Astronomy Picture of the Day Discover the cosmos! CallUrl('chandra>harvard>eduhtml',0), ~TildeLink(): Universe 101 () BBC: Space () How Stuff Works: Astronomy () Curious About Astronomy () MacTutor History of Mathematics Archive () About.com: Physics () Internet Encyclopedia of Science () Flash Modern Physics Tutorials () Physics for Future Presidents Lectures by Richard A. Muller, U.C. NASA: The National Aeronautics and Space Administration, which organizes space exploration on behalf of the government of the U.S.A. CallUrl('www>astronomy>netkidzworld>comipac>caltech>eduhtml',0), ~TildeLink() Lewis Research CenterCleveland, OhioINTRODUCTIONThis dictionary was orignally published as ~TildeLink() SP-7 in 1965. From the core outward, ~TildeLink() scientists believe, Saturn is composed of several identifiable layers. . One light-year is about 6 trillion miles (9 trillion km). CallUrl('www>jacanaent>comhtm',0), Original Image Credit: ~TildeLink() and ESACropped version above created by: Alexander J. Willman, Jr.Orbital Elements Semimajor Axis: ... CallUrl('www>princeton>edu<~willmannap>edutopastronomer>comphp',0), Chandra X-ray Observatory (CXO). Hubble reveals surprisingly intricate structures including concentric gas shells, jets of high-speed gas and unusual shock-induced knots of gas. Learning about the very first galaxies that formed after the big bang, like this one, helps us understand what the early universe was like. one giant leap for mankind." Credit: ~TildeLink()/JPL-Caltech/Space Science Institute ... CallUrl('www>solarsystemscope>comnasa>govpha>jhu>eduhtml',0), Cassini-Huygens mission - The ~TildeLink() Cassini-Huygens spacecraft was launched on October 1997 and arrived at Saturn in 2006.CCD - Abbreviation for charge-coupled device, which is a semiconductor chip found in digital cameras that takes the place of film. CallUrl('www>ivoa>nethtml',0), OPTICAL - ~TildeLink() image (HST?) All of the other stars we can see with our eyes are farther, some even thousands of light-years away. It is one of the first galaxies ever formed in the universe. The science goals of the SMD Astrophysics Division are breathtaking: we seek to understand the universe and our place in it. The oldest one found so far in GN-z11 (shown in the close up image). CallUrl('www>crystalinks>comhtml',0), ~TildeLink()'s Ask-A-Scientist Astronomy Archive provides short (about a paragraph but sometimes a page) answers to many commonly asked questions in astronomy.