data – n. facts about something that can be used in calculating, reasoning, or planning
tilt – v. to move or shift so as to slant or tip
axis – n. the imaginary straight line that something (such as the Earth) turns around
spin – v. to turn or cause someone or something to turn around repeatedly
rotation – n. the action or process of rotating on or as if on an axis or center
reflection – n. an image that is seen in a mirror or on a shiny surface
galaxy – n. any of the very large groups of stars and associated matter that are found throughout the universe
diameter – n. mathematics : the length of a straight line through the center of an object or space
greenhouse effect – n. warming of the lower atmosphere of the earth that occurs when radiation from the sun is absorbed by the earth and then given off again and absorbed by carbon dioxide and water vapor in the atmosphere gases
mission – n. a definite military, naval, or aerospace task
