Local crab vs. the Helix Nebula

The former is a local crab. Discovered by me and will probably only ever get a mention in its lifetime in this post. Radius around 5 cm. The later is the Helix Nebula located 650 light-years away in constellation Aquarius. Discovered by Karl Ludwig Harding, probably before 1824. (according to wikipedia). Often been refered to as the eye of the God. Radius 2.87 light years. Image Courtesy ...

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Local crab vs. the Helix Nebula

Light Echo

Posted on 24 August 2008

Light Echo
Image Courtesy NASA/JPL-Caltech It's interesting to know that light too *echos*. This document , hosted at caltech, is worth a read on how modern telescopes detect light emitting from eminating from a cosmic event hundreds of years later. The images towards the bottom show what astronomers observed in the space surrounding the Cassiopeia A supernova remnant.
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