Is a very bright star towards the end of its life, the temperature near the core rises and this causes the size of the star to expand and the surface is cool.
Is a reaction between two nuclei that combine together to form a heavier nuclei. The sun shines thanks to fusion reactions that turn hydrogen nuclei into helium.
Is a reaction in which a large nuclei breaks apart into two smaller nuclei, releasing a great deal of energy.
A cloud of gas (hydrogen) and dust in space that are the birthplaces of stars.
Very cool, faint and small stars, approximately one tenth the mass and diameter of the Sun. They burn very slowly and have estimated lifetimes of 100 billions years.
A very small, hot star, the last stage in the cycle of a star.
This is the explosive death of a star, and often results in the star obtaining the brightness of 100 million suns for a short time.
Stars live out the majority of their lives in this phase. Once achieving nuclear fission, stars radiate (shine) energy space. The star slowly contracts over billions of years to compensate for the heat and light energy loss.
Main Sequence Star
A unit of distance equal to the distance that light travels in a vacuum in one year, c. 9,460,000,000,000 km.
Stored energy, is the ability of a systen to do work due to its position or internal structure.
The energy possessed by a body because of its motion, equal to one half the mass of the body times the square of its speed.
Free descent of a body in which the gravitational force is the only force acting on it.
A force that resists the relative motion or tendency to such a motion of two bodies or substances in contact
The tendency of a body to preserve its state of rest or uniform motion unless acted upon by an external force.