• 👁 Image 1An amateur astrophotography setup with an automated guide system connected to a laptop (from Observational astronomy)
  
  Image 1An amateur astrophotography setup with an automated guide system connected to a laptop (from Observational astronomy)
• 👁 Image 2An image of the Cat's Paw Nebula created combining the work of professional and amateur astronomers. The image is the combination of the 2.2-metre MPG/ESO telescope of the La Silla Observatory in Chile and a 0.4-meter amateur telescope. (from Amateur astronomy)
  
  Image 2An image of the Cat's Paw Nebula created combining the work of professional and amateur astronomers. The image is the combination of the 2.2-metre MPG/ESO telescope of the La Silla Observatory in Chile and a 0.4-meter amateur telescope. (from Amateur astronomy)
• 👁 Image 350 cm refracting telescope at Nice Observatory (from Observational astronomy)
  
  Image 350 cm refracting telescope at Nice Observatory (from Observational astronomy)
• 👁 Image 4Amateur astronomer recording observations of the sun. (from Amateur astronomy)
  
  Image 4Amateur astronomer recording observations of the sun. (from Amateur astronomy)
• 👁 Image 5Historical Jantar Mantar observatory in Jaipur, India (from History of astronomy)
  
  Image 5Historical Jantar Mantar observatory in Jaipur, India (from History of astronomy)
• 👁 Image 6The Nebra sky disk, Germany, 1800–1600 BC (from History of astronomy)
  
  Image 6The Nebra sky disk, Germany, 1800–1600 BC (from History of astronomy)
• 👁 Image 7The Hubble Space Telescope (from History of astronomy)
  
  Image 7The Hubble Space Telescope (from History of astronomy)
• 👁 Image 8Places like Paranal Observatory offer crystal clear skies for observing astronomical objects with or without instruments. (from Amateur astronomy)
  
  Image 8Places like Paranal Observatory offer crystal clear skies for observing astronomical objects with or without instruments. (from Amateur astronomy)
• 👁 Image 9Mayall telescope at Kitt Peak National Observatory (from Observational astronomy)
  
  Image 9Mayall telescope at Kitt Peak National Observatory (from Observational astronomy)
• 👁 Image 10Amateur astronomy groups are often involved in outreach to introduce astronomy to the general public (from Amateur astronomy)
  
  Image 10Amateur astronomy groups are often involved in outreach to introduce astronomy to the general public (from Amateur astronomy)
• 👁 Image 11The main platform at La Silla hosts a huge range of telescopes with which astronomers can explore the Universe. (from Observational astronomy)
  
  Image 11The main platform at La Silla hosts a huge range of telescopes with which astronomers can explore the Universe. (from Observational astronomy)
• 👁 Image 12"El Caracol" observatory temple at Chichen Itza, Mexico (from History of astronomy)
  
  Image 12"El Caracol" observatory temple at Chichen Itza, Mexico (from History of astronomy)
• 👁 Image 13An assembly in Estonia to observe meteors (from Observational astronomy)
  
  Image 13An assembly in Estonia to observe meteors (from Observational astronomy)
• 👁 Image 14Ultra HD photography taken at La Silla Observatory (from Observational astronomy)
  
  Image 14Ultra HD photography taken at La Silla Observatory (from Observational astronomy)
• 👁 Image 15The inflationary theory as an augmentation to the Big Bang theory was first proposed by Alan Guth of MIT. Inflation solves the 'horizon problem' by making the early universe much more compact than was assumed in the standard model. Given such smaller size, causal contact (i.e., thermal communication) would have been possible among all regions of the early universe. The image was an adaptation from various generic charts depicting the growth of the size of the observable universe, for both the standard model and inflationary model respectively, of the Big Bang theory. (from Physical cosmology)
  
