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SlideshowReport

Some Shapes of Planetary Nebulae

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Some Shapes of Planetary Nebulae
(b) The Helix Nebula, NGC 7293, located in the constellation Aquarius, about 700 ly (215 pc) from Earth, has an angular diameter equal to
about half that of the full Moon. Red gas is mostly hydrogen and nitrogen, whereas the blue gas is rich in oxygen.
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