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. A Briefer History of Time: From the Big Bang to the Big Mac
   Eric Schulman | St. Martin's Press, Published in 2004, 207 pages
2. Evolution of the Solar System
   Hannes Alfven, Gustaf Arrhenius | NASA, Published in 1976
3. Notes on Stellar Astrophysics
   James N. Pierce | Minnesota State University, Published in 2013, 299 pages
4. From Disks to Planets
   Andrew N. Youdin, Scott J. Kenyon | arXiv, Published in 2012, 70 pages
5. Man's Place in the Universe
   Alfred R. Wallace | Chapman and Hall, Published in 1904, 330 pages
6. Archaeology, Anthropology, and Interstellar Communication
   Douglas A. Vakoch | NASA, Published in 2014, 330 pages
7. Cosmological Evolution of Galaxies
   Isaac Shlosman | arXiv, Published in 2012, 88 pages
8. Inflationary Cosmology and Structure Formation
   J. A. Peacock | arXiv, Published in 1996, 77 pages
9. The Practical Astronomer
   Thomas Dick | Seeley, Burnside, and Seeley, Published in 1845, 588 pages
10. A Practical Introduction to Numerical Hydrodynamics
    Garrelt Mellema | Leiden University, Published in 2003
11. Observations of the High Redshift Universe
    Richard S. Ellis | arXiv, Published in 2007, 115 pages
12. Practical Astronomy
    George L. Hosmer | John Wiley and Sons Inc., Published in 1925, 314 pages
13. Introduction to Physical Astronomy
    Kenneth R. Koehler | University of Cincinnati, Published in 2010
14. High Performance Computing and Numerical Modelling
    Volker Springel | arXiv, Published in 2014, 108 pages
15. Consolidated Lunar Atlas
    Gerald P. Kuiper, et al. | Lunar and Planetary Institute, Published in 1960
16. Protostars and Planets
    | Rice University, Published in 2015, 422 pages
17. Mercury
    F. Vilas, C. Chapman, M. Matthews | University of Arizona Press, Published in 1989, 794 pages
18. Observing the Sky from 30S
    Roberto Mura | Wikibooks, Published in 2010, 86 pages
19. Textbook on Practical Astronomy
    George Leonard Hosmer | Wiley, Published in 1910, 252 pages
20. The Astrobiology Primer: An Outline of General Knowledge
    Lucas J. Mix, at al. | arXiv, Published in 2006, 79 pages
21. Cosmic Structure, Averaging and Dark Energy
    David L. Wiltshire | arXiv, Published in 2013, 55 pages
22. Voyage to Jupiter
    David Morrison, Jane Samz | NASA, Published in 1980, 218 pages
23. Gravitational Wave Experiments and Early Universe Cosmology
    Michele Maggiore | arXiv, Published in 2000, 100 pages
24. Images of the Solar Upper Atmosphere From SUMER on SOHO
    Uri Feldman, at al. | ESA Publications Division, Published in 2003, 209 pages
25. The Universe in a Helium Droplet
    Grigory E. Volovik | Oxford University Press, Published in 2003, 532 pages
26. An Introduction to Astronomy
    Forest Ray Moulton | The MacMillan Company, Published in 1916, 577 pages
27. Advances in Modern Cosmology
    Adnan Ghribi | InTech, Published in 2011, 198 pages
28. Solar Neutrinos
    V. Antonelli, L. Miramonti, C. Pena-Garay, A. Serenelli | arXiv, Published in 2012, 51 pages
29. Astronomy Notes
    Nick Strobel | astronomynotes.com, Published in 2010
30. An Expanded View of the Universe
    | European Southern Observatory, Published in 2011, 54 pages
31. The Star Splitters: The High Energy Astronomy Observatories
    Wallace H. Tucker | NASA History Office, Published in 1984, 182 pages
32. An introductory treatise on the lunar theory
    Ernest W Brown | Cambridge University Press, Published in 1896, 312 pages
33. Gravitational Wave Detection by Interferometry
    Matthew Pitkin, Stuart Reid, Sheila Rowan, Jim Hough | arXiv, Published in 2011, 80 pages
34. An Introduction to the Theory of Rotating Relativistic Stars
    Eric Gourgoulhon | arXiv, Published in 2010, 88 pages
35. Supernovae
    | Wikipedia, Published in 2014
