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Planetary Nebula
What in the Universe: Ghost of Jupiter Nebula
Celestial Tour: Monsters in Deep Space
Exploring Strangely Shaped Nebulae
In a Different Light: Helix Nebula
Celestial Tour: A Star’s Fight for Life—Star Life Cycles
At a Glance: Types of Nebulae
Above and Beyond: Planetary Nebula NGC 2440
Myth vs Reality: Shapes of Planetary Nebulae
Myth vs Reality: What Is a Planetary Nebula?
At a Glance: Shapes of Planetary Nebulae
Celestial Tour: Planetary Nebulae—Sculptures in the Sky
Above and Beyond: Cat’s Eye Nebula
Above and Beyond: Planetary Nebula NGC 6302
Insight Into: The Fate of the Sun
Image Tour: The Cat's Eye Nebula