Planetary Nebulae

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/ˈplænəˌtɛri niːˈbjuːliː/

Planetary nebulae are not as airy and tranquil as their images suggest.
Until recently, it was thought that such shells around planetary nebulae were a rare phenomenon.
Planetary nebulae are a type of isolated gaseous nebulae possessing a fair degree of bilateral symmetry.
Astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae in the mid-1990s, including this one.
The intriguing result implies that the massive star's explosion has produced a shape similar to what is seen in some planetary nebulae associated with lower mass stars.

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