158. Celestial Mechanics
     J. B. Tatum | , Published in 2008
159. Celestial Mechanics: Notes and Work
     J.D. Mireles James | Rutgers University, Published in 2007, 128 pages
160. Astronomy
     Andrew Fraknoi, David Morrison, Sidney C. Wolff | Unglue.it, Published in 2016, 1200 pages
161. From Cosmic Birth to Living Earths: The Future of UVOIR Space Astronomy
     Julianne Dalcanton, et al. | arXiv, Published in 2015, 176 pages
162. Particle Physics Aspects of Modern Cosmology
     Robert H. Brandenberger | arXiv, Published in 1997, 70 pages
163. Cluster Lenses
     Jean-Paul Kneib, Priyamvada Natarajan | arXiv, Published in 2012, 120 pages
164. Planetary Theory
     Ernest Brown, Clarence Shook | Cambridge University Press, Published in 1933, 323 pages
165. Black Holes
     P.K. Townsend | arXiv, Published in 1997, 145 pages
166. An Expanded View of the Universe
     | European Southern Observatory, Published in 2011, 54 pages
167. Dense Matter in Compact Stars
     Andreas Schmitt | arXiv, Published in 2010, 146 pages
168. Introductory Lectures on Quantum Cosmology
     J. J. Halliwell | arXiv, Published in 1990, 107 pages
169. Lectures on Inflation and Cosmological Perturbations
     David Langlois | arXiv, Published in 2010, 56 pages
170. Introduction to Cosmology
     A. D. Dolgov | arXiv, Published in 2009, 58 pages
171. Great Astronomers
     Robert S. Ball | Isbister, Published in 1895, 392 pages
172. Stellar Superfluids
     Dany Page, et al. | arXiv, Published in 2013, 88 pages
173. Lectures on Black Holes, Topological Strings and Quantum Attractors
     Boris Pioline | arXiv, Published in 2007, 103 pages
174. Atlas of Peculiar Galaxies
     Halton C. Arp | California Institute of Technology, Published in 1966, 190 pages
175. Cosmos and Culture: Cultural Evolution in a Cosmic Context
     Steven J. Dick, Mark L. Lupisella | NASA, Published in 2010, 612 pages
176. Galaxy systems in the optical and infrared
     A. Biviano | arXiv, Published in 2008, 60 pages
177. From Chaos to Consciousness: A Brief History of the Universe
     Mike Corwin | Bookboon, Published in 2015, 166 pages
178. Basaltic Volcanism on the Terrestrial Planets
     | Pergamon Press, Published in 1981, 1286 pages
179. The world according to the Hubble Space Telescope
     Mario Livio | arXiv.org, Published in 2008, 112 pages
180. Archaeology, Anthropology, and Interstellar Communication
     Douglas A. Vakoch | NASA, Published in 2014, 330 pages
181. Plasma Physics of Extreme Astrophysical Environments
     Dmitri A. Uzdensky, Shane Rightley | arXiv, Published in 2014, 56 pages
182. Introduction to Dark Matter Experiments
     R. W. Schnee | arXiv.org, Published in 2011, 64 pages
183. A Primer for Black Hole Quantum Physics
     R. Brout, S. Massar, R. Parentani, P. Spindel | arXiv, Published in 2007, 178 pages
184. The First Stars
     Simon C. O. Glover | arXiv, Published in 2012, 72 pages
185. Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope
     Dylan Steele (ed.) | NASA, Published in 2015, 78 pages
186. A Text-book of Astronomy
     George C. Comstock | D. Appleton and company, Published in 1901, 391 pages
187. An Overview of the Solar System
     | Wikipedia, Published in 2013
188. Mysteries of the Sun
     Ginger Butcher | NASA, Published in 2011, 20 pages
189. Sky Surveys
     S. G. Djorgovski, A.A. Mahabal, A.J. Drake, M.J. Graham, C. Donalek | arXiv, Published in 2012, 62 pages
190. Supernova Remnants: The X-ray Perspective
     Jacco Vink | arXiv, Published in 2011, 78 pages
191. Cosmic Rays and the Search for a Lorentz Invariance Violation
     Wolfgang Bietenholz | arXiv, Published in 2008, 81 pages
192. Superstring Cosmology
     James E. Lidsey, David Wands, E. J. Copeland | arXiv, Published in 2000, 161 pages
193. A Practical Introduction to Numerical Hydrodynamics
     Garrelt Mellema | Leiden University, Published in 2003, 124 pages
194. Elementary Mathematical Astronomy
     C. Barlow, G. Bryan | University Correspondence College Press, Published in 1893, 442 pages
195. Lunar Orbiter Photographic Atlas of the Moon
     D.E. Hughes, J.K. Bowker | Lunar and Planetary Institute, Published in 1971
196. Chemistry in Protoplanetary Disks
     Thomas Henning, Dmitry Semenov | arXiv, Published in 2013, 84 pages
197. Particle Physics and Inflationary Cosmology
     Andrei Linde | arXiv, Published in 2005, 270 pages
198. Frequently Asked Questions about Calendars
     Claus Tøndering | , Published in 2008, 65 pages
199. Astronomy for Amateurs
