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staedtler staedtler
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7 years ago
In astronomical terms, planetary nebulae are
A)   very long-lived objects, having been in existence since just after the Big Bang at the beginning of the universe.
B)   relatively short-lived existing around the central white dwarf star for millions of years before slowly spreading into space.
C)   relatively long-lived since they form when the original stars form and remain as slowly rotating shells for the whole of their lifetimes of several billion years.
D)   very short-lived with lifetimes of about 50,000 years.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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discovererdiscoverer
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staedtler Author
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7 years ago
On behalf of my study group and I, thank you
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