It is a fundamental amount of physics and therefore astronomy that is usually defined as the ability of a system to develop a job; for example the ability to move an object by means of a force.

Matter has energy as a result of its movement or its position in relation to the forces acting on it. Electromagnetic radiation has energy that depends on its frequency and, therefore, its wavelength. This energy is communicated to matter when it absorbs radiation and is received from matter when it emits radiation. The energy associated with movement is known as kinetic energy, while that related to position is potential energy.

Energy manifests itself in various forms, including mechanical, thermal, chemical, electrical, radiant or atomic energy. All forms of energy can be converted into other forms by appropriate processes. A form of energy can be lost or gained in the transformation process, but the total sum remains constant.

The observations of the 19th century led to the conclusion that although energy can be transformed it cannot be created or destroyed. This concept, known as the principle of conservation of energy, constitutes one of the basic principles of classical mechanics. Like the principle of conservation of matter, it is only fulfilled in phenomena that involve low speeds compared to the speed of light. When speeds begin to approximate that of light, as in nuclear reactions, matter can be transformed into energy and vice versa. In modern physics both concepts are unified, the conservation of energy and mass.

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