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scitechdaily.com
Astronomy & Astrophysics 101: Planetary Nebula
What Is a Planetary Nebula? A planetary nebula is a region of cosmic gas and dust formed from the cast-off outer layers of a dying star. Despite their name, planetary nebulae actually have nothing to do with planets. Intermediate-mass stars have a mass between 80% and 800% of the Sun’s mass. When
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