     Camille Flammarion | D. Appleton and Company, Published in 1910
200. The Universe in a Helium Droplet
     Grigory E. Volovik | Oxford University Press, Published in 2003, 532 pages
201. Black-Hole Phenomenology
     Neven Bilic | arXiv, Published in 2006, 58 pages
202. Recreations in Astronomy
     Henry White Warren | Project Gutenberg,
203. Practical Astronomy
     George L. Hosmer | John Wiley and Sons Inc., Published in 1925, 314 pages
204. Telescopic Work for Starlight Evenings
     William F. Denning | Taylor and Francis, Published in 1891, 372 pages
205. Voyage to Jupiter
     David Morrison, Jane Samz | NASA, Published in 1980, 218 pages
206. Ultrahigh Energy Cosmic Rays: Facts, Myths, and Legends
     Luis Alfredo Anchordoqui | arXiv, Published in 2011, 92 pages
207. From Disks to Planets
     Andrew N. Youdin, Scott J. Kenyon | arXiv, Published in 2012, 70 pages
208. Radiative Processes in High Energy Astrophysics
     Gabriele Ghisellini | arXiv, Published in 2012, 157 pages
209. Astronomy of To-day
     Cecil Goodrich Julius Dolmage | Seeley and co., Published in 1910
210. Encyclopedia of Astrophysics
     Søren Bertil F. Dorch | Scholarpedia, Published in 2009
211. Curiosities of the Sky
     Garrett Putman Serviss | Harper & Brothers, Published in 1909, 300 pages
212. Special Functions: Fractional Calculus and the Pathway for Entropy
     Hans J. Haubold (ed.) | MDPI AG, Published in 2018, 306 pages
213. Large Scale Structure of the Universe
     Alison L. Coil | arXiv, Published in 2012, 43 pages
214. A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
     Mary Bourke, Heather Viles | Planetary Science Institute, Published in 2007, 88 pages
215. Amateur Telescope Making
     | Springfield Telescope Makers Inc, Published in 2018, 428 pages
216. Hours With A Three-Inch Telescope
     William Noble | Longmans, Green & Co., Published in 1887, 159 pages
217. An Introduction to the Theory of Rotating Relativistic Stars
     Eric Gourgoulhon | arXiv, Published in 2010, 88 pages
218. Observatories in Space
     Catherine Turon | arXiv, Published in 2011, 50 pages
219. Applied Cosmography: A Pedagogical Review
     Yu. L. Bolotin, et al. | arXiv.org, Published in 2018, 66 pages
220. An Exposition on Inflationary Cosmology
     Scott Watson | arXiv, Published in 2000, 93 pages
221. Massive Stars and their Supernovae
     F. Thielemann, R. Hirschi, M. Liebendorfer, R. Diehl | arXiv, Published in 2010, 81 pages
222. Notes on Stellar Astrophysics
     James N. Pierce | Minnesota State University, Published in 2013, 299 pages
223. Celestial Navigation, Elementary Astronomy, Piloting
     Arturo Chiesa, Raffaele Chiesa | Sky and Sea Software, Published in 2010
224. To a Rocky Moon: A Geologist's History of Lunar Exploration
     Don E. Wilhelms | University of Arizona Press, Published in 1993, 524 pages
225. History of Astronomy
     George Forbes | , Published in 1909
226. Quantization in Astrophysics, Brownian Motion, and Supersymmetry
     F. Smarandache, V. Christianto | MathTiger, Published in 2007, 516 pages
227. Astronomy with an Opera-glass
     Garrett Putman Serviss | D. Appleton & co., Published in 1890, 154 pages
228. An Introduction to Cosmic Rays and Gamma-Ray Bursts
     A. De Rujula | arXiv, Published in 2007, 37 pages
229. An Introduction to Celestial Mechanics
     Richard Fitzpatrick | The University of Texas at Austin, Published in 2011, 216 pages
230. Moon Trip: A Personal Account of the Apollo Program and its Science
     Elbert A. King | Lunar and Planetary Institute, Published in 1989, 162 pages
231. Searching for Life Across Space and Time
     | The National Academies Press, Published in 2017, 133 pages
232. Chondrules and their Origins
     Elbert A. King | The Lunar and Planetary Institute, Published in 1983, 377 pages
233. The Solar Magnetic Field
     Sami Solanki, Bernd Inhester, Manfred Schussler | arXiv, Published in 2010, 83 pages
234. TASI Lectures: Introduction to Cosmology
     Mark Trodden, Sean M. Carroll | arXiv, Published in 2004, 82 pages
235. Why CMB physics?
     Massimo Giovannini | arXiv, Published in 2007, 179 pages
236. Pioneers of Science
     Oliver Lodge | Macmillan and co, Published in 1905, 421 pages
237. Solar System
     | Wikipedia, Published in 2012, 646 pages
238. Primordial Magnetogenesis
     Alejandra Kandus, Kerstin E. Kunze, Christos G. Tsagas | arXiv, Published in 2011, 107 pages
239. Introduction to Supersymmetry: Astrophysical and Phenomenological Constraints
     Keith A. Olive | arXiv, Published in 1999, 67 pages