Physics
Planets are

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

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Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Magnetic disturbances in the atmosphere
Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere

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