Suppose That,at the Same Time on the Same Night,we See

question 298

Multiple Choice

Suppose that,at the same time on the same night,we see two supernovas (exploding stars) explode in the night sky.If one is in the Andromeda Galaxy,2 million light-years away from us,and the other is in the galaxy M82,6 million light-years away from us,which of the following statements concerning the actual explosion times of these supernovas is CORRECT?

• A) We cannot tell which star actually exploded first because both stars are so far away.
• B) The supernova in the Andromeda Galaxy actually occurred after the one in M82.
• C) We know both stars exploded at the same time because we saw the explosions at the same time.
• D) The supernova in the Andromeda Galaxy actually occurred before the one in M82.

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Definitions:

Intercostal Space

An anatomical term referring to the space located between two ribs, through which nerves and blood vessels run.

Midclavicular Line

An imaginary vertical line passing through the midpoint of the clavicle in each half of the human body.

Thrill

A vibration felt on palpation, such as over an area of turbulent blood flow in an artery or a heart valve, indicative of certain types of cardiovascular abnormalities.

Cross-Eyed

A condition where the eyes do not properly align with each other when looking at an object, also known as strabismus.