  Image 15The inflationary theory as an augmentation to the Big Bang theory was first proposed by Alan Guth of MIT. Inflation solves the 'horizon problem' by making the early universe much more compact than was assumed in the standard model. Given such smaller size, causal contact (i.e., thermal communication) would have been possible among all regions of the early universe. The image was an adaptation from various generic charts depicting the growth of the size of the observable universe, for both the standard model and inflationary model respectively, of the Big Bang theory. (from Physical cosmology)
• 👁 Image 16Artist conception of the Big Bang cosmological model, the most widely accepted out of all in physical cosmology (neither time nor size to scale) (from Physical cosmology)
  
  Image 16Artist conception of the Big Bang cosmological model, the most widely accepted out of all in physical cosmology (neither time nor size to scale) (from Physical cosmology)
• 👁 Image 17This image contains two side-by-side pictures of the night sky comparing the effects of light pollution on the visibility of celestial objects. (from Amateur astronomy)
  
  Image 17This image contains two side-by-side pictures of the night sky comparing the effects of light pollution on the visibility of celestial objects. (from Amateur astronomy)
• 👁 Image 18Arabic astrolabe from 1079 to 1080 AD (from History of astronomy)
  
  Image 18Arabic astrolabe from 1079 to 1080 AD (from History of astronomy)
• 👁 Image 19The Crab Nebula as seen in various wavelengths (from Observational astronomy)
  
  Image 19The Crab Nebula as seen in various wavelengths (from Observational astronomy)
• 👁 Image 20An example of a gravitational lens found in the DESI Legacy Surveys data. There are four sets of lensed images in DESI-090.9854-35.9683, corresponding to four distinct background galaxies—from the outermost giant red arc to the innermost bright blue arc, arranged in four concentric circles. All of them are gravitationally warped—or lensed—by the orange galaxy at the very center. Dark matter is expected to produce gravitational lensing also. (from Physical cosmology)
  
  Image 20An example of a gravitational lens found in the DESI Legacy Surveys data. There are four sets of lensed images in DESI-090.9854-35.9683, corresponding to four distinct background galaxies—from the outermost giant red arc to the innermost bright blue arc, arranged in four concentric circles. All of them are gravitationally warped—or lensed—by the orange galaxy at the very center. Dark matter is expected to produce gravitational lensing also. (from Physical cosmology)
• 👁 Image 21A map of the southern celestial hemisphere, also by Bayer (from History of astronomy)
  
  Image 21A map of the southern celestial hemisphere, also by Bayer (from History of astronomy)
• 👁 Image 229th-century diagram of the positions of the seven planets on 18 March 816, from the Leiden Aratea (from History of astronomy)
  
  Image 229th-century diagram of the positions of the seven planets on 18 March 816, from the Leiden Aratea (from History of astronomy)
• 👁 Image 23Sunset at the equinox from the prehistoric site of Pizzo Vento at Fondachelli Fantina, Sicily (from History of astronomy)
  
  Image 23Sunset at the equinox from the prehistoric site of Pizzo Vento at Fondachelli Fantina, Sicily (from History of astronomy)
• 👁 Image 24ALMA is the world's most powerful telescope for studying the Universe at submillimeter and millimeter wavelengths. (from Observational astronomy)
  
  Image 24ALMA is the world's most powerful telescope for studying the Universe at submillimeter and millimeter wavelengths. (from Observational astronomy)
• 👁 Image 25Babylonian tablet in the British Museum recording Halley's Comet in 164 BC (from History of astronomy)
  
  Image 25Babylonian tablet in the British Museum recording Halley's Comet in 164 BC (from History of astronomy)
• 👁 Image 26One of the Oldest Observatories in South America is the Quito Astronomical Observatory, founded in 1873 and located 12 minutes south of the Equator in Quito, Ecuador. The Quito Astronomical Observatory is the National Observatory of Ecuador and is located in the Historic Center of Quito and is managed by the National Polytechnic School. (from Observational astronomy)
  