36. Primordial Magnetogenesis
    Alejandra Kandus, Kerstin E. Kunze, Christos G. Tsagas | arXiv, Published in 2011, 107 pages
37. From Cosmic Birth to Living Earths: The Future of UVOIR Space Astronomy
    Julianne Dalcanton, et al. | arXiv, Published in 2015, 176 pages
38. Modified Gravity and Cosmology
    T. Clifton, P.G. Ferreira, A. Padilla, C. Skordis | arXiv, Published in 2012, 312 pages
39. The Shape of the Universe
    Gerd Pommerenke | viXra, Published in 2013, 321 pages
40. The First Stars
    Simon C. O. Glover | arXiv, Published in 2012, 72 pages
41. The History of Astrometry
    Michael Perryman | arXiv, Published in 2012, 52 pages
42. The Telescope
    Louis Bell | McGraw-Hill, Published in 1922, 294 pages
43. An Introduction to Galactic Chemical Evolution
    Nikos Prantzos | arXiv, Published in 2007, 46 pages
44. Telescopic Work for Starlight Evenings
    William F. Denning | Taylor and Francis, Published in 1891, 372 pages
45. Atlas of Peculiar Galaxies
    Halton C. Arp | California Institute of Technology, Published in 1966, 190 pages
46. Views of the Solar System
    Calvin J. Hamilton | , Published in 2008
47. Superstring Cosmology
    James E. Lidsey, David Wands, E. J. Copeland | arXiv, Published in 2000, 161 pages
48. The Birth and Death of Stars
    James Schombert | University of Oregon, Published in 2008
49. General Astronomy
    Harold Spencer Jones | Edward Arnold and Company, Published in 1924, 392 pages
50. Dark Energy: Observational Evidence and Theoretical Models
    B. Novosyadlyj, V. Pelykh, Yu. Shtanov, A. Zhuk | Akademperiodyka, Published in 2013, 380 pages
51. Astrochemistry: The Issue of Molecular Complexity in Astrophysical Environments
    M. De Becker | arXiv, Published in 2013, 62 pages
52. Cluster Lenses
    Jean-Paul Kneib, Priyamvada Natarajan | arXiv, Published in 2012, 120 pages
53. Mechanism of the Heavens
    Mary Somerville | J. Murray, Published in 1831, 710 pages
54. Ekpyrotic and Cyclic Cosmology
    Jean-Luc Lehners | arXiv, Published in 2009, 79 pages
55. Advances in Global and Local Helioseismology: an Introductory Review
    Alexander G. Kosovichev | arXiv, Published in 2011, 86 pages
56. Applied Cosmography: A Pedagogical Review
    Yu. L. Bolotin, et al. | arXiv.org, Published in 2018, 66 pages
57. Photographs of Nebulae and Clusters
    James Edward Keeler | University of California Publications, Published in 1908
58. An Introduction to Celestial Mechanics
    Forest Ray Moulton | The MacMillan Company, Published in 1914, 437 pages
59. Pioneer Saturn Encounter
    | NASA, Published in 1979, 45 pages
60. Plasma Physics of Extreme Astrophysical Environments
    Dmitri A. Uzdensky, Shane Rightley | arXiv, Published in 2014, 56 pages
61. The Beginning and Evolution of the Universe
    Bharat Ratra, Michael S. Vogeley | arXiv, Published in 2008, 69 pages
62. Short History of Astronomy
    Arthur Berry | John Murray, Published in 1898, 439 pages
63. Moon Trip: A Personal Account of the Apollo Program and its Science
    Elbert A. King | Lunar and Planetary Institute, Published in 1989, 162 pages
64. High Energy Astrophysics
    Jonathan Katz | The Benjamin/Cummings Publishing, Published in 1986, 338 pages
65. Caldwell Catalogue
    | Wikipedia, Published in 2014
66. Through the Telescope
    James Baikie | Adam and Charles Black, Published in 1906, 303 pages
67. Techniques of Radio Astronomy
    T. L. Wilson | arXiv, Published in 2011, 47 pages
68. An Introduction into the Theory of Cosmological Structure Formation
    Christian Knobel | arXiv, Published in 2012, 102 pages
69. The Fine-Tuning of the Universe for Intelligent Life
    Luke A. Barnes | arXiv, Published in 2011, 76 pages
70. Dwarf-Galaxy Cosmology
    Regina Schulte-Ladbeck, at al. | Hindawi Publishing, Published in 2010, 238 pages
