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