The feature shown in the image below is a(n) ________, the largest one of its kind in the Solar System, and is located on the planet ________. 
Definitions:
Ventricles
Chambers of the heart that receive blood from the atria and pump it out of the heart to the lungs and the rest of the body.
Aortic Semilunar Valve
A valve in the heart located between the left ventricle and the aorta, preventing blood from flowing back into the heart.
Heart Sound
Sounds produced by the closing of heart valves during the cardiac cycle; typically described as a "lub-dub" sound.
Heart Murmur
An unusual or abnormal sound heard between heartbeats, which can be innocent or indicate a heart problem.
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