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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