Heart murmur. Heart murmurs are heart sounds produced when blood flows across one of the heart valves that are loud enough to be heard with a stethoscope. There are two types of murmurs. A functional murmur or physiologic murmur is a heart murmur that is primarily due to physiologic conditions outside the heart. Other types of murmurs are due to structural defects in the heart itself.
Voyager 2 passed Neptune in the summer of 1989, the first spacecraft to observe that planet. Passing about 3,000 miles above Neptune's north pole, Voyager 2 made its closest approach to any planet since it left Earth 12 years earlier.
Bottom line: On August 22, 1989, while still a few days out from its closest approach to Neptune, the Voyager 2 spacecraft made the definitive discovery of rings for this outer planet. In August 2014, a new map from Voyagerâs 1989 flyby of Neptune gives us a glimpse of an unseen world