The Measurement of Cosmic Distances Was Helped Tremendously by the Discovery

question 26

Multiple Choice

The measurement of cosmic distances was helped tremendously by the discovery, in the early part of the 20th century, that in Cepheid variable stars, the average luminosity was related to:

• A) their radial velocity
• B) the abundance of hydrogen in their atmospheres
• C) their distance from the Sun
• D) the length of time they took to vary
• E) their parallax

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Definitions:

Believing in Oneself

Confidence in one's own abilities and decisions, often leading to greater perseverance and success in tasks.

Courage to Take Risks

The bravery to engage in actions or decisions that involve uncertainty or potential for failure.

Entrepreneurship

The act of creating, designing, and running a new business, often characterized by innovation and risk-taking.

Positive Reinforcement

A technique used to encourage desired behaviors by offering rewards or positive outcomes when those behaviors are exhibited.