For Which Factor in the Drake Equation Do We Actually

question 66

Multiple Choice

For which factor in the Drake equation do we actually have observational knowledge rather than just a speculative estimate?

• A) R*, the rate at which solar-type stars form in the Galaxy
• B) fl, the fraction of Earthlike planets on which life actually arises
• C) fᵢ, the fraction of life-forms that evolve into intelligent species
• D) fc, the fraction of intelligent species that develop adequate technology and then choose to send messages out into space

---

Definitions:

GDP

Gross Domestic Product, the total market value of all final goods and services produced within a country in a specific time period, serving as a broad measure of economic activity.

Economy's Production

The total value of all goods and services produced within an economy over a specific time period.

Goods and Services

The physical items (goods) and activities (services) that satisfy human wants and needs and are offered in the marketplace for purchase.

GDP

Gross Domestic Product signifies the total monetary value of all goods and services produced within a country's boundaries over a predetermined time frame, reflecting the nation's economic health.