In another amazingly gorgeous image, Hubble has captured a unique planetary nebula nested inside an open star cluster. Both the cluster (NGC 2818A) and the nebula (NGC 2818) reside over 10,000 light-years away, in the southern constellation Pyxis (the Compass). This spectacular structure contains the outer layers of a sun-like star that were sent off into interstellar space during the star’s final stages of life. These glowing gaseous shrouds were shed by the star after it ran out of fuel to sustain the nuclear reactions in its core. Our own sun will undergo a similar process, but not for another 5 billion years or so. But what a beautiful way to go!
More about this image:
The image was taken in November 2008 with the Wide Field Planetary Camera 2. NGC 2818 is one of very few planetary nebulae in our galaxy located within an open cluster. The colors in the image represent a range of emissions coming from the clouds of the nebula: red represents nitrogen, green represents hydrogen, and blue represents oxygen.
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 cluster survives long enough for one of its members to form a planetary nebula. This open cluster is particularly ancient, estimated to be nearly one billion years old.
Planetary nebulae can have extremely varied structures. NGC 2818 has a complex shape that is difficult to interpret. However, because of its location within the cluster, astronomers have access to information about the nebula, such as its age and distance, that might not otherwise be known.
Planetary nebulae fade away gradually over tens of thousands of years. The hot, remnant stellar core of NGC 2818 will eventually cool off for billions of years as a white dwarf.