Neutron Star, Extremely dense star made up of tightly packed neutrons that spin rapidly and emit high frequency radio waves, Parallax, Apparent change in the position of an object as viewed from two different locations that are not in line with the object, Protostar, Pre-luminous star; massive concentration of gas and dust which will become a luminous star after the nebula collapses, Solar Mass, Mass of a star relative to the Sun (e.g., Sun is 1 solar mass and a bigger star has a solar mass >1), Universe, Everything that exists including matter, energy and space, Red Giant, Star near the end of its life cycle with a solar mass 10X greater than the Sun; it is cool and running out of hydrogen fuel, White Dwarf, Small, hot and dim star created by the remnant core left over after a Red Giant star dies, Supernova, Stellar explosion that occurs at the end of a massive star's life, Black Hole, Extremely dense quantity of matter in space from which no light or matter can escape, Luminosity, Total amount of energy produced by a star each second; amount of light emitted from a star's surface, Apparent Magnitude, Brightness of a star in the night sky as it appears from Earth (i.e., close star looks bright), Absolute Magnitude, Brightness of a stars as if all stars were theoretically located 33 light years from Earth (...so far away stars that may be bright are brought to a same relative measuring point so their true brightness shows)c, Astronomical Unit (AU), About 150 000 000 km; average distance from the Earth to the Sun, Light Year (LY), Distance that light travels in one year (9.46 X 10^12 km); LY is a distance. LY is not a measure of time., Big Bang Theory, Theory that the Universe evolved from an incredible hot and dense expansion of a singularity about 13.7 billion years ago, Nuclear Fusion, Nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with a release of energy, Full Moon, Phase of the moon when the full disk is illuminated and visible; Illuminated face of the moon is facing Earth, New Moon, Phase of the moon when the moon is invisible from Earth; Illuminated face of the moon is NOT facing Earth.

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