Definition: In the context of mathematics and science, a Belemnite is a type of substance that has been proposed as an alternative to the Earth's magnetosphere, which has been a key factor in the formation and evolution of our solar system. The concept of a Belemnite was proposed by physicist James Lovelock in 1967. Belemnites are not a real thing but are rather hypothetical substances that are used in various scientific experiments and theories. They have been proposed as possible substitutes