71. Are We Alone?
    Gregg Easterbrook | The Atlantic Monthly, Published in 1988
72. Dynamics of the Universe in Problems
    Yu. L. Bolotin, et al. | UniverseInProblems.com, Published in 2013, 113 pages
73. Astronomy
    Andrew Fraknoi, David Morrison, Sidney C. Wolff | Unglue.it, Published in 2016, 1200 pages
74. An Introduction to Quantum Cosmology
    D.L. Wiltshire | arXiv, Published in 2003, 60 pages
75. Mathematical Theories of Planetary Motions
    Otto Dziobek | The Register Pub. Co., Published in 1892, 314 pages
76. The Birth And Death Of The Sun
    George Gamow | Dover Publications, Published in 1940, 256 pages
77. Particle Physics Aspects of Modern Cosmology
    Robert H. Brandenberger | arXiv, Published in 1997, 70 pages
78. Cosmology: Mankind's Grand Investigation
    Greg Bothun | Harcourt Brace College Publishers, Published in 1999, 129 pages
79. Observing the Sky from 40N
    Roberto Mura | Wikibooks, Published in 2010, 86 pages
80. The Story of Eclipses
    George F. Chambers | S. S. McClure Co., Published in 1909, 208 pages
81. Amateur Telescope Making
    | Springfield Telescope Makers Inc, Published in 2018, 428 pages
82. First Light
    Abraham Loeb | arXiv, Published in 2006, 157 pages
83. Cosmic Rays in Galactic and Extragalactic Magnetic Fields
    F. Aharonian, A. Bykov, E. Parizot, V. Ptuskin, A. Watson | arXiv, Published in 2011, 43 pages
84. Astronomy with an Opera-glass
    Garrett Putman Serviss | D. Appleton & co., Published in 1890, 154 pages
85. Celestial Mechanics
    J. B. Tatum | , Published in 2008
86. Lecture notes on the formation and early evolution of planetary systems
    Philip J. Armitage | arXiv, Published in 2010, 63 pages
87. Mathematical Problems Of Radiative Equilibrium
    Eberhard Hopf | Cambridge University Press, Published in 1934, 123 pages
88. 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
89. Encyclopedia of Astrophysics
    Søren Bertil F. Dorch | Scholarpedia, Published in 2009
90. Lectures on Astronomy, Astrophysics, and Cosmology
    Luis A. Anchordoqui | arXiv, Published in 2007, 41 pages
91. Advanced Topics in Cosmology: A Pedagogical Introduction
    T. Padmanabhan | arXiv, Published in 2006, 40 pages
92. Massive Stars and their Supernovae
    F. Thielemann, R. Hirschi, M. Liebendorfer, R. Diehl | arXiv, Published in 2010, 81 pages
93. Cosmic Microwave Background Anisotropies up to Second Order
    Nicola Bartolo, Sabino Matarrese, Antonio Riotto | arXiv, Published in 2007, 53 pages
94. Star-Gazer's Hand-Book
    Henry William Elson | Sturgis & Walton, Published in 1910, 72 pages
95. Chondrules and their Origins
    Elbert A. King | The Lunar and Planetary Institute, Published in 1983, 377 pages
96. Cosmology and Astrophysics
    Juan Garcia-Bellido | arXiv.org, Published in 2005, 76 pages
97. Oulu Space Physics Textbook
    Reijo Rasinkangas | University of Oulu, Published in 2008
98. Elements of Astrophysics
    Nick Kaiser | University of Hawaii, Published in 2002, 435 pages
99. Searching for Life Across Space and Time
    | The National Academies Press, Published in 2017, 133 pages
100. A Guide To The Constellations
     Samuel G. Barton | McGraw-Hill, Published in 1928, 96 pages
101. Elementary Mathematical Astronomy
     C. Barlow, G. Bryan | University Correspondence College Press, Published in 1893, 442 pages
102. The Virial Theorem in Stellar Astrophysics
     George W. Collins, II | Pachart Pub. House, Published in 1978, 135 pages
103. Gamma-Ray Bursts
     | Wikipedia, Published in 2014
104. Introductory Lectures on Quantum Cosmology
     J. J. Halliwell | arXiv, Published in 1990, 107 pages
105. Sky Surveys
