Stardust

Nebulae are simply clouds of gas and dust, but they can be created in various ways. Emission and reflection nebulae are the stuff of which stars are made—often enriched with the remains of previous stellar generations. They become visible when the fierce radiation from stars embedded within them makes them glow, or when they reflect the light of nearby stars. Dark nebulae are simply dense dust clouds that form a silhouette in front of more distant reflection nebulae or star clouds. Planetary

THE CAT'S EYE NEBULA

The complex symmetry of this beautiful planetary nebula has been created by a succession of bubbles of dust and gas ejected from its central star.

nebulae and supernova remnants are the glowing material flung off by stars during events late in their lifetimes.

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