By Andrew Zimmerman Jones. Definition: Dark matter is a hypothesized form of matter particle that does not reflect or emit electromagnetic radiation. The existence of dark matter is inferred from gravitational effects on visible matter, such as stars and galaxies.
An enlarged heart is medically known as cardiomegaly. Cardiomegaly can be caused by a number of different conditions, including diseases of the heart muscle or heart valves, high blood pressure, arrhythmias, and pulmonary hypertension.t is important to remember that an enlarged heart is not a disease itself but a physical sign that can accompany many diseases and conditions. Not all of the associated conditions listed below, however, will always result in cardiomegaly. Treatment and prognosis are dependent upon the underlying cause.
Enlarged aorta is the abnormal widening of the largest artery of the heart which is the aorta carrying oxygen that supplies to all parts of the human body.This is considered as a serious condition related to the heart. Atherosclerosis â it is known as the hardening of the arteries of the heart. 2  This is the most common cause of enlarged aorta for it will damage mainly the arteries. 3  Injury â sudden force applied which can damage the arteries in specified body parts like the chest and abdomen such as a vehicle accident.