Ketu is the descending lunar node in Vedic or Hindu astrology. After the head of Svarbhānu, an Asura was cut off by God Vishnu, his head and body joined with a snake to form 'Ketu', representing the body without a head, and Rahu, representing the head without a body. According to some accounts in Hindu mythology, Ketu belongs to Jaimini Gotra, whereas Rahu is from Paiteenasa gotra and hence both are totally different entities with distinct characteristics and not two parts of a common body. Ketu is generally referred to as a "shadow" planet. It is believed to have a tremendous impact on human lives and also the whole creation. In some special circumstances, it helps someone achieve the zenith of fame. Ketu is often depicted with a gem or star on his head signifying a mystery light.