Physics
Planets are

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

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Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity

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