Big Bang nucleosynthesis is a process of forming matter nucleus during Big Bang . It was thought that before Big Bang there was a hot and dense state in universe. Basically, it was a state of energy with no existence of matter. After three minute of Big Bang first nucleus of universe is formed. During Big Bang sudden and rapid cooling of hot and dense state of energy formed first nucleus of universe. The entire process of forming nucleus is called Big Bang Nucleosynthesis.
Gravitational lens Gravitational lensing can be define as a phenomenon that is exactly a distribution of matter between distant light and observer. Gravitational lens can bend light coming from light source to the observer. The effect of gravitation is known as gravitational lensing. With the effect of gravitational lensing, what amount of the light will be bend is predicted by the general theory of relativity
Electromagnetic field is a physical field that caused by interaction of electrically charged object. It is one of the four fundamental force in nature that can indefinitely expanse in space. The other fundamental interaction in nature other than electromagnetic field is strong interaction, weak interaction and gravitation . Electromagnetic field is the combination of electric field and magnetic field. Electric field is produces through stationary charge and magnetic field is produces by moving charges. Maxwell equation and Lorentz Force law explains how electric field and magnetic field interact to produces electromagnetic field. Though, according to quantum field theory, field is seen as a quantized, electromagnetic field is continuous and propagate in smooth manner. Read more in bellow link Electromagnetic force http://zipansion.com/2bpC1 Electromagnetic radiation http://zipansion.com/2Nbk8 Electromagnetic field http://zipansion.com/2bp6i
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