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.
Uranus was discovered in 1781 by William Herschel while he was conducting a telescopic survey of the heavens. To date, some books and periodicals still refer to Uranus as Herschel. This was the beginning of the machine age. Uranus rules machinery, particularly advanced machinery such as computers.