Star: a large, hot ball of gases, which is held together by gravity and gives off its own light.
Black hole: an object whoos gravity is so strong that light can not escape it.
Parallax: the apparent shift in an object´s location when viewed from two positions.
Light year: the distance light trvels in a year.
Constelletion: a number of stars that appear to form a pattern.
Magnitude: the brightness of a star.
Nebula: a cloud of gases and dust in space.
Super nova: a star that explodes.
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