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 officially discovered by Sir William Herschel in 1781: It is too dim to have been seen by the ancients. At first Herschel thought it was a comet, but several years later it was confirmed as a planet.Herscal tried to have his discovery named âGeorgian Sidusâ after King George III.acts about Uranus. Uranus was officially discovered by Sir William Herschel in 1781: It is too dim to have been seen by the ancients. At first Herschel thought it was a comet, but several years later it was confirmed as a planet. Herscal tried to have his discovery named âGeorgian Sidusâ after King George III.