First Sentence:
Planetary nebulae are expanding gaseous envelopes of enormous size in the centre of which the so-called nucleus of the nebula a high temperature star, the source of the excitation of the nebula's light emission is located.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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decrement diagram, high excitation nebulae, low excitation nebulae, excitation class, helium nebulae, infrared forbidden lines, optically thick nebulae, optically thin nebula, dynamical separation, given nebula, ionization formula, former nuclei, nebula increases, nova envelopes, volume emission coefficient, neutral envelope, infrared emission lines, nebular conditions, nucleus temperature, individual nebulae, interstellar extinction, dilution coefficient, nuclei temperatures, expanding nebula, lust particles
Key Phrases - Capitalized Phrases (CAPs):
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Rayleigh Taylor, Hubble Space Telescope, Magellanic Clouds, Mira Ceti, Nova Aquila, Small Magellanic Cloud, Theoretical Continuous Spectra of Nebulae, New Class of Nebulae
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