Earth Has Been Sending Out Radio Messages for About 120

question 45

Multiple Choice

Earth has been sending out radio messages for about 120 years, so detection equipment on a hypothetical planet 120 light-years away might just now begin receiving them. What is the parallax angle subtended by a system at this distance? Can astronomers detect such a parallax angle with existing technology?

• A) 0.0026 arcseconds; no
• B) 0.0084 arcseconds; yes
• C) 0.027 arcseconds; yes
• D) 120 arcseconds; yes

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Definitions:

Ethics

A branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong behavior, focusing on the morality of actions, duties, rights, and the goodness of characters.

Causality

The relationship between cause and effect, where one event (the cause) leads to the outcome of another event (the effect).

Concrete Level

Describes a stage of analysis or understanding that deals with tangible, definite, and specific instances as opposed to abstract or theoretical concepts.

Abstract Level

a degree of thinking that involves complex, non-concrete concepts that do not rely on sensory experience for understanding.