The Milky Wa1 - measuring the Milky Way's parallax, [20]...

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The Milky Way Galactic Center of the Milky Way The Greek philosopher Democritus (450–370 BC) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. [17] Aristotle (384–322 BC), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of some stars which were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere , in the region of the world which is continuous with the heavenly motions ." [18] The Neoplatonist philosopher Olympiodorus the Younger (c. 495–570 AD) criticized this view, arguing that if the Milky Way were sublunary it should appear different at different times and places on the Earth, and that it should have parallax , which it does not. In his view, the Milky Way was celestial. This idea would be influential later in the Islamic world . [19] The Arabian astronomer , Alhazen (965–1037), made the first attempt at observing and
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Unformatted text preview: measuring the Milky Way's parallax, [20] and he thus "determined that because the Milky Way had no parallax, it was very remote from the Earth and did not belong to the atmosphere." [21] The Persian astronomer Ab Rayhn al-Brn (9731048) proposed the Milky Way galaxy to be "a collection of countless fragments of the nature of nebulous stars." [22] [23] The Andalusian astronomer Ibn Bajjah ("Avempace", d. 1138) proposed that the Milky Way was made up of many stars that almost touch one another and appear to be a continuous image due to the effect of refraction from sublunary material, [18] [24] citing his observation of the conjunction of Jupiter and Mars as evidence of this occurring when two objects are near. [18] The Syrian-born Ibn Qayyim Al-Jawziyya (12921350) proposed the Milky Way galaxy to be "a myriad of tiny stars packed together in the sphere of the fixed stars...
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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