Cassiopeia A Light Echoes in Infrared

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zorg.ch #75404 by [z]Barbara Harris @ 16.06.2005 00:00 - nach oben - Cassiopeia A Light Echoes in Infrared Explanation: Why is the image of Cassiopeia A changing? Two images of the nearby supernova remnant taken a year apart in infrared light appear to show outward motions at tremendous speeds. This was unexpected since the supernova that created the picturesque nebula was seen 325 years ago. The reason is likely light echoes. Light from the supernova heated up distant ambient dust that is just beginning to show its glow. As time goes by, more distant dust lights up, giving the appearance of outward motion. The above image is a composite of X-ray, optical, and infrared light exposures that have been digitally combined. The infrared light image was taken by the orbiting Spitzer Space Telescope and was used in the discovery of the light echo. The portion of Cassiopeia A shown spans about 15 light years and lies 10,000 light years away toward the constellation of Cassiopeia. Credit & Copyright zorg.ch #75430 by [z]Duke @ 16.06.2005 13:25 - nach oben - warum habne wir eigentlich ein APOY ? Astronomy Picture of Yesterday ? auf der APOD Seite ist ein anderes zu sehen, nämlich das Jubiläumsbild, welches heute ist... naja vermutlich weil die amis um CEST 0:00 halt noch gestern haben oder so.... freuen wir uns also auf morgen und das jubiläumsbild.. zorg.ch #75434 by freiländer @ 16.06.2005 14:08 - nach oben - richtig! genau drum isch da so.