     S. G. Djorgovski, A.A. Mahabal, A.J. Drake, M.J. Graham, C. Donalek | arXiv, Published in 2012, 62 pages
106. History of Astronomy
     George Forbes | , Published in 1909
107. Stellar Superfluids
     Dany Page, et al. | arXiv, Published in 2013, 88 pages
108. Basaltic Volcanism on the Terrestrial Planets
     | Pergamon Press, Published in 1981, 1286 pages
109. The Astronomy of the Bible
     E. Walter Maunder | Richard Clay & Sons, Published in 1908
110. Introduction to Cosmology
     David H Lyth | arXiv, Published in 1993, 53 pages
111. A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
     Licia Verde | arXiv, Published in 2008, 52 pages
112. Origin of the Moon
     W. K. Hartmann, R. J. Phillips, G. J. Taylor | Lunar and Planetary Institute, Published in 1986, 781 pages
113. The world according to the Hubble Space Telescope
     Mario Livio | arXiv.org, Published in 2008, 112 pages
114. A Primer for Black Hole Quantum Physics
     R. Brout, S. Massar, R. Parentani, P. Spindel | arXiv, Published in 2007, 178 pages
115. Gravitational Waves: Sources, Detectors and Searches
     Keith Riles | arXiv, Published in 2012, 79 pages
116. Celestial Mechanics: Notes and Work
     J.D. Mireles James | Rutgers University, Published in 2007, 128 pages
117. Guide to Lunar Orbiter Photographs
     Thomas P. Hansen | NASA, Published in 1970, 127 pages
118. Spherical Astronomy
     F. Brünnow | Van Nostrand, Published in 1865, 559 pages
119. Voyager 1 Encounters Saturn
     | NASA, Published in 1980, 51 pages
120. Vision and Voyages for Planetary Science in the Decade 2013-2022
     | National Academy of Sciences, Published in 2011, 410 pages
121. An Exposition on Inflationary Cosmology
     Scott Watson | arXiv, Published in 2000, 93 pages
122. Why CMB physics?
     Massimo Giovannini | arXiv, Published in 2007, 179 pages
123. Supernova Cosmology: Legacy and Future
     Ariel Goobar, Bruno Leibundgut | arXiv, Published in 2011, 62 pages
124. Planetary Photometry
     Max Fairbairn | , Published in 2005
125. Planetary Rings
     Matthew S. Tiscareno | arXiv, Published in 2011, 82 pages
126. A New Astronomy
     David Peck Todd | American Book Company, Published in 1906, 437 pages
127. A Text-book of Astronomy
     George C. Comstock | D. Appleton and company, Published in 1901, 391 pages
128. The Geology of the Terrestrial Planets
     Michael H. Carr | NASA, Published in 1984, 322 pages
129. Space Nomads
     Leota Jean LaPaz, Lincoln LaPaz | Holiday House, Published in 1961, 199 pages
130. TASI Lectures: Introduction to Cosmology
     Mark Trodden, Sean M. Carroll | arXiv, Published in 2004, 82 pages
131. Planetary Science: A Lunar Perspective
     Stuart Ross Taylor | Lunar and Planetary Institute, Published in 1982
132. Curiosities of the Sky
     Garrett Putman Serviss | Harper & Brothers, Published in 1909, 300 pages
133. Practical Astronomy
     P. S. Michie, F. S. Harlow | John Wiley & Sons, Published in 1893, 246 pages
134. The Solar Magnetic Field
     Sami Solanki, Bernd Inhester, Manfred Schussler | arXiv, Published in 2010, 83 pages
135. Special Functions: Fractional Calculus and the Pathway for Entropy
     Hans J. Haubold (ed.) | MDPI AG, Published in 2018, 306 pages
136. Understanding Galaxy Formation and Evolution
     V. Avila-Reese | arXiv, Published in 2006, 50 pages
137. Traces of Catastrophe
     Bevan M French | Lunar and Planetary Institute, Published in 1998, 120 pages
138. Practical Astronomy for Engineers
     Frederick Hanley Seares | Stephens, Published in 1909, 160 pages
139. On the Origin (and Evolution) of Baryonic Galaxy Halos
     Duncan A. Forbes, Ericson D. Lopez | MDPI AG, Published in 2018, 232 pages
140. Black-Hole Phenomenology
