Astronomers Discover Oldest Planetary Nebula Inside 500 Million-Year-Old Galactic Cluster - ABP Live Astronomers have discovered the oldest planetary nebula in a 500 million-year-old open galactic cluster. The nebula is a 'rare beauty with a hot blue heart'. It has a kinematic age of 70,000 years. Author : Radifah Kabir

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Last-modified: 2022-09-12 (月) 04:18:05 (599d)