  Image 26One of the Oldest Observatories in South America is the Quito Astronomical Observatory, founded in 1873 and located 12 minutes south of the Equator in Quito, Ecuador. The Quito Astronomical Observatory is the National Observatory of Ecuador and is located in the Historic Center of Quito and is managed by the National Polytechnic School. (from Observational astronomy)
• 👁 Image 27History of the Universe – gravitational waves are hypothesized to arise from cosmic inflation, a rapidly accelerated expansion just after the Big Bang (from Physical cosmology)
  
  Image 27History of the Universe – gravitational waves are hypothesized to arise from cosmic inflation, a rapidly accelerated expansion just after the Big Bang (from Physical cosmology)
• 👁 Image 28Sir Patrick Moore was one of the world's leading popularisers of astronomy. (from Amateur astronomy)
  
  Image 28Sir Patrick Moore was one of the world's leading popularisers of astronomy. (from Amateur astronomy)
• 👁 Image 29Map of the Milky Way Galaxy, with the constellations that cross the galactic plane in each direction and the known prominent components annotated including main arms, spurs, bar, nucleus/bulge, notable nebulae and globular clusters (from History of astronomy)
  
  Image 29Map of the Milky Way Galaxy, with the constellations that cross the galactic plane in each direction and the known prominent components annotated including main arms, spurs, bar, nucleus/bulge, notable nebulae and globular clusters (from History of astronomy)
• 👁 Image 30Megaliths from Nabta Playa, constructed by Neolithic populations, located in Aswan, Upper Egypt. Excavations of the megalith structures were completed in 2008. (from History of astronomy)
  
  Image 30Megaliths from Nabta Playa, constructed by Neolithic populations, located in Aswan, Upper Egypt. Excavations of the megalith structures were completed in 2008. (from History of astronomy)
• 👁 Image 31Segment of the astronomical ceiling of Senenmut's Tomb (circa 1479–1458 BC), depicting constellations, protective deities, and twenty-four segmented wheels for the hours of the day and the months of the year (from History of astronomy)
  
  Image 31Segment of the astronomical ceiling of Senenmut's Tomb (circa 1479–1458 BC), depicting constellations, protective deities, and twenty-four segmented wheels for the hours of the day and the months of the year (from History of astronomy)
• 👁 Image
  
  Image 32Calendrical functions of the Berlin Gold Hat c. 1000 BC (from History of astronomy)
• 👁 Image 33A voting session is conducted in 2006 International Astronomical Union's general assembly for determining a new definition of a planet (from Astronomer)
  
  Image 33A voting session is conducted in 2006 International Astronomical Union's general assembly for determining a new definition of a planet (from Astronomer)
• 👁 Image 34Overview of types of observational astronomy by observed wavelengths and their observability. (from Observational astronomy)
  
  Image 34Overview of types of observational astronomy by observed wavelengths and their observability. (from Observational astronomy)
• 👁 Image 35Comparison of CMB (Cosmic microwave background) results from satellites COBE, WMAP and Planck documenting a progress in 1989–2013 (from History of astronomy)
  
  Image 35Comparison of CMB (Cosmic microwave background) results from satellites COBE, WMAP and Planck documenting a progress in 1989–2013 (from History of astronomy)
• 👁 Image 36A map of the northern celestial hemisphere from Johann Bayer's 1661 edition of Uranometria, the first atlas to feature star charts covering the entire celestial sphere (from History of astronomy)
  
  Image 36A map of the northern celestial hemisphere from Johann Bayer's 1661 edition of Uranometria, the first atlas to feature star charts covering the entire celestial sphere (from History of astronomy)

Things you can do

Wikibooks

These books may be in various stages of development. See also the related Science and Mathematics bookshelves.

• Astronomy
• GAT: A Glossary of Astronomical Terms
• Introduction to Astrophysics
• General relativity
• Observing the Sky from 30°S
• Observing the Sky from 40°N

• Solar System