In Astronomical Terms,planetary Nebulae

question 59

Multiple Choice

In astronomical terms,planetary nebulae

• A) exist around their central white dwarf stars for millions of years before slowly spreading into space.
• B) are relatively long-lived because they form when the original stars form and remain as slowly rotating shells for the whole of the star's lifetime of several billion years.
• C) are very short-lived,with lifetimes of about 50,000 years.
• D) are very long-lived objects,having been in existence since the Big Bang at the beginning of the universe.

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