Strong Evidence for the Existence of Planetary Systems in the Process

question 80

Multiple Choice

Strong evidence for the existence of planetary systems in the process of formation around other stars comes from

• A) spectroscopic evidence of large quantities of molecules such as ammonia and methane, which can exist only in planetary atmospheres.
• B) images and infrared observations of disks of dust.
• C) detection of very regular pulses of radio energy from some stars.
• D) direct photography of actual planets near other stars.

---

Definitions:

Rummage Sale

A sale event, often organized by a community or organization, where used goods are sold, typically to raise funds.

Current GDP

The market value of all final goods and services produced within a country in a given period, measured without adjusting for inflation.

Inventory

The sum of all goods and materials held by a company in stock, including raw materials, work-in-progress, and finished goods.

Investment Expenditures

Spending on capital goods by firms and households which will be used for future production of goods and services.