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