oldest planetary nebula inside 500 million year old galactic cluster discovered planetary nebula

Astronomers have found the oldest visible planetary nebula (PN) inside a 500-million-year-old galactic open cluster (OC). The rare celestial jewel…

Science & Technology

Astronomers have found the oldest visible planetary nebula (PN) inside a 500-million-year-old galactic open cluster (OC). The rare celestial jewel…

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