In Astronomical Terms,planetary Nebulae Are

question 280

Multiple Choice

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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