Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them

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Physics
Planets are

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

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