Approximately How Many Earth-Sized Planets Are Believed to Exist in the Milky

question 99

Multiple Choice

Approximately how many Earth-sized planets are believed to exist in the Milky Way Galaxy?

• A) a few dozen
• B) several thousand
• C) several million
• D) several billion

---

Definitions:

Infant Mortality

The death of young children under the age of 1 year, expressed per 1,000 live births and used as a standard measure of a region's health and development.

Chinese Farmer

describes a person engaged in agriculture in China, often working on small-scale family-owned farms, dealing with the challenges of modernization and policy changes.

SARS Virus

The Severe Acute Respiratory Syndrome virus is a contagious and sometimes fatal respiratory illness caused by a coronavirus.

HIV/AIDS

Human Immunodeficiency Virus (HIV) is a virus that attacks the immune system; Acquired Immune Deficiency Syndrome (AIDS) is the most advanced stage of HIV infection.