The immediate cause of sudden cardiac arrest is usually an abnormality in your heart rhythm (arrhythmia), the result of a problem with your heart's electrical system.
Version for printing. The first planet to be discovered was Uranus by William and Caroline Herschel on 13 March 1781. It was discovered by the fact that it showed a disk when viewed through even a fairly low powered telescope. The only other planets which have been discovered are Neptune and Pluto.
Leverrier actually wanted to name it after himself. However, the name Neptune was proposed and became the standard used by scientists. Pluto (now a dwarf planet) was discovered in 1930 by Clyde Tombaugh at Lowell Observatory in Flagstaff, Arizona. According to the Nine Planets Website, other names suggested for Pluto included Lowell, Atlas, Artemis, Perseus, Vulan, Tantalus, Idana, Cronus, Zymal and Minerva (suggested by the New York Times).