     Neven Bilic | arXiv, Published in 2006, 58 pages
141. Quantization in Astrophysics, Brownian Motion, and Supersymmetry
     F. Smarandache, V. Christianto | MathTiger, Published in 2007, 516 pages
142. The Elements of Theoretical and Descriptive Astronomy
     Charles J. White | J. Wiley, Published in 1909, 322 pages
143. The Complete Idiot's Guide to The Sun
     Jay M. Pasachoff | Alpha, Published in 2003, 350 pages
144. Radiative Gas Dynamics
     David Weinberg | Ohio State University, Published in 2007
145. General Astronomy
     | Wikibooks, Published in 2009
146. Particle Physics and Inflationary Cosmology
     Andrei Linde | arXiv, Published in 2005, 270 pages
147. Hubble Space Telescope: Discoveries
     | NASA, Published in 2012, 128 pages
148. Mysteries of the Sun
     Ginger Butcher | NASA, Published in 2011, 20 pages
149. Large Scale Structure of the Universe
     Alison L. Coil | arXiv, Published in 2012, 43 pages
150. Great Astronomers
     Robert S. Ball | Isbister, Published in 1895, 392 pages
151. To See the Unseen: A History of Planetary Radar Astronomy
     Andrew J. Butrica | NASA History Division, Published in 1996, 301 pages
152. Elementary Astronomy
     James N. Pierce | , Published in 2013, 134 pages
153. An Introduction to Celestial Mechanics
     Richard Fitzpatrick | The University of Texas at Austin, Published in 2011, 216 pages
154. Mars Science Laboratory
     | Wikipedia, Published in 2014
155. Lunar Stratigraphy and Sedimentology
     John Lindsay | Elsevier, Published in 1976, 311 pages
156. Cosmology
     James Schombert | University of Oregon, Published in 2008
157. Guidebook to the Geology of Barringer Meteorite Crater, Arizona
     David A. Kring | Lunar and Planetary Institute, Published in 2007, 154 pages
158. Dense Matter in Compact Stars
     Andreas Schmitt | arXiv, Published in 2010, 146 pages
159. Resources of Near-Earth Space
     J. S. Lewis, M. S. Matthews | University of Arizona Press, Published in 1993, 977 pages
160. An Introduction to Cosmic Rays and Gamma-Ray Bursts
     A. De Rujula | arXiv, Published in 2007, 37 pages
161. Astronomy for Amateurs
     Camille Flammarion | D. Appleton and Company, Published in 1910
162. Voyager 1 and 2: Atlas of Six Saturnian Satellites
     Raymond M. Batson | NASA, Published in 1984, 175 pages
163. Voyager Encounters Jupiter
     | National Aeronautics and Space Administration, Published in 1979, 48 pages
164. Lecture Notes on High Energy Cosmic Rays
     M. Kachelriess | arXiv.org, Published in 2008, 82 pages
165. Protoplanetary Disks and Their Evolution
     Jonathan P. Williams, Lucas A. Cieza | arXiv, Published in 2011, 65 pages
166. String Cosmology
     James M. Cline | arXiv, Published in 2007, 47 pages
167. Black Holes
     P.K. Townsend | arXiv, Published in 1997, 145 pages
168. Astronomy of To-day
     Cecil Goodrich Julius Dolmage | Seeley and co., Published in 1910
169. Cosmology
     V. A. Rubakov | arXiv.org, Published in 2018, 56 pages
170. An Overview of the Solar System
     | Wikipedia, Published in 2013
171. The Planet Mars: A History of Observation and Discovery
     William Sheehan | University of Arizona Press, Published in 1996, 270 pages
172. The Hubble Constant
     Neal Jackson | arXiv, Published in 2014, 48 pages
173. Atomic and Molecular Processes in Astronomy and Planetary Science
     Geoffrey A. Blake | California Institute of Technology, Published in 2004
174. Lectures on Inflation and Cosmological Perturbations
     David Langlois | arXiv, Published in 2010, 56 pages
175. The Cosmological Constant
     Sean M. Carroll | arXiv, Published in 2000, 50 pages
176. A Photographic Atlas of Rock Breakdown Features in Geomorphic Environments
