The passage describes the evolution of a star with a mass that is much larger than the mass of the Sun. Use words or phrases from the box to complete the passage. Each word or phrase may be used once, more than once, or not at all. chemical contract expand gravitational kinetic main sequence neutron star nuclear protostar supernova vibrate white dwarf Hydrogen atoms in a nebula move towards each other due to the force of gravity. As the atoms move towards each other, their energy store increases, which increases the temperature. If the temperature becomes high enough, nuclear fusion of hydrogen will start and the star enters the stage of its evolution. When hydrogen fusion stops in the core of the star, the core of the star will start to This increases the temperature in a layer surrounding the core. Hydrogen fusion restarts in a layer surrounding the core. This causes the star to and its surface temperature decreases. The star is now a red super giant. Eventually nuclear fusion stops in the core of the star and the star explodes as a The core of the star collapses to form either a or a black hole.
Physics
