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
Why does the sea appear blue in colour?

Interference of the sun light from water surface
Reflection of the sun light from water surface
Refraction of the sun light
Scattering of the sunlight by water molecules

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