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- Thu Jan 22, 2009 11:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: NGC 2818: Planetary Nebula within Cluster (2009 Jan 22)
- Replies: 9
- Views: 1896
Re: NGC 2818: Planetary Nebula within Cluster (2009 Jan 22)
"NGC 2818 is one of very few planetary nebulae in our galaxy located within an open cluster. Open clusters, in general, are loosely bound and they disperse over hundreds of millions of years. Stars that form planetary nebulae typically live for billions of years. Hence, it is rare that an open...