Messier 57 - Der
Ringnebel
Links zu Messier 57
Planetary Nebula M57 (NGC 6720) bei SEDS
Deep-Sky Corner / Lyr / M57: Ring Nebula & IC 1296
Astronomical Drawings: Messier 57 - Ring Nebula
NASA - Ring Holds a Delicate Flower
Ringnebel - Wikipedia
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Messier 57
Ringnebel
Links zu Messier 57