What Would You Need to Measure for a Planetary Nebula

question 2

Multiple Choice

What would you need to measure for a planetary nebula (see the image below) 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

---

Definitions:

Suppliers

Entities that provide goods or services to another entity, typically within a supply chain context.

Quantity Demanded

The total amount of a good or service that consumers are willing and able to purchase at a specific price level at a given period.

Demand Curve

Graph of the amount of a product that buyers will purchase at different prices.

Microeconomics

Study of small economic units, such as individual consumers, families, and businesses.