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Introduction to Astronomy

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Introduction to Astronomy

This textbook offers a broad introduction to astronomy, covering the structure and scale of the universe, the history of astronomical discovery, the motions of celestial bodies, light and telescopes, the solar system, stars and their life cycles, galaxies, and modern cosmology. It blends scientific concepts with observational tools and recent discoveries to help students understand the universe and humanity’s place within it.

Astronomy CosmologyPhysics
Author
Lumen Learning
Publisher
LibreTexts
Source
LibreTexts
License
CC BY
Language
EN
Category
Basic Sciences
Read online Download PDF (open licence)
Contents· 198 sections
  1. 01: Introduction to Astronomy
  2. 1.01: Module Introduction
  3. 1.02: Basic Objects in the Universe
  4. 1.03: Scale of the Cosmos
  5. 1.04: The Constellations
  6. 1.05: Other Patterns
  7. 02: Historical Astronomy
  8. 2.01: The Study of Science
  9. 2.02: What Time Is It
  10. 2.03: Ancient Observations
  11. 2.04: Contributions to Science
  12. 2.05: The Wanderers
  13. 2.06: Claudius Ptolemy
  14. 2.07: Astronomy and Astrology
  15. 2.08: The Birth of Modern Astronomy
  16. 2.09: Observations of Motion- Brahe Kepler and Galilei
  17. 2.10: Observations of the Heavens- Galileo
  18. 2.11: The Mathematical Finish- Newton
  19. 03: Motions of the Moon Sun and Stars
  20. 3.01: Motions of Objects
  21. 3.02: Our Night Sky
  22. 3.03: The Sun and the Moon
  23. 3.04: Seasons and Seasonal Changes
  24. 3.05: The Moon in our Skies
  25. 3.06: Eclipses
  26. 04: Light and Spectra
  27. 4.01: Looking at a rainbow what do you see
  28. 4.02: Thermal Radiation
  29. 4.03: The Electromagnetic Spectrum
  30. 4.04: Spectra
  31. 4.05: Moving Objects Spectra and the Doppler Effect
  32. 05: Telescope and Observing
  33. 5.01: The Telescope
  34. 5.02: Early Telescopes
  35. 5.03: Telescopic Observations
  36. 5.04: Telescope Optical Types
  37. 5.05: Telescope Mounts
  38. 5.06: Images from the Telescope
  39. 5.07: Space-Based Telescopes
  40. 5.08: Light Pollution
  41. 5.09: Space-based Telescope
  42. 5.10: Hubble Space Telescope
  43. 06: Solar System Formation and Other Stellar Systems
  44. 6.01: Our Solar System
  45. 6.02: The Nebular Theory
  46. 6.03: What is a Planet
  47. 6.04: The Nebular Theory- Other Important Evidence
  48. 6.05: The Nebular Theory- Proplyds
  49. 6.06: Systems and Extrasolar Planets
  50. 6.07: The Discovery of Extrasolar Planets
  51. 6.08: The Kepler Mission
  52. 6.09: What We Have Learned about Stellar Systems and Extrasolar Planets
  53. 6.10: The Circumstellar Habitable Zone
  54. 6.11: Some Interesting Exoplanets
  55. 6.12: Extrasolar Planets
  56. 07: The Rocky Planets
  57. 7.01: What do you think
  58. 7.02: Comparing Planets
  59. 7.03: Rocky Planets
  60. 7.04: Craters
  61. 7.05: Planet Mercury
  62. 7.06: Planet Venus
  63. 7.07: Planet Earth
  64. 7.08: Earths Moon
  65. 7.09: Planet Mars
  66. 7.10: Snow on Mars
  67. 7.11: A Martian Controversy
  68. 7.12: Martian Moons
  69. 7.13: Characteristics of the Solar Systems Rocky Planets
  70. 08: The Gas Giant Planets
  71. 8.01: What do you think
  72. 8.02: Gas Giant Planets
  73. 8.03: Rings
  74. 8.04: Planet Jupiter
  75. 8.05: Jupiters Satellites
  76. 8.06: Planet Saturn
  77. 8.07: Saturns Rings
  78. 8.08: Saturns Satellites
  79. 8.09: Planet Uranus
  80. 8.10: Planet Neptune
  81. 8.11: Gas Giant Planets and Select Satellites Overviews
  82. 09: Minor Bodies of the Solar System
  83. 9.01: Trans-Neptunian objects the Kuiper Belt and the Oort Cloud
  84. 9.02: The Oort Cloud and Kuiper Belt
  85. 9.03: What do you think
  86. 9.04: Minor Bodies
  87. 9.05: Asteroids
  88. 9.06: Brightest Asteroids Visible from Earth
  89. 9.07: Asteroid Classification
  90. 9.08: Meteoroids Meteors and Meteorites
