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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.
Red Gaint
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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.
Nuclear Fusion
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Is a reaction in which a large nuclei breaks apart into two smaller nuclei, releasing a great deal of energy.
Nuclear Fission
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A cloud of gas (hydrogen) and dust in space that are the birthplaces of stars.
Nebula
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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.
Red Dwarf
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A very small, hot star, the last stage in the cycle of a star.
White Dwarf
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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.
Supernova
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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
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Emitting light
Luminosity
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A unit of distance equal to the distance that light travels in a vacuum in one year, c. 9,460,000,000,000 km.
Light Year
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Stored energy, is the ability of a systen to do work due to its position or internal structure.
Potential Energy
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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.
Kinetic Energy
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Free descent of a body in which the gravitational force is the only force acting on it.
Free Fall
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A force that resists the relative motion or tendency to such a motion of two bodies or substances in contact
Friction
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The tendency of a body to preserve its state of rest or uniform motion unless acted upon by an external force.
Inertia
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