Star: a large, hot ball of gases, which is held together by gravity and gives off its own light.
Parallax: the apparent shift in an object's location when viewed from two positions.
Light-year: the distance light travels in a year.
Constellation: a number of stars that appears to form a pattern.
Magnitude: the brightness of a star.
Nebula: a cloud of gas and dust in space.
Supernova: a star that explodes.
Black hole: an object whose gravity is so strong that light cannot escape it.
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