It took centuries to grasp the idea of chemical elements as being the bricks of the universe and that out of these building stones all matter is composed. Number of Elements.—From many facts it ...
These elements, which are the constituents of immense ... unless they are restrained by chemical combination. They then collect around the great centers of attraction constituted by the stars ...
During the course of Syria’s brutal civil war, Assad used chemical weapons more than 300 times against his own citizens, causing thousands of casualties. The worst such attack was a barrage of ...
In this video, Professor Brian Cox demonstrates how chemical elements are made when a star dies. Gravity and nuclear fusion reactions drive the formation and development of stars. Stars with ...