What Is an Astronomical Unit

question 105

Multiple Choice

What is an astronomical unit?

• A)the average speed of Earth around the Sun
• B)the length of time it takes Earth to revolve around the Sun
• C)the average distance from Earth to the Sun
• D)the diameter of Earth's orbit around the Sun
• E)any basic unit used in astronomy

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Definitions:

Electroencephalograph

A device used to record the electrical activity of the brain, commonly known as an EEG.

EKG

An abbreviation for electrocardiogram, a test that measures the electrical activity of the heart to detect and diagnose various heart conditions.

Positron Emission Tomography

A nuclear medicine functional imaging technique used to observe metabolic processes in the body.

Computerised Tomography

A diagnostic imaging technique that uses computer-processed combinations of multiple X-ray measurements taken from different angles to produce cross-sectional images of specific areas of a scanned object.