NASA has released an image taken by the Hubble space telescope of a cluster of stars known as NGC-121, in one of our neighboring galaxies. ESA/Hubble/NASA. Saturn's largest and second largest moons, Titan and Rhea, appear to be stacked on top of each other in this true-color scene from NASA's Cassini spacecraft.
An enlarged left ventricle of the heart can be the result of heart muscle disease caused by medication, drugs, alcohol, idiopathic (cause unknown).
Other causes of first-degree heart block include: 1  myocarditis â inflammation of the heart muscle. 2  low levels of potassium in the blood (hypokalaemia)  low levels of magnesium in the blood (hypomagnesemia)