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...in the [[Perseus]] arm of the [[Milky Way Galaxy]] in the constellation [[Cassiopeia]]. This is an emission nebula showing glowing gas and darker dust lanes. Th

...ining the term [[nova]] for a "new" star (we now know that Tycho's star in Cassiopeia was a [[supernova]] 7500 [[Light-year|light years]] from earth). This disco

...y interest in resolving, as so much of it is found near the destroyed star Cassiopeia A. We ask the reader to page down to the next section to determine what els [[File:17th_c_supernova300.jpg|right|frame|<center>The Remnants of Cassiopeia A today (Hubble)</center>]]