Which of the Following Must Be Measured in Order to Determine

question 22

Multiple Choice

Which of the following must be measured in order to determine a star's proper motion?

• A) angular position at multiple times
• B) mass
• C) redshift or blueshift
• D) radius

---

Definitions:

Unwanted Contact

Interactions or communications that are undesired or uninvited, potentially causing discomfort or distress to the recipient.

Collectives

Groups or aggregates of people or items that share common features or are considered together.

Proximity

The physical or psychological closeness between people, which can influence attraction and relationship formation.

Circular Reactions

Repetitive actions observed in developmental psychology, especially in infants, where a particular action leads to a result that encourages the infant to repeat the action.