All planetary nebulae are slowly expanding spherical disks ejected by red giants, while theirexposed cores appear as white dwarfs.

Name: All planetary nebulae are slowly expanding spherical disks ejected by red giants, while theirexposed cores appear as white dwarfs.
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Planetary nebulae are not always spherical; they can have various shapes, including bipolar and elliptical. The exposed cores of red giants become white dwarfs, but the nebulae themselves can have diverse morphologies.

All Planetary Nebulae Are Slowly Expanding Spherical Disks Ejected by Red