Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume

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Physics
Planets are

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

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