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Unformatted text preview: Planetary Nebula or Supernova More complete surveys of the planetary nebulae, high-resolution images from the Hubble Space Telescope, and careful analysis of the various parts of the planetary nebulae have shown that planetary nebulae have much more complex structures. Many have bipolar outflows like the Dumbbell Nebula, Hourglass Nebula, and Eskimo Nebula whose different orientations of their poles with our line of sight cause the differences in their appearance as seen from the Earth. These nebula probably have equatorial rings or disks of material ejected during the red giant phase that force the material to flow perpendicular to the rings/disks. The two rings of the Hourglass Nebula (see the picture below) are centered along the star's poles that are oriented around 60 to our line of sight. The upper ring is around the pole that is coming towards us and the lower ring is around the pole that is oriented away from us. There is evidence that the Ring Nebula in Lyra is similar to the Hourglass Nebula except that we are viewing it from right along...
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