Physics
Planets are

luminous heavenly bodies that twinkle
luminous heavenly bodies revolving around a star
non-luminous heavenly bodies
luminous heavenly bodies that do not twinkle

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Physics
Conservation of energy refers to the fact that

If you conserve energy you will not be as tired
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another

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