http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?f4-type%3DArtwork;f5-associated-Lesson%3DGamma%20Ray%20Impact Results for your query: f4-type=Artwork;f5-associated-Lesson=Gamma Ray Impact Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/Neutron_Star_Merge_H264_High_960x540/Neutron_Star_Merge_H264_High_960x540.dc.xml Gamma-ray bursts are common, yet random, and fleeting events that have mystified astronomers since their discovery in the late 1960s. Shorter bursts (less than two seconds in duration) are thought to be caused by mergers of binary systems with black holes or neutron stars. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/Neutron_Star_Merge_H264_High_960x540/Neutron_Star_Merge_H264_High_960x540.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/a010300_NeutronStar_NTSC/a010300_NeutronStar_NTSC.dc.xml Gamma-ray flares from SGR J1550-5418 may arise when the magnetar's surface suddenly cracks, releasing energy stored within its powerful magnetic field. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/a010300_NeutronStar_NTSC/a010300_NeutronStar_NTSC.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/aristotle-solar-system/aristotle-solar-system.dc.xml Illustration of Oronce Fine, Astronomy personified and an armillary sphere. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/aristotle-solar-system/aristotle-solar-system.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/ptolemy_cosmos/ptolemy_cosmos.dc.xml This image depicts the slow evolution of thought about the physics of the solar system in the mid-17th century. The shield on the left represents Copernicus's view of the Universe (1543) with the Sun at the center of the Universe and all of the planets, including the Earth moving around it. Copernicus's model was opposed by the Church which held that the Earth was the center of the Universe. The shield on the right depicts Tycho Brahe's model of the Universe (1588) which reconciles the Copernican model with the early Ptolemaic model (ca. 150) in which the Sun, Moon, planets, and stars all revolve around the Earth. Brahe's model allows that the other planets revolve around the Sun, but maintains that the Earth is the stationary center of the Universe around which the Sun, dragging all of the planets with it, as well as the Moon, revolve. Brahe's shield carries more weight (tilts the balance) in this picture because the Church, a powerful arbiter of scientific thought in the 17th century, supported Brahe's mode... http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/ptolemy_cosmos/ptolemy_cosmos.dc.xml Thu, 01 Jan 1970 12:00:00 GMT