Which one is the definition of planets?

Which one is the definition of planets?

1. luminous heavenly bodies revolving around a star

2. non-luminous heavenly bodies

3. luminous heavenly bodies that twinkle

4. luminous heavenly bodies that do not twinkle

Correct Option: Option B,

non-luminous heavenly bodies

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A planet is an astronomical body orbiting a star or stellar remnant that. is massive enough to be rounded by its own gravity,; is not massive enough to cause thermonuclear fusion, and; has cleared its neighbouring region of planetesimals.