The Star Alpha Proxima Centauri, the Nearest Star Beyond the Sun

question 204

Multiple Choice

The star alpha Proxima Centauri, the nearest star beyond the Sun, is 22 km closer to the Sun every second. This motion of alpha Proxima Centauri toward the Sun is an example of

• A) radial velocity.
• B) precession.
• C) elongation.
• D) proper motion.

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Definitions:

Ex Post Facto Design

A research approach that examines the effects of an independent variable on a dependent variable after the events have occurred.

Focus Groups

Structured group discussions used to gather participants' attitudes, feelings, beliefs, and reactions to a specific subject or area of interest.

Experiments

Research procedures carried out under controlled conditions and based on the technique of manipulating one or more variables in hopes of observing an effect. Typically, an experimental condition is applied to one group, and the results are compared with those from another group (control group) that has had no experimental treatment.

Operationalization

The process of defining a fuzzy concept so as to make the concept measurable and to understand it in terms of empirical observations.