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Fraser
2019-Sep-05, 09:30 PM
About 10,000 light years away, in the constellation Centaurus, is a planetary nebula called NGC 5307. A planetary nebula is the remnant of a star like our Sun, when it has reached what can be described as the end of its life. This Hubble image of NGC 5307 not only makes you wonder about the …
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Hornblower
2019-Sep-05, 10:49 PM
In my opinion it is poorly written concerning the mass loss. It is not always clear what is being lost as radiant energy and what is being expelled from the envelope at various stages.