  91. 9.09: Meteorites
  92. 9.10: The Impact of Meteorites
  93. 9.11: Comets
  94. 9.12: Comet Characteristics
  95. 9.13: Images of Comets
  96. 9.14: Comets in History
  97. 9.15: Scientific Advances
  98. 9.16: Halleys Comet
  99. 9.17: A Comet Impacts a Planet
  100. 9.18: The Centaurs- Are they Asteroids or Comets
  101. 9.19: Pluto
  102. 9.20: Eris
  103. 10: The Sun
  104. 10.01: What do you think
  105. 10.02: Fission and Fusion
  106. 10.03: Our Star the Sun
  107. 10.04: How the Sun Works
  108. 10.05: A Quick Guide to Solar FusionThe Proton-Proton Cycle
  109. 10.06: Solar Regions
  110. 10.07: Major Solar Features
  111. 10.08: Studying the Sun
  112. 10.09: The Dark Side of the Sun
  113. 10.10: The National Solar Observatory
  114. 10.11: NASAs Heliophysics Science Division
  115. 11: Stellar Properties
  116. 11.01: Module Introduction
  117. 11.02: Variable Stars
  118. 11.03: Cepheids
  119. 11.04: Cataclysmic Variables
  120. 11.05: Star Clusters
  121. 11.06: Consider this
  122. 11.07: The Unknown in Astronomy
  123. 11.08: Star and Celestial Object Characteristics
  124. 11.09: Distances to the Stars and other Celestial Objects
  125. 11.10: Stellar Distances
  126. 11.11: Everything is Moving
  127. 11.12: How Close are the Close-by Stars
  128. 11.13: Light-Years
  129. 11.14: Parsec Vs. Light-Year Measurement
  130. 11.15: Stellar and Celestial Object Brightness
  131. 11.16: Magnitude System
  132. 11.17: Celestial cartography
  133. 11.18: Planispheres
  134. 11.19: Star Colors
  135. 11.20: Spectral Type
  136. 11.21: Sample Spectral Types
  137. 11.22: The Hertzsprung-Russell Diagram
  138. 11.23: The Four Hertzsprung-Russell Diagram Stellar Groups
  139. 11.24: Types of Star Systems and Stars
  140. 12: Stellar Evolution
  141. 12.01: Star Life
  142. 12.02: Stellar Birth
  143. 12.03: Stellar Mass
  144. 12.04: Stellar Evolution
  145. 12.05: Low-Mass Stars
  146. 12.06: White Dwarf
  147. 12.07: Planetary Nebula
  148. 12.08: White Dwarfs and Neighbors
  149. 12.09: Nova Novae and Supernova
  150. 12.10: High-Mass Stars
  151. 12.11: Neutron stars
  152. 12.12: Neutron Star and Companion Star Scenario
  153. 12.13: High-Mass Star Stellar Endings
  154. 12.14: Gamma-Ray Bursts (GRBs)
  155. 13: Galaxies
  156. 13.01: What do you think
  157. 13.02: Galaxies
  158. 13.03: The History of Studying Galaxies
  159. 13.04: Hubbles Major Contributions
  160. 13.05: Hubbles Law
  161. 13.06: Classification of Galaxies
  162. 13.07: Elliptical Galaxies
  163. 13.08: Spiral Galaxies
  164. 13.09: Irregular Galaxies
  165. 13.10: Active Galaxies
  166. 13.11: Quasar-stellar Objects
  167. 13.12: Blazars- Quasar-like Object
  168. 13.13: Galaxies Distance and Age
  169. 13.14: The Ages of Galaxies and What that Reveals
  170. 13.15: Galactic Groups
  171. 13.16: Dark Matter
  172. 13.17: WIMPs and String Theory
  173. 13.18: Gravitational Lensing
  174. 14: The Milky Way Galaxy
  175. 14.01: What do you think
  176. 14.02: The Milky Way Our Home Galaxy
  177. 14.03: Milky Way Galaxy Satellites
  178. 14.04: Milky Way Galaxy Research
  179. 14.05: Galileo Galilei First to See the Milky Way Galaxy
  180. 14.06: The Milky Way Galaxys Shape
  181. 14.07: Andromeda Galaxy
  182. 14.08: X-Ray and Gamma-Ray of the Milky Way Galaxy
  183. 14.09: Earths Position within the Milky Way Galaxy
  184. 14.10: A Spinning Spiral
  185. 15: Cosmology
  186. 15.01: What do you think
  187. 15.02: In the beginning
  188. 15.03: Physical Cosmology
  189. 15.04: The Big Bang in Eras
  190. 15.05: The Planck Era
  191. 15.06: Big Bang Evidence
  192. 15.07: Recent Data on the Universe
  193. 15.08: Issues with the Big Bang
  194. 15.09: Beyond the Big Bang
  195. 15.10: What is Next for the Big Bang Theory
  196. 15.11: Questions Regarding the Eventual Fate of the Universe
  197. 15.12: Religious or Philosophical Cosmology
  198. 15.13: Views on Creation