Creatinine is a toxin produced during the metabolism of meat in our body. Therefore, people with lots of muscles or who eat lots of meat always have a relatively high creatinine level, but it usually fluctuates in the normal range: 0.5-1.3mg/dL.
comet definition An object that enters the inner solar system, typically in a very elongated orbit around the sun. Material is boiled off from the comet by the heat of the sun, so that a characteristic tail is formed.
A comet's orbit showing the different directions of the gas and dust tails as the comet passes the Sun. In the outer Solar System, comets remain frozen and are extremely difficult or impossible to detect from Earth due to their small size.