     Mary Bourke, Heather Viles | Planetary Science Institute, Published in 2007, 88 pages
177. Introduction to Cosmology
     A. D. Dolgov | arXiv, Published in 2009, 58 pages
178. Astronomical Image and Data Analysis
     J.-L. Starck, F. Murtagh | Springer, Published in 2006, 335 pages
179. Big Bang Nucleosynthesis and Physics Beyond the Standard Model
     Subir Sarkar | arXiv, Published in 1996, 156 pages
180. Observatories in Space
     Catherine Turon | arXiv, Published in 2011, 50 pages
181. Exoplanet Observing for Amateurs
     Bruce L. Gary | Reductionist Publications, Published in 2007, 170 pages
182. The Beginning and the End: The Meaning of Life in a Cosmological Perspective
     Clement Vidal | arXiv, Published in 2013, 356 pages
183. Supernova Remnants: The X-ray Perspective
     Jacco Vink | arXiv, Published in 2011, 78 pages
184. Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope
     Dylan Steele (ed.) | NASA, Published in 2015, 78 pages
185. When Biospheres Collide: A History of NASA's Planetary Protection Programs
     Michael Meltzer | NASA, Published in 2011, 542 pages
186. Introduction to Supersymmetry: Astrophysical and Phenomenological Constraints
     Keith A. Olive | arXiv, Published in 1999, 67 pages
187. Pioneers of Science
     Oliver Lodge | Macmillan and co, Published in 1905, 421 pages
188. The Cosmic Web: Geometric Analysis
     Rien van de Weygaert, Willem Schaap | arXiv, Published in 2007, 129 pages
189. Observational Probes of Cosmic Acceleration
     David H. Weinberg, et al. | arXiv, Published in 2012, 253 pages
190. The Formation and Evolution of the Solar System
     James Schombert | University of Oregon, Published in 2007
191. Handbook of Space Astronomy and Astrophysics
     Martin V. Zombeck | Cambridge University Press, Published in 2006, 780 pages
192. Stellar Atmospheres
     J. B. Tatum | , Published in 2006
193. Everything You Always Wanted To Know About The Cosmological Constant Problem
     Jerome Martin | arXiv, Published in 2012, 89 pages
194. The Search for Extraterrestrial Intelligence, SETI
     Philip Morrison, John Billingham, John Wolfe | NASA, Published in 1979, 293 pages
195. Mag 7 Star Atlas Project
     Andrew L. Johnson | , Published in 2007, 21 pages
196. Solar System
     | Wikipedia, Published in 2012, 646 pages
197. The Galactic Habitable Zone I. Galactic Chemical Evolution
     G. Gonzalez, D. Brownlee, P. Ward | arXiv, Published in 2001, 57 pages
198. Primer Of Celestial Navigation
     John Favill | Cornell Maritime Press, Published in 1944, 300 pages
199. Planetary Theory
     Ernest Brown, Clarence Shook | Cambridge University Press, Published in 1933, 323 pages
200. Introduction to Millimeter/Sub-Millimeter Astronomy
     T. L. Wilson | arXiv, Published in 2009, 106 pages
201. Recreations in Astronomy
     Henry White Warren | Project Gutenberg,
202. Inflation
     Marieke Postma | NIKHEF, Published in 2009, 53 pages
203. Introduction to Non-Baryonic Dark Matter
     Paolo Gondolo | arXiv, Published in 2004, 51 pages
204. Trans-Neptunian Objects: An Overview
     | Wikipedia, Published in 2014
205. Introduction to the Theory of Black Holes
     Gerard 't Hooft | Utrecht University, Published in 2009, 49 pages
206. Cosmology Primer
     Sean Carroll | preposterousuniverse.com, Published in 2012, 120 pages
207. Inflation and String Theory
     Daniel Baumann, Liam McAllister | arXiv, Published in 2014, 349 pages
208. Recent Developments in Gravitational Collapse and Spacetime Singularities
     Pankaj S. Joshi, Daniele Malafarina | arXiv, Published in 2012, 89 pages
209. Lectures on Black Holes, Topological Strings and Quantum Attractors
