Why Is the Universe Expanding

question 135

Multiple Choice

Why is the universe expanding?

• A) The energy from all the stars is heating the universe, making it expand like a gas that is heated.
• B) Spacetime itself is expanding, carrying the galaxies (or superclusters of galaxies) with it.
• C) The universe is not expanding-it is we who are getting smaller, making the universe seem bigger and bigger.
• D) An infinitely dense clump of matter exploded, sending the galaxies (or superclusters of galaxies) hurtling out through space.

---

Definitions:

Economic Efficiency

An optimal distribution of resources in an economy, where no one can be made better off without making someone else worse off.

Marginal Cost

Marginal cost is the cost incurred by producing one additional unit of a good or service, reflecting changes in variable cost.

Minimum Acceptable Price

The lowest price at which a seller is willing to sell a product or service, often covering at least the costs of production.

Wages

Payments made to employees based on the hours worked or the amount of work done, often referred to as compensation for labor services rendered.