What Would You Need to Measure About a Planetary Nebula

question 68

Multiple Choice

What would you need to measure about a planetary nebula to determine how long ago its parent star died?

• A) the mass of the white dwarf
• B) the mass and radius of the white dwarf
• C) the nebula's temperature and radius
• D) the nebula's radius and expansion velocity
• E) the composition of the gas in the nebula

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