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Telescope
Galileio is credited with the invention, although he really just improved the design, and use of the Telescope. Galileo was the first to use a telescope for astronomy in 1609. He discovered that the band across the sky, the Milky Way, is composed with a countless amount of stars. "Galaxy." World of Scientific Discovery. Gale, 1999. Science in Context. Web. 12 Dec. 2013. -
Thomas Wright
Thomas Wright was the first person to suggst that our sun was just a single star within a system of many more. "Galaxy." World of Scientific Discovery. Gale, 1999. Science in Context. Web. 12 Dec. 2013. -
Immanuel Kant
In 1755, Immanuel Kant published his book. In this book he suggests that the Milky Way Galaxy was a group of stars in a lens shape. He also had the idea that there were others like it. The idea was there were more "island universes". "Galaxy." World of Scientific Discovery. Gale, 1999. Science in Context. Web. 12 Dec. 2013. -
William Herschel
William Herschel, through many observations, determied the shape of the galaxy to be like a grindstone or giant lens. He placed the sun at the center. "Galaxy." World of Scientific Discovery. Gale, 1999. Science in Context. Web. 12 Dec. 2013. -
Hubble
In 1923 all star systems were thought to belong to the Milky Way Galaxy. Hubble determined that the light curve of a type of variable star in the Andromeda Galaxy. Galaxies now became viewed as "beyond the Milky Way". Goldstein, Alan. "Target Hubble's Galaxy Classes." Astronomy 41.5 (2013): 50. MAS Ultra - School Edition. Web. 12 Dec. 2013. -
Classification System is Developed
Hubble defined a classification system for the nature and organization of galaxies in his book The Realm of Nebulae. His diagram shows Elliptical and lenticular galaxies. Any form not represented in the diagram is an irregular galaxy. Goldstein, Alan. "Target Hubble's Galaxy Classes." Astronomy 41.5 (2013): 50. MAS Ultra - School Edition. Web. 12 Dec. 2013. -
Revised Classification
Allan Sandage revised Hubble's system and published The Hubble Atlas of Galaxies. This included pictures from telescopes on Palomar Mountain. Goldstein, Alan. "Target Hubble's Galaxy Classes." Astronomy 41.5 (2013): 50. MAS Ultra - School Edition. Web. 12 Dec. 2013. -
Revolutionixing Galaxy Hunting
The Hubble Space Telescope got a brand new camera. This enables the telescope to see very red lght and is it much more efficiant. This camera is called Wide Field 3. It has enabled researchers to find galaxies from down to 450 million years or less after the Big Bang. The researchers had been at about 780 million years before this new camera. They are hoping to discover "cosmic dawn".
Watson, Traci. "The latest space race." USA Today 26 Nov. 2013: 05A. Science in Context. Web. 12 Dec. 2013. -
New Galaxy
In October 2013, scientists using information from the Hubble Space Telescope announced identification of a galaxy about 30 billion light years away. This is an important discovery because it adds evidence to the expansion of the universe. "Galaxies." Earth Sciences for Students. Detroit: Macmillan Reference USA, 2008. Science in Context. Web. 10 Dec. 2013.
