The Milky Way and Andromeda Are on a Collision Course

question 4

Multiple Choice

The Milky Way and Andromeda are on a collision course.When will the initial collision happen?

• A) in about 4 million years
• B) in about 4 billion years
• C) in about 2.5 million years
• D) in about 400,000 years
• E) in about 13.7 billion years

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Definitions:

CPI (Consumer Price Index)

An index that measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.

Real Wages

Wages that have been adjusted for inflation, reflecting the actual purchasing power of the income earned from work.

Base Year

The base year is a specific point in time used as a reference or benchmark for economic or financial calculations, such as index numbers and inflation measurements.

Percentage Changed

A measure that calculates the degree of change over time, indicating growth or decline in specific variables.