     Boris Pioline | arXiv, Published in 2007, 103 pages
210. Lopsided Spiral Galaxies
     Chanda J. Jog, Francoise Combes | arXiv, Published in 2008, 75 pages
211. Frequently Asked Questions about Calendars
     Claus Tøndering | , Published in 2008, 65 pages
212. Habitable Planets for Man
     Stephen H. Dole | RAND Corporation, Published in 1964, 176 pages
213. Introduction to Dark Matter Experiments
     R. W. Schnee | arXiv.org, Published in 2011, 64 pages
214. Astronomical Discovery
     Herbert Hall Turner | E. Arnold, Published in 1904, 225 pages
215. To a Rocky Moon: A Geologist's History of Lunar Exploration
     Don E. Wilhelms | University of Arizona Press, Published in 1993, 524 pages
216. Magnetic Fields, Strings and Cosmology
     Massimo Giovannini | arXiv, Published in 2006, 76 pages
217. The Fundamentals of Stellar Astrophysics
     George W. Collins, II | W H Freeman & Co, Published in 2003, 494 pages
218. Multi-messenger Astronomy and Dark Matter
     Las Bergstrom | arXiv, Published in 2012, 105 pages
219. A Handbook of Descriptive and Practical Astronomy
     George F. Chambers | Oxford At The Clarendon Press, Published in 1889, 756 pages
220. From Chaos to Consciousness: A Brief History of the Universe
     Mike Corwin | Bookboon, Published in 2015, 166 pages
221. Cosmos and Culture: Cultural Evolution in a Cosmic Context
     Steven J. Dick, Mark L. Lupisella | NASA, Published in 2010, 612 pages
222. A Simple Guide to Backyard Astronomy
     Carol Beigel | , Published in 2008, 61 pages
223. Celestial Navigation, Elementary Astronomy, Piloting
     Arturo Chiesa, Raffaele Chiesa | Sky and Sea Software, Published in 2010
224. Astrodynamics: A Compendium of Orbitology
     | Wikipedia, Published in 2013, 334 pages
225. Neutrinos and the Stars
     Georg Raffelt | arXiv, Published in 2012, 83 pages
226. Radiative Processes in High Energy Astrophysics
     Gabriele Ghisellini | arXiv, Published in 2012, 157 pages
227. Cosmology: The Study of the Universe
     | NASA, Published in 2009, 38 pages
228. Galaxy systems in the optical and infrared
     A. Biviano | arXiv, Published in 2008, 60 pages
229. Cosmic Rays and the Search for a Lorentz Invariance Violation
     Wolfgang Bietenholz | arXiv, Published in 2008, 81 pages
230. Chemistry in Protoplanetary Disks
     Thomas Henning, Dmitry Semenov | arXiv, Published in 2013, 84 pages
231. Cosmology for Particle Physicists
     U. A. Yajnik | arXiv, Published in 2008, 63 pages
232. Lunar Orbiter Photographic Atlas of the Moon
     D.E. Hughes, J.K. Bowker | Lunar and Planetary Institute, Published in 1971
233. Galaxies and the Expanding Universe
     James Schombert | University of Oregon, Published in 2008
234. Hours With A Three-Inch Telescope
     William Noble | Longmans, Green & Co., Published in 1887, 159 pages
235. Gamma-Ray Bursts: Progress, Problems and Prospects
     Bing Zhang, Peter Meszaros | arXiv, Published in 2008, 87 pages
236. The Foundations of Celestial Mechanics
     George W. Collins, II | Pachart Pub House, Published in 2004, 145 pages
237. Introduction to Early Universe Cosmology
     Robert H. Brandenberger | arXiv, Published in 2011, 70 pages
238. A Review of the Universe: Structures, Evolutions, Observations, and Theories
     | universe-review.ca, Published in 2009
239. Introduction to relativistic astrophysics and cosmology through Maple
     V. L. Kalashnikov | arXiv, Published in 2001, 124 pages
240. Ultrahigh Energy Cosmic Rays: Facts, Myths, and Legends
     Luis Alfredo Anchordoqui | arXiv, Published in 2011, 92 pages
241. Cosmic Journey: A History of Scientific Cosmology
     N. S. Hetherington, W. P. McCray | American Institute of Physics, Published in 2009