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.
To quote Buzz Lightyear: To infinity and beyond!. That very well could be Voyager 1's motto. NASA scientists confirmed today that the Voyager 1 space probe has become the first human-made object to leave the solar system and venture into interstellar space. Voyager 1's precise location has been one of the most hotly debated scientific topics of the past year.